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Long Electron–Hole Diffusion Length in High‐Quality Lead‐Free Double Perovskite Films
Author(s) -
Ning Weihua,
Wang Feng,
Wu Bo,
Lu Jun,
Yan Zhibo,
Liu Xianjie,
Tao Youtian,
Liu JunMing,
Huang Wei,
Fahlman Mats,
Hultman Lars,
Sum Tze Chien,
Gao Feng
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201706246
Subject(s) - materials science , perovskite (structure) , diffusion , lead (geology) , quality (philosophy) , electron , chemical physics , condensed matter physics , nanotechnology , engineering physics , chemical engineering , thermodynamics , nuclear physics , philosophy , epistemology , geomorphology , engineering , geology , physics
Developing environmentally friendly perovskites has become important in solving the toxicity issue of lead‐based perovskite solar cells. Here, the first double perovskite (Cs 2 AgBiBr 6 ) solar cells using the planar structure are demonstrated. The prepared Cs 2 AgBiBr 6 films are composed of high‐crystal‐quality grains with diameters equal to the film thickness, thus minimizing the grain boundary length and the carrier recombination. These high‐quality double perovskite films show long electron–hole diffusion lengths greater than 100 nm, enabling the fabrication of planar structure double perovskite solar cells. The resulting solar cells based on planar TiO 2 exhibit an average power conversion efficiency over 1%. This work represents an important step forward toward the realization of environmentally friendly solar cells and also has important implications for the applications of double perovskites in other optoelectronic devices.