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Enhancing Photoresponse and Photocurrent of Integrated Perovskite/Organic Solar Cells via layer-by-layer processing

ACS APPLIED ENERGY MATERIALS 2022年第2期6卷 981-988页

作者： He, Xiang Xu, Tianyu Zhang, Xinxin Gong, Shuai Zhang, Wenjun Song, Weijie Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China Univ Sci & Technol China Nano Sci & Technol Inst Suzhou 215123 Peoples R China Ningbo Univ Sch Mat Sci & Chem Engn Ningbo 315100 Peoples R China Jiangxi Univ Sci & Technol Coll Mat Met & Chem Ganzhou 341000 Peoples R China Univ Chinese Acad Sci Ctr Mat Sci & Optoelect Engn Beijing 100049 Peoples R China Jiangsu Collaborat Innovat Ctr Photovolta Sci & En Changzhou 213164 Peoples R China Zhejiang Lab Res Ctr Sensing Mat & Devices Hangzhou 311121 Zhejiang Peoples R China

Perovskite solar cells have developed rapidly in recent years to almost rival silicon cells. To extend the photoresponse in the near-infrared region, integrated perovskite/organic solar cells (IPOSCs) have been developed. Typically, the organic bulk heterojunction (BHJ) in IPOSCs is built by one-step coating of a mixed solution of a donor and an acceptor. Here, we prepare the BHJ by layer-by-layer (LBL) processing. Compared to the traditional one-step coated IPOSCs (TOS device), the LBL-processed device (LBL device) exhibits a distinctly improved short-circuit current density (JSC) and power conversion efficiency. The TOS device shows a high photoresponse from about 400 to 900 nm, while the LBL device shows a high photoresponse extending to about 950 nm. Further research indicates that the extending photoresponse of the LBL-device is caused by the redshift of absorption of the organic BHJ. Meanwhile, the LBL-processed BHJ exhibits slightly improved carrier extraction and recombination. The introduction of LBL processing provides an approach to broaden the optical absorption range and photoresponse of IPOSCs.

关键词： layer-by-layer processing integrated perovskite organic solar cells photocurrent and photoresponse morphology nonfullerene

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Volatile Additive Assists Binary layer-by-layer Solution processing Organic Solar Cells to Achieve 19%Efficiency

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Chinese Journal of Chemistry 2024年第24期42卷 3581-3587页

作者： Luye Cao Hengyuan Zhang Xiaoyang Du Xinrui Li Hui Lin Gang Yang Caijun Zheng Silu Tao Yangtze Delta Region Institute(Huzhou)& School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaHuzhouZhejiang 313001China School of Electrical Engineering and Electronic Information Xihua UniversityChengduXichuan 610039China

layer-by-layer(LbL)solution processing is an efficient method to realize high performance organic solar cells(OSCs).One of the drawbacks of the LbL-processed active layer is the large difference in the crystallinity of the donor and acceptor,which will lead to imbalance charge transfer and result in unfavorable charge ***,we combined a novel volatile additive 3,5-dichloro-2,4,6-trifluorobenzotrifluoride(DTBF)with the LbL method to realize high-efficiency *** interacts with the non-fullerene acceptor BTP-4F by non-covalent bonding,which enhances the crystallinity and compact stacking of *** doped OSC has balanced and efficient electron transport properties,longer carrier lifetime,higher exciton dissociation and charge collection efficiencies,lower energetic disorder than the control OSC without any *** from the optimization of charge dynamics and micro-morphology by DTBF,the binary LbL-processed OSC achieved synergistic improvements in open-circuit voltage,short-circuit current density and fill *** a result,a champion power conversion efficiency(PCE)of 19%is realized for DTBF-optimized OSC,which is superior to the control OSC(17.55%).This work demonstrates a promising approach to modulate active layer morphology and fabricate high performance OSCs.

关键词： Volatile additive layer-by-layer processing Organic solar cells Electron transport Semiconductors NMR spectroscopy

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Advancing Intrinsically Stretchable Organic Photovoltaics with a Nearly Amorphous Polymer Semiconductor

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ADVANCED FUNCTIONAL MATERIALS 2025年

作者： Pei, Luoxi Han, Dexia Wang, Yuxuan Gao, Mengyuan Wu, Junjiang Sun, Chunlong Yu, Mengqi Wang, Yi-Xuan Ke, Huizhen Li, Xin Ye, Long Xinjiang Univ Sch Text & Clothing Xinjiang 830046 Peoples R China Minjiang Univ Fujian Key Lab Novel Funct Text Fibers & Mat Fuzhou 350108 Peoples R China Tianjin Univ Sch Mat Sci & Engn State Key Lab Adv Mat Intelligent Sensing Minist EducKey Lab Organ Integrated CircuitsTian Tianjin 300350 Peoples R China Tianjin Univ Collaborat Innovat Ctr Chem Sci & Engn Tianjin Tianjin 300350 Peoples R China Tianjin Univ Collaborat Innovat Ctr Chem Sci & Engn Tianjin Sch Sci Dept ChemKey Lab Organ Integrated CircuitsMinist Tianjin 300072 Peoples R China Hubei Longzhong Lab Xiangyang 441000 Peoples R China

