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Layer-by-layer slot-die coated high-efficiency organic solar cells processed using twin boiling point solvents under ambient condition

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Nano Research 2021年第11期14卷 4236-4242页

作者： Yu Yang Erming Feng Hengyue Li Zichao Shen Wanrong Liu Jingbo Guo Qun Luo Jidong Zhang Guanghao Lu Changqi Ma Junliang Yang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha410083China Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’an710054China Printable Electronics Research Center Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou215123China Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchun130022China

Layer-by-layer (LbL) strategy has been developed to form bulk heterojunction (BHJ) structure for processing efficient organic solar cells (OSCs). Herein, LbL slot-die coating with twin boiling point solvents (TBPS) strategy was developed to fabricate highly efficient OSCs, which matches with large-scale, high throughput roll-to-roll (R2R) industrialized mass process. The TBPS strategy could produce high-quality thin film without any additive, leading to the optimized vertical phase separation with interpenetrating nanostructures, as well as the enhanced charge transport and extraction. Thus, the power conversion efficiency up to 14.42% was achieved for [(2,6-(4,8-bis(5-(2-ethylhexyl-3-fluoro)thiophen-2-yl)-benzo [1,2-b:4,5-b′]dithiophene))-alt-(5,5-(1′,3′-di-2-thienyl-5′,7′-bis(2-ethylhexyl)benzo[1′,2′-c:4′,5′-c′]dithiophene-4,8-dione)]:2,2′-((2Z,2′Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2″,3″:4″,5″]thieno[2′,3′:4,5]pyrrolo[3,2-g]thieno[2′,3′:4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene)) bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (PM6:Y6) OSCs fabricated via sequentially LbL slot-die coating using the TBPS strategy under ambient condition. The research provides a potential route for industrialized production of high-efficiency and large-area OSC devices.

关键词： organic solar cells slot-die coating twin boiling point solvent layer-by-layer(LbL) vertical phase separation

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A non-wetting and conductive polyethylene dioxothiophene hole transport layer for scalable and flexible perovskite solar cells

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Science China Chemistry 2021年第5期64卷 834-843页

作者： Chenxiang Gong Lin Zhang Xiangchuan Meng Zhi Xing Li Rao Hongyu Wang Zengqi Huang Licheng Tan Ting Hu Xiaotian Hu Yiwang Chen College of Chemistry Nanchang UniversityNanchang 330031China Institute of Polymers and Energy Chemistry Nanchang UniversityNanchang 330031China Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China School of Materials Science and Engineering Nanchang UniversityNanchang 330031China Institute of Advanced Scientific Research(iASR) Jiangxi Normal UniversityNanchang 330022China

The regulated crystallization of perovskite and highly repeatable preparation are decisive challenges for large-scale flexible perovskite solar cells(PSCs).Herein,we synthesize an oil-soluble poly(3,4-ethylenedioxythiophene)(Oil-PEDOT)as a hole transport layer(HTL).The non-wetting Oil-PEDOT HTL can promote the quality of large-area flexible perovskite films because of its optimized crystallinity and *** Oil-PEDOT layer also delivers desirable conductivity and charge transport without a complex ***,the flexible PSCs with Oil-PEDOT HTL achieve an efficiency of 19.51%and 16.70%based on 1.05 and 22.50 cm^(2),***,these large-scale flexible PSCs demonstrate remarkable mechanical robustness,and the efficiency exhibits 93%retention after 7,000 bending *** results show that the Oil-PEDOT is a potentially efficient HTL for fabricating efficient large-scale flexible PSCs.

关键词： non-wetting dopant-free hole transport layer flexible solar cells large-scale

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Controlled growth of transition metal dichalcogenide via ther-mogravimetric prediction of precursors vapor concentration

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Nano Research 2021年第8期14卷 2867-2874页

作者： Long Fang Shaohua Tao Zhenzhen Tian Kunwu Liu Xi Li Jiang Zhou Han Huang Jun He Xiaoming Yuan Hunan Key Laboratory of Super Micro-structure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China School of Physics and Electronic Sciences Changsha University of Science and TechnologyChangsha 410004China School of Materials Science and Engineering Central South University Changsha 410083China

Transition metal dichalcogenide(TMD)alloys and heterostructures are attracting increasing attention thanks to their unique electronic,optical,and interfacial ***,the growth fundamental of TMD alloys and heterostructures during one-step growth is still beyond ***,thermogravimetric(TG/DTG)technology is introduced to predict the evolution of the precursor(MoO_(3)and WO_(3))concentration in the vapor during *** establish the correlation between precursor concentration and the corresponding growth ***/DTG predication suggests that tuning precursor temperature and powder ratio can alter their concentration in the vapor,well explaining the formation of Mo_(x)W_(1-x)Se_(2) alloy or MoSe_(2)-WSe_(2) heterostructure at different growth *** on the TG/DTG analysis,we further design and grow a complex MoSe_(2)-Mo_(x)W_(1-x)Se_(2)-WSe_(2) heterostructure and Mo_(x)W_(1-x)Se_(2) monolayer alloys,confirming the validity of TG/DTG prediction in TMD crystal ***,employing TG/DTG to predict the synthesis of two-dimensional materials is of importance to understand the TMD growth behavior and provide guidance to the desired TMD heterostructure formation for future photoelectric devices.

