Spatial Distribution Recast for Organic Bulk Heterojunctions for High-Performance All-Inorganic Perovskite/Organic Integrated Solar Cells
Weijie Chen1, Dong Li2, Shanshan Chen3, Shuo Liu1, Yunxiu Shen1, Guang Zeng1, Xiaozhang Zhu4,*（朱晓张）, Erjun Zhou5,*（周二军）,Lin Jiang2, Yaowen Li1,*（李耀文）, and Yongfang Li1,6
1Laboratory of Advanced Optoelectronic Materials,College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou 215123, China
2Institute of Functional Nano and Soft Materials (FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices,Soochow University,Suzhou 215123, China
3MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems CQU-NUS Renewable Energy Materials & Devices Joint Laboratory School of Energy & Power Engineering,Chongqing University,Chongqing 400044, China
4Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids.Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190, China
5CAS Key Laboratory of Nanosystem and Hierarchical Fabrication,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,Beijing 100190, China
6Beijing National Laboratory for Molecular Sciences,Institute of Chemistry Chinese Academy of Sciences,Beijing 100190, China
Adv. Energy Mater.2020, 2000851
All-inorganic CsPbIBr2 perovskite solar cells (pero-SCs) exhibit excellent overall stability, but their power conversion efficiencies (PCEs) are greatly limited by their wide bandgaps. Integrated solar cells (ISCs) are considered to be an emergent technology that could extend their photoresponse by directly stacking two distinct photoactive layers with complementary bandgaps. However, rising photocurrents always sacrifice other photovoltaic parameters, thereby leading to an unsatisfactory PCE. Here, a recast strategy is proposed to optimize the spatial distribution components of low-bandgap organic bulk-heterojunction (BHJ) film, and is combined with an all-inorganic perovskite to construct perovskite/BHJ ISCs. With this strategy, the integrated perovskite/BHJ film with a top-enriched donor-material spatial distribution is shown to effectively improve ambipolar charge transport behavior and suppress charge carrier recombination. For the first time, the ISC is not only significantly extended and enhanced the photoresponse achieving a 20% increase in current density, but also exhibits a high open-circuit voltage and fill factor at the same time. As a result, a record PCE of 11.08% based on CsPbIBr2 pero-SCs is realized; it simultaneously shows excellent long-term stability against heat and ultraviolet light.
链接：https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.202000851
