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Interface modification of perovskite solar cell for synergistic effect of surface defect passivation and excited state property enhancement

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JOURNAL OF ALLOYS AND COMPOUNDS 2023年第1期960卷

作者： Park, Hansol Heo, Jihyeon Jeong, Bum Ho Lee, Sewook Lee, Kyu-Tae Park, Sanghyuk Park, Hui Joon Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Inha Univ Dept Phys Incheon 22212 South Korea Kongju Natl Univ Dept Chem Kong Ju 32588 South Korea Hanyang Univ Hanyang Inst Smart Semicond Seoul 04763 South Korea

The efficiency of perovskite solar cell (PSC) is significantly affected by the charge transport and re-combination behaviors at the interfaces between the perovskite photoactive layer and charge transport intermediate layers. Especially, the defects, existing in those interfaces, induce non-radiative charge carrier recombination, reducing the stability of the device along with its performance. In this work, we newly design an imidazole-and methoxy-functionalized triphenylamine based hole-transport material (HTM), which has defect-passivating functionality together with proper carrier-transportation property, for the p-i-n PSC devices. Additionally, it is also designed to preserve its enhanced molecular dipole moment at the excited-state with longer lifetime through excited-state intramolecular proton transfer (ESIPT) process, consequently beneficial to improve the Vbi of the device. The designed HTM molecule, having a synergistic effect of defect-passivation and photo-enhanced dipole characteristic, is confirmed to be advantageous to produce PSCs with higher performance and stability. (c) 2023 Elsevier B.V. All rights reserved.

关键词： Perovskite photovoltaics Hole-transport materials Defect-passivation ESIPT Excited state dipole moment

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Elucidation and modulation of active sites in holey graphene electrocatalysts for H2O2 production

ECOMAT

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ECOMAT 2023年第1期5卷

作者： Koh, Ki Hwan Mostaghimi, Amir Hassan Bagherzadeh Chang, Qiaowan Kim, Yu Joong Siahrostami, Samira Han, Tae Hee Chen, Zheng Univ Calif San Diego Dept Nano Engn San Diego CA 92103 USA Hanyang Univ Dept Organ & Nanoengn Human Tech Convergence Program Seoul 04763 South Korea Univ Calgary Dept Chem 2500 Univ Dr NW Calgary AB Canada Univ Calif San Diego Program Chem Engn Sustainable Power & Energy Ctr SPEC San Diego CA 92103 USA

Selective electrochemical oxygen reduction (ORR) toward a two-electron (2e(-)) pathway is an eco-friendly alternative method for H2O2 synthesis to replace the energy-intensive anthraquinone oxidation process. Carbon-based electrocatalysts (CBEs) show great potential for practical H2O2 synthesis. However, their complex structures make it challenging to determine the nature of active sites and to precisely control them. Herein, we show that precise modulation of the chemistry and structures of holey graphene with edge sites enriched by oxygen-containing functional groups can facilitate 2e(-) ORR. These combined functionalities could improve ORR performance under various pH conditions, for example, resulting in an average of 95% H2O2 selectivity, similar to 97% Faraday efficiency, high productivity of 2360 mol kg(cat)(-1) h(-1) in alkaline media. Density functional theory calculations on the oxygen functional groups at the edge sites revealed the most active site for 2e(-) ORR is a synergy between ether (C-O-C) and carbonyl (C=O) functional groups with nearly zero overpotential.

关键词： electrocatalyst graphene hydrogen peroxide oxygen reduction reaction

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Magnetomechanical Transport of Liquid Metal Droplets via Asymmetric Microwall Arrays

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ADVANCED MATERIALS INTERFACES 2023年第1期10卷

作者： Jhang, Saebohm Park, Jeong Eun Jeon, Jisoo Tabor, Christopher E. E. Wie, Jeong Jae Inha Univ Dept Polymer Sci & Engn Program Environm & Polymer Engn Incheon 22212 South Korea Hanyang Univ Res Inst Ind Sci Seoul 04763 South Korea Inha Univ Program Environm & Polymer Engn Incheon 22212 South Korea Air Force Res Lab Mat & Mfg Directorate Wright Patterson Afb OH 45433 USA Hanyang Univ Inst Nano Sci & Technol Dept Organ & Nano Engn Dept Chem EngnHuman Tech Convergence Program Seoul 04763 South Korea