关键词： TG/DTG Mo_(x)W_(1-x)Se_(2)alloys MoSe_(2)-WSe_(2)lateral heterostructures precursor concentration

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Investigation on the Spintronic for Armchair-Shaped Δ-Graphyne Induced by Multiple Doping with A Transverse Electric Field

SSRN

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SSRN 2023年

作者： Li, Xiaobo Zhou, Jiayin Yu, Mi Li, Yun Zhou, Kezhou Wang, Xiaojing Zhang, Xiaojiao Long, Mengqiu Xiangjiang Laboratory School of Microelectronics and Physics Hunan University of Technology and Business Changsha410205 China School of Science Hunan University of Technology and Business Changsha410205 China Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha410083 China Design & Art Institute Hunan University of Technology and Business Changsha410205 China

Graphyne holds a potential spintronic application for its unusual elastic and rich electrical properties. We investigate the electronic band structure of armchair-shaped δ-graphyne nanoribbon (AδGYNR) with an applied electric field. Based on the computational data, the results of AδGYNRs with nonmetallic and metallic doping and the intrinsic mechanism of electrical properties have been analyzed. It is discovered that the nonmetallic (B, P) and metallic (Co, Ni, Cu) atoms doping of AδGYNRs can reduce the band gap of system to almost zero, resulting in an obvious spin-splitting behavior. Besides, the electric conductivity of the AδGYNRs with atomic doping at the sp-site is better than the one at the sp2-site. Above all, after applying a transverse electric field to doped AδGYNR, our results reveal that the width of band gap may vary linearly with the intensity of the electric field, in which case the Ni1-doped AδGYNR transforms into semiconductor with a narrow band and the band gap decreases from 0.55 to 0.17 eV, thus our research could be conducive to effectively modulating the width of band gap of AδGYNRs. Our findings will help to the future development of micro- and nano-electronic devices based on AδGYNR. © 2023, The Authors. All rights reserved.

关键词： Energy gap

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Wearable CNT/Ti_(3)C_(2)T_(x)MXene/PDMS composite strain sensor with enhanced stability for real-time human healthcare monitoring

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Nano Research 2021年第8期14卷 2875-2883页

作者： Xiaowen Xu Yucheng Chen Pei He Song Wang Kai Ling Longhui Liu Pengfei Lei Xianjun Huang Hu Zhao Jianyun Cao Junliang Yang Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China Hunan Engineering Research Center of Biomedical Metal and Ceramic Implants Department of Orthopedic SurgeryXiangya HospitalCentral South University87#Xiangya RoadChangsha 410007China College of Electronic Science National University of Defense TechnologyChangsha 410072China Department of Materials University of ManchesterOxford RoadManchester Ml 39PLUK

Strain sensors with good stability are vital to the development of wearable healthcare monitoring ***,the design of strain sensor with both duration stability and environmental stability is still a *** this work,we propose an ultra-stable and washable strain sensor by embedding a coupled composite film of carbon nanotube(CNT)and Ti_(3)C_(2)T_(x) MXene into polydimethylsiloxane(PDMS)*** composite strain sensor with embedded microstructure and uneven surface makes it conformal to skin,while the CNT/MXene sensing layer exhibits a resistance sensitive to *** sensor shows reliable responses at different frequencies and with long-term cycling durability(over 1,000 cycles).Meanwhile,the CNT/MXene/PDMS composite strain sensor provides the advantages of superior anti-interference to temperature change and water *** results demonstrate less than 10%resistance changes as the temperature rises from-20 to 80℃or after sonication in water for 120 min,*** composite sensor is applied to monitor human joint motions,such as bending of finger,wrist and ***,the simultaneous monitoring of the electrocardiogram(ECG)signal and joint movement while riding a sports bicycle is demonstrated,enabling the great potential of the as-fabricated sensor in real-time human healthcare monitoring.

关键词： strain sensor MXene wearable electronics healthcare monitoring

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Two-step processed efficient perovskite solar cells via improving perovskite/PTAA interface using solvent engineering in PbI2 precursor

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Chinese Physics B 2020年第4期29卷 563-570页

作者： Cao-Yu Long Ning Wang Ke-Qing Huang Heng-Yue Li Biao Liu Jun-Liang Yang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

The morphology and interface of perovskite film are very important for the performance of perovskite solar cells(PSCs).The quality of perovskite film,fabricated via two-step spin-coating process,is significantly influenced by the morphology and crystallinity of PbI2 *** the addition of additive dimethyl sulfoxide(DMSO)into the PbI2 precursor,the roughness and trap-state density of perovskite film have been significantly reduced,leading to the excellent contact between perovskite layer and subsequent deposited carrier transport ***,the planar heterojunction PSCs with an architecture of ITO/SnO2/perovskite/PTAA/Ag show an efficiency up to 19.02%.Furthermore,PSCs exhibit promising stability in air with a humidity of ~45%,and retain 80% of initial efficiency after being exposed to air for 400 h without any encapsulation.

