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Carrier Interfacial Engineering by Bismuth Modification for Efficient and Thermoresistant Perovskite Solar Cells
Author(s) -
Chen Cong,
Liu Dali,
Zhang Boxue,
Bi Wenbo,
Li Hao,
Jin Junjie,
Chen Xu,
Xu Lin,
Song Hongwei,
Dai Qilin
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201703659
Subject(s) - materials science , perovskite (structure) , crystallization , thermal stability , energy conversion efficiency , bismuth , photovoltaic system , halide , chemical engineering , optoelectronics , nanotechnology , inorganic chemistry , ecology , chemistry , biology , engineering , metallurgy
Organic–inorganic halide perovskite solar cells (PSCs) have emerged as attractive alternatives to conventional solar cells. It is still a challenge to obtain PSCs with good thermal stability and high permanence, especially at extreme outdoor temperatures. This work systematically studies the effects of Bi 3+ modification on structural, electrical, and optical properties of perovskite films (FA 0.83 MA 0.17 Pb(I 0.83 Br 0.17 ) 3 ) and the performance of corresponding PSCs. The results indicate that Bi 3+ modified PSCs can achieve better thermal stability, photovoltaic response, and reproducibility compared with control cells due to the decreased grain boundaries, enhanced crystallization, and improved electron extraction from perovskite film. As a result, the modified PSC exhibits an optimized power conversion efficiency (PCE) of 19.4% compared with 18.3% for the optimized control device, accompanied by better thermoresistant ability under 100–180 °C and enhanced long‐term stability. The degradation rate of the modified device is reduced by an order of magnitude due to effective structural defect modification in perovskite photoactive layer. It could maintain more than two months at 60 °C. These results shed light on the origin of crystallization and thermal stability of perovskite films, and provide an approach to solve thermal stability issue of PSCs.