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Europium and Acetate Co‐doping Strategy for Developing Stable and Efficient CsPbI 2 Br Perovskite Solar Cells
Author(s) -
Yang Shaomin,
Zhao Huan,
Han Yu,
Duan Chenyang,
Liu Zhike,
Liu Shengzhong Frank
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201904387
Subject(s) - perovskite (structure) , materials science , energy conversion efficiency , doping , relative humidity , halide , open circuit voltage , europium , carrier lifetime , perovskite solar cell , thermal stability , analytical chemistry (journal) , optoelectronics , chemical engineering , luminescence , inorganic chemistry , chemistry , voltage , silicon , electrical engineering , meteorology , physics , engineering , chromatography
All‐inorganic perovskite solar cells have developed rapidly in the last two years due to their excellent thermal and light stability. However, low efficiency and moisture instability limit their future commercial application. The mixed‐halide inorganic CsPbI 2 Br perovskite with a suitable bandgap offers a good balance between phase stability and light harvesting. However, high defect density and low carrier lifetime in CsPbI 2 Br perovskites limit the open‐circuit voltage ( V oc < 1.2 V), short‐circuit current density ( J sc < 15 mA cm −2 ), and fill factor (FF < 75%) of CsPbI 2 Br perovskite solar cells, resulting in an efficiency below 14%. For the first time, a CsPbI 2 Br perovskite is doped by Eu(Ac) 3 to obtain a high‐quality inorganic perovskite film with a low defect density and long carrier lifetime. A high efficiency of 15.25% (average efficiency of 14.88%), a respectable V oc of 1.25 V, a reasonable J sc of 15.44 mA cm −2 , and a high FF of 79.00% are realized for CsPbI 2 Br solar cells. Moreover, the CsPbI 2 Br solar cells with Eu(Ac) 3 doping demonstrate excellent air stability and maintain more than 80% of their initial power conversion efficiency (PCE) values after aging in air (relative humidity: 35–40%) for 30 days.