Current state-of-the-art organic photovoltaic (OPV) films, composed of conjugated polymer donors and small molecule acceptors, are often limited by the high brittleness of their rigid backbones, which restricts their application in wearable devices. In contrast, all-polymer OPVs have demonstrated enhanced intrinsic stretchability, but further advancements are necessary to meet the wearable demands. Here, an uncharted strategy is reported to enhance the mechanical stretchability and performance of all-polymer OPVs by incorporating a nearly-amorphous conjugated polymer, poly(indacenodithiophene-co-benzothiadiazole) (IDTBT) into a layer-by-layer structured active layer. IDTBT possesses a high fracture strain of approximate to 80%, significantly outperforming well-known donor polymers like PM6. The incorporation of IDTBT enhances the mechanical properties, with mechanical and photovoltaic performance both optimized at low contents. More importantly, the intrinsically stretchable all-polymer OPVs demonstrate superior mechanical stability and an impressive power conversion efficiency of 14.2%, the highest reported to date in this category. Particularly, the IDTBT-strengthened OPVs retain 72% of their initial efficiency under a tensile strain of 50%, and 68% even after being stretched hundreds of times at 30% strain, demonstrating exceptional tensile stability. This approach underscores the potential of nearly-amorphous polymer semiconductors in designing highly stretchable OPVs, paving the way for their seamless integration into wearable electronics.

关键词： all-polymer solar cells layer-by-layer processing mechanical properties stretchable organic photovoltaics polymer semiconductors

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layer-by-layer Organic Solar Cells Enabled by 1,3,4-Selenadiazole-Containing Crystalline Small Molecule with Double-Fibril Network Morphology

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ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 2024年第21期63卷 e202402831-e202402831页

作者： Chen, Xuyang Li, Yinfeng Jing, Wenwen Zhou, Tao Xu, Xiaopeng Duan, Yuwei Yu, Liyang Li, Ruipeng Peng, Qiang Sichuan Univ Sch Chem Engn Chengdu 610065 Peoples R China Sichuan Univ State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China Chengdu Univ Technol Coll Mat & Chem & Chem Engn Chengdu 610059 Peoples R China Brookhaven Natl Lab Natl Synchrotron Light Source 2 Upton NY 11973 USA

A double-fibril network of the photoactive layer morphology is recognized as an ideal structure facilitating exciton diffusion and charge carrier transport for high-performance organic solar cells (OSCs). However, in the layer-by-layer processed OSCs (LbL-OSCs), polymer donors and small molecule acceptors (SMAs) are separately deposited, and it is challenging to realize a fibril network of pure SMAs with the absence of tight interchain entanglement as polymers. In this work, crystalline small molecule donors (SMDs), named TDZ-3TR and SeDZ-3TR, were designed and introduced into the L8-BO acceptor solution, forcing the phase separation and molecular fibrilization. SeDZ-3TR showed higher crystallinity and lower miscibility with L8-BO acceptor than TDZ-3TR, enabling more driving force to favor the phase separation and better molecular fibrilization of L8-BO. On the other hand, two donor polymers of PM6 and D18 with different fibril widths and lengths were put together to optimize the fibril network of the donor layer. The simultaneously optimization of the acceptor and donor layers resulted in a more ideal double-fibril network of the photoactive layer and an impressive power conversion efficiency (PCE) of 19.38% in LbL-OSCs.

关键词： organic solar cells layer-by-layer processing morphology control nano fibril small molecule additive

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Developing Benzodithiophene-Free donor polymer for 19.36% efficiency Green-Solvent-Processable organic solar cells

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CHEMICAL ENGINEERING JOURNAL 2024年 490卷

作者： He, Ying Jing, Wenwen Liao, Chentong Xu, Xiaopeng Duan, Yuwei Li, Ruipeng Yu, Liyang Peng, Qiang Sichuan Univ Sch Chem Engn Chengdu 610065 Peoples R China Sichuan Univ State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China Chengdu Univ Technol Coll Mat & Chem & Chem Engn Chengdu 610059 Peoples R China Brookhaven Natl Lab Natl Synchrotron Light Source II Upton NY 11973 USA