Eutectic gallium indium liquid metal (LM) is a promising conductive liquid for various electronic applications. In particular, the directional transport of LM droplets has potential applications in soft electronics to control electrical conductivity. Existing methods transport LM droplets by applying an electric field to generate an interfacial tension difference within the LM droplet due to nonuniform ionic distribution of the electrical double layer. However, these methods require confined channels and tethered systems to apply the electric field. In this study, channel-free wireless transport of LM droplets is demonstrated via on-demand magnetomechanical actuation of asymmetric microwall arrays comprising vertically aligned ferromagnetic iron particles embedded in polydimethylsiloxane. Asymmetric microwall of two different widths is designed to generate an asymmetric bending stiffness at a given magnetic field. The asymmetric microwall bends gradually in response to a linear external magnetic field perpendicular to the alignment axis of the iron particles. Therefore, nonuniform magnetomechanical bending induces a local height gradient along the microwall, causing gravitational-force-driven roll-off motion of the LM droplet. Transport direction of LM droplet is modulated by varying the geometric parameters. Finally, the opposite-directional transport of two LM droplets is demonstrated under a linear magnetic field by pre-programming the asymmetric bending direction of each microwall array.

关键词： EGaIn liquid metal magnetic composites microarray polydimethylsiloxane

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Organic X-Ray Image Sensors Using a Medium Bandgap Polymer Donor with Low Dark Current

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Energy & Environmental Materials 2024年第6期7卷 230-237页

作者： Jong-Woon Ha Seung Hun Eom Bo Kyung Cha Seyeong Song Hyeong Ju Eun Jong H.Kim Jong Mok Park BongSoo Kim Byoungwook Park Seo-Jin Ko Sung Cheol Yoon Changjin Lee In Hwan Jung Do-Hoon Hwang Department of Chemistry Chemistry Institute for Functional MaterialsPusan National UniversityBusan 46241Korea Division of Advanced Energy Materials Research Center Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Korea Electro-Medical Device Research Center Korea Electrotechnology Research Institute(KERI)Ansan 15588Korea Graduate School of Carbon Neutrality School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Molecular Science and Technology Ajou UniversitySuwon 16449Korea Research Center for Advanced Specialty Chemicals Korea Research Institute of Chemical TechnologyUlsan 44412Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Organic and Nano Engineering Human-Tech Convergence ProgramHanyang University222 Wangsimni-roSeongdong-guSeoul 04763Korea

The development of portable X-ray detectors is necessary for diagnosing fractures in unconscious patients in emergency ***,this is quite challenging because of the heavy weight of the scintillator and silicon *** weight and thickness of X-ray detectors can be reduced by replacing the silicon layer with an organic *** study presents a novel bithienopyrroledione-based polymer donor that exhibits excellent photodetection properties even in a thick photoactive layer(~700 nm),owing to the symmetric backbone and highly soluble molecular structure of *** ability of bithienopyrroledione-based polymer donor to strongly suppress the dark current density(Jd~10−10 A cm^(−2))at a negative bias(−2.0 V)while maintaining high responsivity(R=0.29 A W−1)even at a thickness of 700 nm results in a maximum shot-noise-limited specific detectivity of D_(sh)^(*)=2.18×10^(13)Jones in the organic *** organic photodetectors are developed by slot-die coating for use in X-ray detectors,which exhibit D_(sh)^(*)=2.73×10^(12)Jones with clear rising(0.26 s)and falling(0.29 s)response times upon X-ray *** reliability is also proven by linear response of the X-ray detector,and the X-ray detection limit is 3 mA.

