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Improvement of Cs‐(FAPbI 3 ) 0.85 (MAPbBr 3 ) 0.15 Quality Via DMSO‐Molecule‐Control to Increase the Efficiency and Boost the Long‐Term Stability of 1 cm 2 Sized Planar Perovskite Solar Cells
Author(s) -
Liu Xu,
Shi Lei,
Huang Jialiang,
Liu Ziheng,
Zhang Pengfei,
Yun Jae Sung,
Soufiani Arman Mahboubi,
Seidel Jan,
Sun Kaiwen,
Hameiri Ziv,
Stride John A.,
Zhang Yuanfang,
Green Martin A.,
Lin Hong,
Hao Xiaojing
Publication year - 2019
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201800338
Subject(s) - passivation , materials science , perovskite (structure) , energy conversion efficiency , crystallite , crystal (programming language) , carrier lifetime , planar , grain size , photovoltaic system , grain boundary , surface roughness , hysteresis , analytical chemistry (journal) , optoelectronics , nanotechnology , crystallography , layer (electronics) , silicon , chemistry , composite material , electrical engineering , computer graphics (images) , engineering , microstructure , quantum mechanics , physics , chromatography , computer science , programming language , metallurgy
While interfacial and grain‐boundary passivation presently attract enormous research interest for perovskite solar cells (PSCs), the improvement of Cs‐(FAPbI 3 ) X (MAPbBr 3 ) Y bulk quality still lacks systematical study, especially for constructing polycrystalline layers in planar configurations. Here, a DMSO‐molecule‐process for improving the quality of Cs‐(FAPbI 3 ) 0.85 (MAPbBr 3 ) 0.15 is developed, where the molar ratio of precursors, the kind of anti‐solvents, and speed‐time profiles are found critical. The optimized treatment significantly enhanced the crystal orientation, grain size, surface roughness, photo‐response, carrier lifetime, and contact potential difference of absorbers. Cs‐(FAPbI 3 ) 0.85 (MAPbBr 3 ) 0.15 absorbers also present superior charge transport, as well as reduced carrier recombination and decreased trap densities via DMSO‐molecule‐control, enabling performance improvement on both long‐term stability and photovoltaic parameters of 1 cm 2 PSCs. Champion planar cells demonstrated a power conversion efficiency (PCE) of 21.07% (0.159 cm 2 ) and PCE of 19.4% (1 cm 2 ) with negligible hysteresis. Moreover, 1 cm 2 devices retained 90% of initial PCE after aging 50 days in ambient air.