标题：Reduced 0.418 V VOC-deficit of 1.73 eV widebandgap perovskite solar cells assisted by dual chlorides for efficient all-perovskite tandems
作者：Yue Zhao, 1,2 Changlei Wang,1,2,* Tianshu Ma,1,2 Luwei Zhou,1,2 Zhanghao Wu,1,2 Huayang Wang,1,2 Cong Chen,3 Zhenhua Yu,4 Weiwei Sun,5 Aolin Wang,6 Hao Huang,6 Bingsuo Zou,6* Dewei Zhao 3,* and Xiaofeng Li 1,2,*
单位：
1. School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University
2. Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University
3. College of Materials Science and Engineering, Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education, Sichuan University
4. Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education of China, School of Physics and Technology, Wuhan University
5. College of Aerospace Science and Engineering, National University of Defense Technology
6. Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environments and Materials, Guangxi University
摘要：
Wide-bandgap (wide-Eg) perovskites with bandgaps over 1.65 eV have great potential for constructing tandem solar cells (TSCs); however, they still suffer from large open-circuit voltage (VOC) deficits. Phase segregation and non-radiative recombination are great challenges for inverted wide-Eg perovskite solar cells (PSCs) to achieve an ideal VOC and long-term operation stability. Herein, we report a synergistic strategy of using lead chloride (PbCl2) and phenethylammonium chloride (PMACl) to introduce chlorine (Cl) into a bulk film and form a two-dimensional (2D) phase at the film surface for 1.73 eV wide-Eg PSCs, which reduce the VOC-deficit from 0.558 V to 0.418 V. Cl in PbCl2 enters the crystal lattice of the perovskite film, reducing the halide vacancies and suppressing ion migration. Meanwhile, PMACl facilitates the formation of a 2D perovskite phase at the grain surfaces, alleviating recombination and improving the stability. As a result, the best-performing wide-Eg PSC with a high VOC of 1.312 V and an efficiency of over 20% is achieved, enabling the fabrication of two-terminal all-perovskite TSCs with a champion efficiency of 26.68%. This work provides in-depth insights into how Cl suppresses phase segregation and non-radiative recombination in wide-Eg PSCs, offering a promising strategy for efficient and stable all-perovskite TSCs.
影响因子：39.714
链接：https://pubs.rsc.org/en/content/articlelanding/2023/ee/d2ee04087e