In this work, a newly benzodithiophene-free D -A polymer donor, named PDTP-BDD, was developed for realizing green -solvent processed high-performance OSCs. By bridging two electron -rich unit of dithieno[3,2-b:2 ' ,3 ' -d] pyridin-5(4H)-one (DTP) and electron -deficient benzo[1,2-c:4,5c ' ]dithiophene-4,8-dione (BDD) with thiophene units, PDTP-BDD possesses high absorption in the short wavelength range and a deep HOMO energy level. The rigid building blocks also make PDTP-BDD has strong aggregation and poor solubility in common halogen -free solvents (such as o -xylene) at room temperature, but it is readily dissolved and disaggregated at high temperature (120 degrees C). After cooling down to a lower temperature (60 degrees C), PDTP-BDD self -assembled and pre -aggregated slowly in the solution at a long time. By employing a delayed processing strategy in the layer -by -layer processed OSCs (LbL-OSCs), an optimized fibril network of the underling layer was realized, enabling the permeation of acceptor into the donor network. The optimized PDTP-BDD/L8-BO-based LbL-OSCs realized a high PCE of 18.42 %. By adding a small amount of D18 to further optimize the PDTP-BDD fibril network, an impressive PCE of 19.36 % was achieved finally in the resulting ternary LbL-OSCs, which is the highest value for OSCs processed by halogen -free solvents.

关键词： Organic solar cells Green solvent aging layer-by-layer processing Morphology optimization Fibrous-network structure

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Ternary All-Polymer Solar Cells with Efficiency up to 18.14% Employing a Two-Step Sequential Deposition

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ADVANCED MATERIALS 2023年第7期35卷 2209350-2209350页

作者： Yang, Xinrong Sun, Rui Wang, Yuheng Chen, Mingxia Xia, Xinxin Lu, Xinhui Lu, Guanghao Min, Jie Wuhan Univ Inst Adv Studies Wuhan 430072 Peoples R China Ningbo Univ Fac Elect Engn & Comp Sci Ningbo 315211 Peoples R China Chinese Univ Hong Kong Dept Phys Hong Kong 999077 Peoples R China Xi An Jiao Tong Univ Frontier Inst Sci & Technol Xian 710054 Peoples R China

Achieving a finely tuned active layer morphology with a suitable vertical phase to facilitate both charge generation and charge transport has long been the main goal for pursuing the highly efficient bulk heterojunction all-polymer solar cells (all-PSCs). Herein, a solution to address the above challenge via synergistically combining the ternary blend strategy and the layer-by-layer (LbL) procedure is proposed. By introducing a synthesized polymer acceptor (P-A), PY-Cl, with higher crystallinity into the designed host acceptor PY-SSe-V, vertical phase distribution and molecular ordering of the LbL-type ternary all-PSCs can be improved in comparison to the LbL-type PM6/PY-SSe-V binary all-PSCs. The formation of the superior bulk microstructure can not only promote charge transport and extraction properties but also reduce energetic disorder and non-radiative recombination loss, thus improving all three photovoltaic parameters simultaneously. Consequently, the PM6/(PY-SSe-V:PY-Cl) ternary all-PSCs show the best efficiency of 18.14%, which is among the highest values reported to date for all-PSCs. This work provides a facile and effective LbL-type ternary strategy for obtaining high-efficiency all-PSCs.

关键词： all-polymer solar cells layer-by-layer processing polymerized small molecular acceptors sequential deposition ternary active layer

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Review of bio-inspired image sensors for efficient machine vision

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Advanced Photonics 2024年第2期6卷 7-19页

作者： Wenhao Tang Qing Yang Hang Xu Yiyu Guo Jiqiang Zhang Chunfang Ouyang Leixin Meng Xu Liu Zhejiang Laboratory Research Center for Frontier Fundamental StudiesHangzhouChina Zhejiang University College of Optical Science and EngineeringState Key Laboratory of Extreme Photonics and InstrumentationHangzhouChina ZJU-Hangzhou Global Scientific and Technological Innovation Center HangzhouChina Shanghai Jiao Tong University Chip Hub for Integrated Photonics Xplore(CHIPX)WuxiChina

With the rapid development of sensor networks,machine vision faces the problem of storing and computing massive *** human visual system has a very efficient information sense and computation ability,which has enlightening significance for solving the above problems in machine *** review aims to comprehensively summarize the latest advances in bio-inspired image sensors that can be used to improve machine-vision processing *** briefly introducing the research background,the relevant mechanisms of visual information processing in human visual systems are briefly discussed,including layerby-layer processing,sparse coding,and neural ***,the cases and performance of image sensors corresponding to various bio-inspired mechanisms are ***,the challenges and perspectives of implementing bio-inspired image sensors for efficient machine vision are discussed.