关键词： perovskite solar cells planar heterojunction interface PbI2-DMSO complex

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The effect of air exposure on device performance of flexible C8-BTBT organic thin-film transistors with hygroscopic insulators

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Science China Materials 2020年第12期63卷 2551-2559页

作者： Pengshan Xie Tianjiao Liu Pei He Guozhang Dai Jie Jiang Jia Sun Junliang Yang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

Organic thin film transistors(OTFTs)are normally sensitive to ambient conditions and show performance degradation in *** the contrary,the performance of flexible 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene(C8-BTBT)OTFTs using cross-linked polymer layer,poly(4-vinyl-phenol)-4,4’-(hexafluoroisopropylidene)diphthalic anhydride(PVP-HDA),as the dielectric layer can be improved in air conditions with 40%relative *** soaking in air with 40%relative humidity,the electrical behavior,surface morphology,and contact angle of the flexible C8-BTBT OTFTs using PVP-HAD as dielectric layer with three different thicknesses were *** is found that,when the devices with 375 nm-thick PVP-HDA films are placed in 40%relative humidity air conditions for 6 h,the corrected average mobility(μ)can increase from 3.2 to 5.1 cm^2 V^-1 s^-***,the average threshold voltage(Vth)changes from-12.4 to-9.3 V while keeping a constant ratio of I on/Ioff=10^*** results indicate that the flexible C8-BTBT OTFTs with PVP-HDA dielectric layer exhibit interesting application prospects.

关键词： flexible electronics C8-BTBT OTFTs PVP-HDA hygroscopicity air stability

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Revealing the intrinsic nonlinear optical response of a single MoS_(2) nanosheet in a suspension based on spatial self-phase modulation

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Photonics Research 2020年第11期8卷 1725-1733页

作者： Si Xiao Ying Ma Yilin He Yiduo Wang Hao Xin Qi Fan Jingdi Zhang Xiaohong Li Yu Zhang Jun He Yingwei Wang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

The reorientation of 2D materials caused by nonlocal electron coherence is the formation mechanism of 2D material spatial self-phase modulation under laser irradiation,which is widely known as the“wind-chime”***,we present a method that provides strong evidence for the reorientation of 2D-material-induced spatial self-phase *** traditional“wind-chime”model was modified by taking into account the attenuation,i.e.,damping of the incident light beam in the direction of the optical ***,we can extract the nonlinear refractive index of a single MoS2 nanosheet,instead of simply obtaining the index from an equivalent MoS2 film that was constructed by all *** approach introduces a universal and accurate method to extract intrinsic nonlinear optical parameters from 2D material systems.

关键词： nonlinear intrinsic phase

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Solution-processed perovskite solar cells

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Journal of Central South University 2020年第4期27卷 1104-1133页

作者： CHANG Jian-hui LIU Kun LIN Si-yuan YUAN Yong-bo ZHOU Cong-hua YANG Jun-liang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

Perovskite solar cells(PSCs) have emerged as one of the most promising candidates for photovoltaic applications. Low-cost, low-temperature solution processes including coating and printing techniques makes PSCs promising for the greatly potential commercialization due to the scalability and compatibility with large-scale, roll-to-roll manufacturing processes. In this review, we focus on the solution deposition of charge transport layers and perovskite absorption layer in both mesoporous and planar structural PSC devices. Furthermore, the most recent design strategies via solution deposition are presented as well, which have been explored to enlarge the active area, enhance the crystallization and passivate the defects, leading to the performance improvement of PSC devices.

关键词： perovskite solar cells mesoporous structure planar structure solution process large-scale deposition techniques

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Passivation with crosslinkable diamine yields 0.1 V non-radiative Vloss in inverted perovskite solar cells

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Science Bulletin 2021年第5期66卷 417-420,M0003页

作者： Fang Wan Lili Ke Yongbo Yuan Liming Ding Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Organic-inorganic hybrid perovskite solar cells(PSCs)have attracted continually increasing attention in recent years due to its outstanding photoelectric properties and bright commercial prospect[1–6].So far,the certified power conversion efficiency(PCE)record of PSCs increased up to be 25.2%[7].However,the efficiency for PSCs with inverted structure was generally lower(~22.3%)[8].A major reason for the relatively lower PCE in inverted solar cells was that the achieved open-circuit voltage(V_(oc))was generally lower than that of conventional PSCs based on the same photoactive layers[9–11].

关键词：钙钛矿太阳电池开路电压能量转换效率非辐射复合载流子复合倒置结构 EDA 钝化

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