Publication date: 17th February 2025
Our recent study on charge generation and recombination in bulk-heterojunction and planar-mixed heterojunction blends comprising a crystalline polymer donor with Se-containing Y6-derived non-fullerene acceptors has shown both high photovoltaic internal quantum efficiencies and high external electroluminescence quantum efficiencies. Crystallographic and spectroscopic studies reveal that the pseudo-2D, fused-ring molecular acceptors are not only intrinsically highly luminescent but also meets the criteria in achieving intrinsically radiative recombination within the blend by promoting delocalized excitons with much longer luminescent lifetime and reduced exciton binding energies.
These results provide the important demonstration of efficient OPV blends to achieve PCEs over 20%. Regarding the development of perovskite solar cells (PSCs), several novel interface and additive engineering approaches have been employed to enable PSCs to show very high PCE (26.9%) and stability in the inverted architecture devices. Moreover, new multifunctional redox mediators have also been developed to overcome the halide segregation issues that strongly hinder the development of highly efficient and stable large-bandgap PSCs. The resulting devices showed very low photovoltage loss and high PCE >20%. Their integration with OPV to form 2-T tandem devices has shown record-high PCE of 26.2% with good operational stability.
“Redox Mediator Stabilized Wide Bandgap Perovskites for Monolithic Perovskite-Organic Tandem Solar Cells”, S. Wu, Y. Yan, J. Yin, K. Jiang, F. Li, Z. Zeng, S. Tsang, and A. K-Y. Jen, Nature Energy 2024, 9, 411.
“Advances in inverted perovskite solar cells”, X. Zhang, S. Wu, H. Zhang, A. K.-Y. Jen, Y. Zhan & J. Chu, Nature Photonics, 2024, 18, 1243.
“Molecularly tailorable metal oxide clusters ensured robust interfacial connection in inverted perovskite solar cells”, F. Li, C. Zhao, Y. Li, Z. Zhang, X. Huang, Y. Zhang, J. Fang, T. Bian, Z. Zeng, A. K.-Y. Jen, Sci. Adv., 2024, 10, eadq1150.
“Hydrogen Bond-Bridged Intermediate for Perovskite Solar Cells with Enhanced Efficiency and Stability”, F. Li, X. Deng, Z. Shi, S. Wu, Z. Zeng, D. Wang, Y. Li, F. Qi, Z. Zhang, Z. Yang, S-H. Jang, F. R. Lin, S-W. Tsang, X. K. Chen, and A. K.-Y. Jen, Nature Photonics, 2023, 17, 478.
“Advances and Challenges in Understanding the Microscopic Structure–Property–Performance Relationship in Perovskite Solar Cells”, Y. Zhou, L. Herz, A. K-Y. Jen, and M. Saliba, Nature Energy, 2022, 7, 794.
“Dilution Effect for Highly Efficient Multiple-Component Organic Solar Cells”, L. Zuo, S. B. Jo, Y. K. Li, Y. Meng, R. J Stoddard, Y. Liu, F. Lin, F. Liu, D. S. Ginger, H-Z. Chen, A. K-Y. Jen, Nature Nanotech, 2022, 17, 53.
“Planar-Mixed Heterojunction Organic Photovoltaic Suppresses Recombination Loss”, K. Jiang, J, Zhang, C. Zhong, F. Lin, F. Qi, Q. Li, Z. Peng, W. Kaminsky, S. H. Jang, J. Yu, X. Deng, H. Hu, D. Shen, F. Gao, H. Ade, M. Xiao, C. Zhang, and A. K-Y. Jen, Nature Energy, 2022, 7, 1076.
“2D Metal–Organic Framework for Stable Perovskite Solar Cells with Minimized Lead Leakage”, Shengfan Wu, Zhen Li, Mu-Qing Li, Yingxue Diao, Francis Lin, Jie Zhang, Peter Tieu, Wenpei Gao, Feng Qi, Xiaoqing Pan, Zhengtao Xu, Zonglong Zhu, Alex K.-Y. Jen, Nature Nanotech, 2020, 15, 934.
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