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2. Rational molecular and device design enables organic solar cells approaching 20% efficiency.

Author

Fu, Jiehao, Yang, Qianguang, Huang, Peihao, Chung, Sein, Cho, Kilwon, Kan, Zhipeng, Liu, Heng, Lu, Xinhui, Lang, Yongwen, Lai, Hanjian, He, Feng, Fong, Patrick, Lu, Shirong, Xiao, Zeyun, Li, Gang, and Yang, Yang

Abstract

For organic solar cells to be competitive, the light-absorbing molecules should simultaneously satisfy multiple key requirements, including weak-absorption charge transfer state, high dielectric constant, suitable surface energy, proper crystallinity, etc. However, the systematic design rule in molecules to achieve the abovementioned goals is rarely studied. In this work, guided by theoretical calculation, we present a rational design of non-fullerene acceptor o-BTP-eC9, with distinct photoelectric properties compared to benchmark BTP-eC9. o-BTP-eC9 based device has uplifted charge transfer state, therefore significantly reducing the energy loss by 41 meV and showing excellent power conversion efficiency of 18.7%. Moreover, the new guest acceptor o-BTP-eC9 has excellent miscibility, crystallinity, and energy level compatibility with BTP-eC9, which enables an efficiency of 19.9% (19.5% certified) in PM6:BTP-C9:o-BTP-eC9 based ternary system with enhanced operational stability.

Published
2024

9. Understanding the Role of Triplet-triplet Annihilation in Non-fullerene Acceptor Organic Solar Cells

Author

Hart, Lucy J. F., Grüne, Jeannine, Liu, Wei, Lau, Tsz-ki, Luke, Joel, Chin, Yi-Chun, Jiang, Xinyu, Zhang, Huotian, Sowood, Daniel J. C., Unson, Darcy M. L., Kim, Ji-Seon, Lu, Xinhui, Zou, Yingping, Gao, Feng, Sperlich, Andreas, Dyakonov, Vladimir, Yuan, Jun, and Gillett, Alexander J.

Subjects
Physics - Applied Physics
Abstract

Non-fullerene acceptors (NFAs) have enabled power conversion efficiencies exceeding 19% in organic solar cells (OSCs). However, the open-circuit voltage of OSCs remains low relative to their optical gap due to excessive non-radiative recombination, and this now limits performance. Here, we consider an important aspect of OSC design, namely management of the triplet exciton population formed after non-geminate charge recombination. By comparing the blends PM6:Y11 and PM6:Y6, we show that the greater crystallinity of the NFA domains in PM6:Y11 leads to a higher rate of triplet-triplet annihilation (TTA). We attribute this to the four times larger ground state dipole moment of Y11 versus Y6, which improves the long range NFA out-of-plane ordering. Since TTA converts a fraction of the non-emissive triplet states into bright singlet states, it has the potential to reduce non-radiative voltage losses. Through a kinetic analysis of the recombination processes under 1-Sun illumination, we provide a framework for determining the conditions under which TTA may improve OSC performance. If these could be satisfied, TTA has the potential to reduce non-radiative voltage losses by up to several tens of mV and could thus improve OSC performance., Comment: 41 pages, 5 figures

Published
2023

10. 19.31% binary organic solar cell and low non-radiative recombination enabled by non-monotonic intermediate state transition

Author

Fu, Jiehao, Fong, Patrick WK, Liu, Heng, Huang, Chieh-Szu, Lu, Xinhui, Lu, Shirong, Abdelsamie, Maged, Kodalle, Tim, Sutter-Fella, Carolin M, Yang, Yang, and Li, Gang

Subjects
Engineering, Macromolecular and Materials Chemistry, Materials Engineering, Chemical Sciences
Abstract

Non-fullerene acceptors based organic solar cells represent the frontier of the field, owing to both the materials and morphology manipulation innovations. Non-radiative recombination loss suppression and performance boosting are in the center of organic solar cell research. Here, we developed a non-monotonic intermediate state manipulation strategy for state-of-the-art organic solar cells by employing 1,3,5-trichlorobenzene as crystallization regulator, which optimizes the film crystallization process, regulates the self-organization of bulk-heterojunction in a non-monotonic manner, i.e., first enhancing and then relaxing the molecular aggregation. As a result, the excessive aggregation of non-fullerene acceptors is avoided and we have achieved efficient organic solar cells with reduced non-radiative recombination loss. In PM6:BTP-eC9 organic solar cell, our strategy successfully offers a record binary organic solar cell efficiency of 19.31% (18.93% certified) with very low non-radiative recombination loss of 0.190 eV. And lower non-radiative recombination loss of 0.168 eV is further achieved in PM1:BTP-eC9 organic solar cell (19.10% efficiency), giving great promise to future organic solar cell research.