关键词： low dark current low detection limit organic photodetector printable X-ray

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Intense pulsed light-induced millisecond selective heat treatment for high-performance silicon anodes

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CHEMICAL ENGINEERING JOURNAL 2024年 498卷

作者： Park, Changyong Kim, Sucheol Lee, Hojae Park, Jong-Whi Choi, Minwoo Do, Kwanghyun Song, Chiho Kim, Hak-Sung Kim, Young-Beom Rhee, Junki Bansal, Neetu Salunkhe, Rahul R. Ahn, Heejoon Hanyang Univ Dept Organ & Nano Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Dept Mech Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Dept Battery Engn 222 Wangsimni Ro Seoul 04763 South Korea Hyundai Motors Grp Res & Dev Div Battery Cell Dev Team 150 Hyundaiyeonguso Ro Hwaseong Si 18280 Gyeonggi Do South Korea Indian Inst Technol Jammu Dept Phys Jagti 181221 Jammu And Kashm India

Silicon, which is gaining prominence as a potential anode material, exhibits long-term cycle stability issues owing to volume changes during cycling. This study presents a meticulously designed Si anode that employs intense pulsed light (IPL) technology to simultaneously reduce carbon additives and construct an effective carbon quantum dot (CQD)-derived binder system. IPL, as a light-material interaction technique, offers a novel approach for selective heat treatment with remarkably short processing durations on the order of milliseconds. By comprehensively considering the geometric structure, optical characteristics, and thermal properties of each electrode component, heat transfer bridge (HTB) materials are introduced to ensure a homogeneous depthdirectional heat treatment and to minimize binder decomposition in the IPL process. By employing HTB materials, the binder can reach a controlled target temperature for the condensation reaction between poly (acrylic acid) and the CQDs. Simultaneously, higher heat generation in the conductive carbon than in the binder leads to selective additional carbon reduction. This unique approach provides selective heat treatment, which cannot be achieved using conventional methods, resulting in a Si anode with excellent cyclic stability and rate capability. The versatility of the IPL technology is further demonstrated by applying it to relatively inexpensive Si microparticles.

关键词： Silicon anodes Lithium-ion batteries Energy storage Intense pulsed light Selective heat treatments Carbon quantum dots

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BaTiO3@PVDF-TrFE nanocomposites with efficient orientation prepared via phase separation nano-coating method for piezoelectric performance improvement and application to 3D-PENG

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CHEMICAL ENGINEERING JOURNAL 2022年 427卷 131030-131030页

作者： Cho, Yujang Jeong, Jaeseon Choi, Minseok Baek, Gyunpyo Park, Sangki Choi, Hyeongsub Ahn, Seongcheol Cha, Seokjun Kim, Taeyun Kang, Dong-Soo Bae, Jihyun Park, Jong-Jin Chonnam Natl Univ Dept Sci & Polymer Engn Gwangju 61186 South Korea Hanyang Univ Arkema Seoul Technol Ctr Fus Technol Ctr 7F 222 Wangsimni RoSeongdong Gu SEOUL 04763 South Korea Hanyang Univ Human Tech Convergence Program SEOUL 04763 South Korea Hanyang Univ Dept Clothing & Text SEOUL 133791 South Korea

Piezoelectric organic-inorganic hybrid nanocomposites utilize the advantages of high piezoelectricity of piezoelectric ceramics as well as the dielectric properties and flexibility of polymers. BaTiO3 particles that are nanocoated using the phase separation nano-coating method have effective orientation due to interaction with the PVDF-TrFE polymer chain. After mixing the piezoelectric BaTiO3 nanoparticles with the PVDF-TrFE matrix, an organic-inorganic hybrid nanocomposite film with enhanced efficiency characteristics of inorganic piezoelectric particles, and the flexibility and processability of the polymer was fabricated. The piezoelectric organic-inorganic hybrid nanocomposite film, in which the BaTiO3 coated with a polymer layer of about 5 nm or less, was dispersed and produced an output voltage of 59.5 V and an output current of 6.52 mu A at a relatively low compression pressure of 100 N and frequency of 2.5 Hz. The result was about 4.8 times and 2 times higher than that of pure PVDF-TrFE and BaTiO3 nanocomposite dispersed films, respectively. The output power was measured against the external load resistance. On the other hand, the maximum output power value was measured to be 165.8 mu W. In addition, by using the excellent pmcessability of the uniformly dispersed BaTiO3@PVDF-TrFE nanocomposite solution, the piezoelectric nano-generator was implemented in a new form, in which the existing form factor was changed by coating on a three-dimensional shape as well as a two-dimensional flat film.

