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Improved Carrier Management via a Multifunctional Modifier for High‐Quality Low‐Bandgap Sn–Pb Perovskites and Efficient All‐Perovskite Tandem Solar Cells

Jincheng LuoCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 ChinaRui HeCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 ChinaHuagui LaiLaboratory for Thin Films and Photovoltaics Empa‐Swiss Federal Laboratories for Materials Science and Technology Ueberlandstrasse 129 Duebendorf CH‐8600 SwitzerlandCong ChenCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 ChinaJingwei ZhuCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 ChinaYuliang XuCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 ChinaFang YaoKey Lab of Artificial Micro‐ and Nano‐Structures of Ministry of Education of China School of Physics and Technology Wuhan University Wuhan 430072 ChinaTianshu MaSchool of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China Soochow University Suzhou 215006 ChinaYi LuoCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 ChinaZongjin YiCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 ChinaYiting JiangCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 ChinaZhiyu GaoCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 ChinaJuncheng WangCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 ChinaWenwu WangCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 ChinaHao HuangState Key Laboratory of Featured Metal Materials and Life‐cycle Safety for Composite Structures & School of Resources Environment and Materials Guangxi University Nanning 530004 ChinaYe WangKey Laboratory of Material Physics Ministry of Education School of Physics and Microelectronics Zhengzhou University Zhengzhou 450052 ChinaShengqiang RenCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 ChinaQianqian LinKey Lab of Artificial Micro‐ and Nano‐Structures of Ministry of Education of China School of Physics and Technology Wuhan University Wuhan 430072 ChinaChanglei WangSchool of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China Soochow University Suzhou 215006 ChinaFan FuLaboratory for Thin Films and Photovoltaics Empa‐Swiss Federal Laboratories for Materials Science and Technology Ueberlandstrasse 129 Duebendorf CH‐8600 SwitzerlandDewei ZhaoCollege of Materials Science and Engineering Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu 610065 China

2023en

ABI

Annotatsiya

Abstract All‐perovskite tandem solar cells (TSCs) hold great promise in terms of ultrahigh efficiency, low manufacturing cost, and flexibility, stepping forward to the next‐generation photovoltaics. However, their further development is hampered by the relatively low performance of low‐bandgap (LBG) tin (Sn)–lead (Pb) perovskite solar cells (PSCs). Improving the carrier management, including suppressing trap‐assisted non‐radiative recombination and promoting carrier transfer, is of great significance to enhance the performance of Sn–Pb PSCs. Herein, a carrier management strategy is reported for using cysteine hydrochloride (CysHCl) simultaneously as a bulky passivator and a surface anchoring agent for Sn–Pb perovskite. CysHCl processing effectively reduces trap density and suppresses non‐radiative recombination, enabling the growth of high‐quality Sn–Pb perovskite with greatly improved carrier diffusion length of >8 µm. Furthermore, the electron transfer at the perovskite/C 60 interface is accelerated due to the formation of surface dipoles and favorable energy band bending. As a result, these advances enable the demonstration of champion efficiency of 22.15% for CysHCl‐processed LBG Sn–Pb PSCs with remarkable enhancement in both open‐circuit voltage and fill factor. When paired with a wide‐bandgap (WBG) perovskite subcell, a certified 25.7%‐efficient all‐perovskite monolithic tandem device is further demonstrated.

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Identifikatorlar

DOI: 10.1002/adma.202300352

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