Published
2023

32. Perovskite Quantum Wells Formation Mechanism for Stable Efficient Perovskite Photovoltaics—A Real‐Time Phase‐Transition Study

Author

Hu, Hanlin, Qin, Minchao, Fong, Patrick WK, Ren, Zhiwei, Wan, Xuejuan, Singh, Mriganka, Su, Chun‐Jen, Jeng, U‐Ser, Li, Liang, Zhu, Jiajie, Yuan, Mingjian, Lu, Xinhui, Chu, Chih‐Wei, and Li, Gang

Subjects
perovskite photovoltaics, perovskite quantum wells, phase&#8208, transitions, phase-transitions, Physical Sciences, Chemical Sciences, Engineering, Nanoscience & Nanotechnology
Abstract

The combination of a bulk 3D perovskite layer and a reduced dimensional perovskite layer (perovskite quantum wells (PQWs)) is demonstrated to enhance the performance of perovskite solar cells (PSCs) significantly in terms of stability and efficiency. This perovskite hierarchy has attracted intensive research interest; however, the in-depth formation mechanism of perovskite quantum wells on top of a 3D perovskite layer is not clearly understood and is therefore the focus of this study. Along with ex situ morphology and photophysical characterization, the time-resolved grazing-incidence wide-angle X-ray scattering (TS-GIWAXS) technique performed in this study provides real-time insights on the phase-transition during the organic cation (HTAB ligand molecule) coating and PQWs/3D architecture formation process. A strikingly strong ionic reaction between the 3D perovskite and the long-chain organic cation leads to the quick formation of an ordered intermediate phase within only a few seconds. The optimal PQWs/3D architecture is achieved by controlling the HTAB casting, which is assisted by time-of-flight SIMS characterization. By controlling the second ionic reaction during the long-chain cation coating process, along with the fluorinated poly(triarylamine) (PTAA) as a hole-transport layer, the perovskite solar cells demonstrate efficiencies exceeding 22% along with drastically improved device stability.

Published
2021

33. Graded bulk-heterojunction enables 17% binary organic solar cells via nonhalogenated open air coating

Author

Zhang, Ying, Liu, Kuan, Huang, Jiaming, Xia, Xinxin, Cao, Jiupeng, Zhao, Guangming, Fong, Patrick WK, Zhu, Ye, Yan, Feng, Yang, Yang, Lu, Xinhui, and Li, Gang

Subjects
Engineering, Macromolecular and Materials Chemistry, Materials Engineering, Chemical Sciences
Abstract

Graded bulk-heterojunction (G-BHJ) with well-defined vertical phase separation has potential to surpass classical BHJ in organic solar cells (OSCs). In this work, an effective G-BHJ strategy via nonhalogenated solvent sequential deposition is demonstrated using nonfullerene acceptor (NFA) OSCs. Spin-coated G-BHJ OSCs deliver an outstanding 17.48% power conversion efficiency (PCE). Depth-profiling X-ray photoelectron spectroscopy (DP-XPS) and angle-dependent grazing incidence X-ray diffraction (GI-XRD) techniques enable the visualization of polymer/NFA composition and crystallinity gradient distributions, which benefit charge transport, and enable outstanding thick OSC PCEs (16.25% for 300 nm, 14.37% for 500 nm), which are among the highest reported. Moreover, the nonhalogenated solvent enabled G-BHJ OSC via open-air blade coating and achieved a record 16.77% PCE. The blade-coated G-BHJ has drastically different D-A crystallization kinetics, which suppresses the excessive aggregation induced unfavorable phase separation in BHJ. All these make G-BHJ a feasible and promising strategy towards highly efficient, eco- and manufacture friendly OSCs.

Published
2021

40. Durable All Inorganic Perovskite Tandem Photovoltaics

Author

Yan, Keyou, primary, Duan, Chenghao, additional, Zhang, Kaicheng, additional, Peng, Zijian, additional, Li, Shiang, additional, Zou, Feilin, additional, Wang, Feng, additional, Li, Jiong, additional, Zhang, Zheng, additional, Chen, Chang, additional, Zhu, Qiliang, additional, Qiu, Jianhang, additional, Lu, Xinhui, additional, Li, Ning, additional, Ding, Liming, additional, Brabec, Christoph, additional, and Gao, Feng, additional

Published
2024
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41. Beyond Conventional Enhancements: Self‐Organization of a Buffer Material on Tin Oxide as a Game‐Changer for Improving the Performance of Inverted Organic Solar Cells

Author

Wu, Jifa, primary, Li, Yumeng, additional, Tang, Feng, additional, Guo, Yinchun, additional, Liu, Guoqiang, additional, Wu, Shaoguang, additional, Hu, Bin, additional, Fu, Yuang, additional, Lu, Xinhui, additional, Lu, Guanghao, additional, He, Zhicai, additional, Zhu, Xuhui, additional, and Peng, Xiaobin, additional

Published
2024
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42. Insights Into Pre‐aggregation Control of Y‐series Non‐fullerene Acceptors in Liquid State for Highly Efficient Binary Organic Solar Cells

Author

Hu, Dingqin, primary, Tang, Hua, additional, Chen, Chen, additional, Huang, Peihao, additional, Shen, Zhibang, additional, Li, Hongxiang, additional, Liu, Heng, additional, Petoukhoff, Christopher E., additional, Jurado, José Piers, additional, Luo, Ying, additional, Xia, Hao, additional, Fong, Patrick W. K., additional, Fu, Jiehao, additional, Zhao, Lingyu, additional, Yan, Cenqi, additional, Chen, Yao, additional, Cheng, Pei, additional, Lu, Xinhui, additional, Li, Gang, additional, Laquai, Frédéric, additional, and Xiao, Zeyun, additional

Published
2024
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