关键词： Piezoelectric nanogenerator (PENG) Nano coating Organic-Inorganic hybrid nanocomposite 3D structure PENG

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Enhancement of Interfacial Properties by Indoloquinoxaline-Based Small Molecules for Highly Efficient Wide-Bandgap Perovskite Solar Cells

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ADVANCED FUNCTIONAL MATERIALS 2024年第14期34卷 2312505-2312505页

作者： Yong, Jihye Lee, Yu Kyung Park, Hansol Muthu, Senthilkumar Shin, Juhwan Whang, Dong Ryeol Kim, Bong-Gi Chang, Dong Wook Park, Hui Joon Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Pukyong Natl Univ Dept Ind Chem Busan 48513 South Korea Hannam Univ Div Adv Mat Daejeon 34054 South Korea Konkuk Univ Dept Organ & Nano Syst Engn Seoul 05029 South Korea

Interfacial engineering in organic-inorganic hybrid perovskite solar cells (PSCs) has attracted significant attention, aiming to achieve high-performing and highly stable devices. Here, newly designed organic small molecules based on quinoxaline and triphenylamine for inverted type wide-bandgap PSCs are introduced, with the objective of enhancing the interfacial properties between perovskite and NiOx hole transport layer (HTL). The incorporation of an organic interlayer effectively reduces the energy level offset between the HTL and wide-bandgap perovskite, while passivating defects within the perovskite layer. It leads to improved charge extraction and minimized non-radiative recombination at the interface. Furthermore, the enhanced interfacial characteristics and hydrophobicity contribute to the improvement of perovskite film quality, resulting in larger grain size and higher crystallinity. As a result, the power conversion efficiency (PCE) of the PSC is enhanced from 18.9% to 20.1% with the incorporation of the IQTPAFlu interlayer, accompanied by an increase in Voc to approximate to 1.3 V, achieving a significantly low Voc deficit of 0.46 V. And the IQTPAFlu-based devices demonstrate stable and consistent performance over 500 h, with approximate to 91% of their initial PCE retained. The highly stable wide-bandgap PSCs, characterized by high Voc and PCEs, hold great promise as potential candidates for tandem solar cells. Quinoxaline and triphenylamine-based organic small molecules are designed to enhance the interfacial properties between the perovskite and the NiOx hole transport layer in inverted-type wide-bandgap perovskite solar cells (PSCs). The integration of these organic interlayers effectively mitigates the energy level offset, passivates defects, and enhances the quality of the perovskite film. This improvement results in an outstanding efficiency of 20.1% for a 1.75 eV wide-bandgap ***

关键词： defect-passivation interlayer organic hole transport material perovskite solar cell wide-bandgap

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Effect of metal/metal oxide catalysts on graphene fiber for improved NO2 sensing

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SENSORS AND ACTUATORS B-CHEMICAL 2021年 344卷 130231-130231页

作者： Eom, Wonsik Jang, Ji-Soo Lee, Sang Hoon Lee, Eunsong Jeong, Woojae Kim, Il-Doo Choi, Seon-Jin Han, Tae Hee Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Korea Adv Inst Sci & Technol Dept Mat Sci & Engn Daejeon 34141 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Hanyang Univ Div Mat Sci & Engn Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol Seoul 04763 South Korea

Noble metal/metal-oxide-based hybrid gas sensors exhibit a low operating temperature, remarkable sensitivity, and fast recovery. As additives, noble metals induce a catalytic sensitization effect, which promotes charge transfer from the metal oxide to the analyte molecules, the so-called spillover mechanism. This suggests that metal catalysts can improve gas sensing performance. Herein, for the first time, non-noble metals are introduced on hybrid metal oxide/graphene fibers as sensitizers to fabricate high-performance chemiresistive sensors. The formation of metal components can be effectively controlled by annealing the metal oxide on graphene. Remarkably, compared with the corresponding metal oxide/graphene fiber sensors without metal components, the metal/metal oxide/graphene fiber sensors exhibit over a 16-fold higher response to NO2 gas as well as effective recovery characteristics. Specifically, the Cu/Cu2O/graphene and Ni/NiO/graphene fiber sensors operating at 150 degrees C exhibit sensitivities of 18.90 % and 0.82 %, respectively, for 5 ppm NO2 gas. The proposed strategy to achieve flexible graphene fiber chemiresistors by decorating them with non-noble metal and metal oxide nanoparticles opens a new avenue for realizing high-performance devices, such as photovoltaic devices, photocatalysts, and chemical catalysts.

