Open AccessBoosting Performance of CsPbI 3 Perovskite Solar Cells via the Synergy of Hydroiodic Acid and Deionized Water
Author(s) -
Gao Yu,
Xu Wenzhan,
He Fang,
Fan Tianjie,
Cai Wanqing,
Zhang Xuan,
Wei Guodan
Publication year - 2022
Publication title -
advanced energy and sustainability research
Language(s) - English
Resource type - Journals
ISSN - 2699-9412
DOI - 10.1002/aesr.202100149
Subject(s) - energy conversion efficiency , materials science , pedot:pss , perovskite (structure) , grain boundary , chemical engineering , recrystallization (geology) , dissolution , tandem , nanotechnology , optoelectronics , microstructure , composite material , layer (electronics) , paleontology , engineering , biology
It remains challenging to fabricate high‐efficiency all‐inorganic perovskite solar cells (PSCs) at low temperature. Herein, the low‐temperature preparation of high‐efficiency CsPbI 3 PSCs using hydroiodic acid (HI) and deionized water (H 2 O) as additives at synthetic temperature as low as 100 °C is proposed, which is beneficial for constructing even more complicated tandem or flexible solar cells. The additive of HI facilitates CsPbI 3 to form a high‐quality and smooth perovskite film at low temperature. The addition of an optimal amount of H 2 O further induces perovskite growth with larger grains and a smoother surface by the dissolution and recrystallization process in the grain boundary, which can suppress defects‐induced nonradiative recombination. In this scenario, the corresponding device with structure of ITO/PEDOT:PSS/CsPbI 3 /PC 61 BM/Ag exhibits a high power conversion efficiency of 11.41% and the fill factor is increased from 62% to about 69%, compared with device based on CsPbI 3 film without extra H 2 O treatment. The appropriate amount of H 2 O promotes the high‐quality multigrain growth of the CsPbI 3 film and reduces the internal defects, contributing to a significant improved charge collection efficiency. Therefore, this research work has paved a significant way to improving the quality of the all‐inorganic perovskite film for highly efficient solar cells.