关键词： bio-inspired image sensor machine vision layer-by-layer processing sparse coding neural adaptation

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A Water-Processed Mesoscale Structure Enables 18.5% Efficient Binary layer-by-layer Organic Solar Cells

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POLYMERS 2024年第1期16卷 91页

作者： Xie, Chen Huang, Hui Li, Zijian Zeng, Xianghui Deng, Baoshen Li, Chengsheng Zhang, Guangye Li, Shunpu Shenzhen Technol Univ Coll New Mat & New Energies Shenzhen 518118 Peoples R China

The two-step layer-by-layer (LBL) deposition of donor and acceptor films enables desired vertical phase separation and high performance in organic solar cells (OSCs), which becomes a promising technology for large-scale printing devices. However, limitations including the use of toxic solvents and unpredictable infiltration between donor and acceptor still hinder the commercial production of LBL OSCs. Herein, we developed a water-based nanoparticle (NP) ink containing donor polymer to construct a mesoscale structure that could be infiltrated with an acceptor solution. Using non-halogen o-xylene for acceptor deposition, the LBL strategy with a mesoscale structure delivered outstanding efficiencies of 18.5% for binary PM6:L8-BObased LBL OSCs. Enhanced charge carrier mobility and restricted trap states were observed in the meso-LBL devices with optimized vertical morphology. It is believed that the findings in this work will bring about more research interest and effort on eco-friendly processing in preparation for the industrial production of OSCs.

关键词： organic solar cells layer-by-layer processing eco-friendly water-processing nanoparticulate mesoscale structure

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19.10% Efficiency and 80.5% Fill Factor layer-by-layer Organic Solar Cells Realized by 4-Bis(2-Thienyl)Pyrrole-2,5-Dione Based Polymer Additives for Inducing Vertical Segregation Morphology (vol 35, 2208279, 2023)

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ADVANCED MATERIALS 2023年第35期35卷 2305240-2305240页

作者： Zhou, Mingwei Liao, Chentong Duan, Yuwei Xu, Xiaopeng Yu, Liyang Li, Ruipeng Peng, Qiang Sichuan Univ Sch Chem Engn Chengdu 610065 Peoples R China Sichuan Univ Sch Chem Engn Chengdu 610065 Peoples R China Shaanxi Normal Univ Key Lab Appl Surface & Colloid Chem Shaanxi Engn Lab Adv Energy Technol Minist EducShaanxi Key Lab Adv Energy DevicesSc Xian 710119 Peoples R China Natl Synchrotron Light Source II Brookhaven Natl Upton NY 11973 USA

The morphology plays a key role in determining the charge generation and collection process, thus impacting the performances of organic solar cells (OSCs). The limited selection pool of additives to optimize the morphology of OSCs, especially for the emerging layer-by-layer (LbL) OSCs, impeding the improvements of photovoltaic performances. Herein, a new method of using conjugated polymers as the additives to optimize the morphology for improving the photovoltaic performances of LbL-OSCs is reported. Four polymers of PH, PS, PF, and PCl are developed with different side chains. These polymers exhibit poor performances as donor materials and additives in the BHJ devices, due to the unsuitable energy level alignment and unfavorable molecular interactions. By contrast, they can be served as efficient additives to optimize the PM6 fibril matrix for facilitating the penetration of BTP-eC9 and forming an intertwined D/A bicontinuous network with a vertical segregation. Such morphology is optimized by side chain engineering, which enables the progressive improvement of the charge separation and collection. As a result, adding a small amount of PCl as the additive, the optimized morphology contributes to a champion PCE of 19.10% with a high FF of 80.5%.

关键词： 4-bis(2-thienyl)pyrrole-2 5-dione layer-by-layer processing morphology nonfullerene solar cells polymer additive

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layer-by-layer Processed Efficient All-Polymer Solar Cells Based on a Nonfused Polymerized Small Molecule Acceptor

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MACROMOLECULAR CHEMISTRY AND PHYSICS 2023年第3期224卷 2200395-2200395页

作者： Zhang, Chen Ge, Zhongwei Xue, Jingwei Ma, Wei Sun, Yanming Beihang Univ Sch Chem Beijing 100191 Peoples R China Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China

The development of polymer acceptors is of crucial importance for all-polymer solar cells (all-PSCs). However, the state-of-the-art polymer acceptors are typically based on Y-series small molecule acceptors. Their synthetic complexity and high synthesis cost remain a severe challenge for future practical application of organic photovoltaics. Herein, a novel non-fused polymer acceptor named PDO is synthesized. The all-PSC achieves a best power conversion efficiency of 9.68% in the layer-by-layer (LBL) processed device, which is much better than that (8.14%) of the conventional bulk-heterojunction device. Comprehensive analysis on the electrical and morphological characterizations reveal that the improved device performance in the LBL-processed device is originated from efficient exciton extraction and charge transport, suppresses charge recombination, improves molecular ordering, and optimizes active layer morphology. These results validate that the fabrication of all-PSCs with non-fused polymerized small molecule acceptors is a promising strategy to develop low-cost and high-performance all-PSCs.

关键词： all-polymer solar cells layer-by-layer processing low cost nonfused polymerized acceptors

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