关键词： Graphene fibers Gas sensors Sensitization Non-noble metals Catalytic deoxidation

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Peeling mechanism of interlocked interface between etched acrylonitrile-butadiene-styrene and electroplated metal layer

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SURFACES AND INTERFACES 2021年 26卷

作者： Seo, Jae Sik Jeon, Ho Tak Han, Tae Hee Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hyundai Motor Co Mat Dev Ctr Interior Syst Plast Mat Dev Team Hwaseong 18280 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Hanyang Univ Res Inst Ind Sci Seoul 04763 South Korea

Electroplating of metals on polymer materials is one of the best decorative processes for achieving low cost and light weight. However, low interfacial adhesion often limits practical utilization due to the potential peel-off behavior of metal layers. The interface between the metal layers and acrylonitrile-butadiene-styrene (ABS) substrate and its peeling mechanism are investigated as a function of etching time. S-a, the arithmetic average roughness of the unit area, and S-dr, the interfacial area ratio, are adopted instead of linear roughness, R-a, to quantify the surface profile. As the etching time increases, both S-a and S(dr )for the etched ABS and corresponding metal side increase. The failure mode changes from adhesive to cohesive as the etching time increases, and the peel-off strength of the electroplated ABS exhibits a dependence on the tensile strength of the substrate. The peeloff strength of the electroplated ABS specimens increases to 8.46 N/cm after 30 min of etching time, but the interface degrades, forming inner voids. The S-dr ratio (S-dr,S- polymer/ S-dr,S-plating) is proposed as a surface parameter to predict the peel-off strength of electroplated ABS and represents a new attempt to quantitatively correlate the interfacial morphology with the adhesion strength.

关键词： Electroplating ABS Etching Adhesion Surface profile

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Photo-Triggered Shape Reconfiguration in Stretchable Reduced Graphene Oxide-Patterned Azobenzene-Functionalized Liquid Crystalline Polymer Networks

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ADVANCED FUNCTIONAL MATERIALS 2021年第31期31卷 2102106-2102106页

作者： Cho, Woongbi Jeon, Jisoo Eom, Wonsik Lee, Jae Gyeong Kim, Dong-Gyun Kim, Yong Seok Han, Tae Hee Wie, Jeong Jae Inha Univ Dept Polymer Sci & Engn 100 Inha Ro Incheon 22212 South Korea Inha Univ Program Environm & Polymer Engn 100 Inha Ro Incheon 22212 South Korea Hanyang Univ Dept Organ & Nano Engn 222 Wangsimmni Ro Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program 222 Wangsimmni Ro Seoul 04763 South Korea Korea Res Inst Chem Technol Adv Mat Div 141 Gajeong Ro Daejeon 34114 South Korea

In recent years, the "Kirigami" have been exploited to engineer stretchable electronics that exhibit enhanced deformability without sacrificing their mechanical and electrical properties. However, kirigami-inspired engineering is often limited to passive mechanical stretching for 3D shape morphing. To counter this problem, in this study, azobenzene-functionalized liquid crystalline polymer networks (azo-LCNs) are monolithically integrated with patterned reduced graphene oxide (rGO), called azo-LCN/rGO, to achieve on-demand shape reconfiguration in response to external stimuli (UV, NIR, solar rays, and portable light);in addition, the azo-LCN/rGO exhibit highly enhanced mechanical and electrical properties. The cross-sectional area and thickness of rGO patterns are controlled using a masking technique and evaporative self-assembly. By the spatial patterning of rGO, insulating azo-LCNs are converted into electrically conducting structures (381.9 S cm(-1)). The elastic modulus of <2 mu m thick azo-LCN can be tailored in the range of 1.3-6.4 GPa by integration with rGO layers of thickness less than 2 mu m. Upon UV irradiation, azo-LCN/rGO exhibit both for/backward in-plane bending as well as out-of-plane chiral twisting, thus overcoming the typical trade-off relationship between elastic modulus and deformability. Finally, an on-demand contactless shape reconfiguration in azo-LCN/rGO by UV irradiation in conjunction with passive mechanical strain is demonstrated.

关键词： liquid crystalline polymer networks nanocomposites photomechanical actuations reduced graphene oxides stretchable electronics

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