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Rational Core–Shell Design of Open Air Low Temperature In Situ Processable CsPbI 3 Quasi‐Nanocrystals for Stabilized p‐i‐n Solar Cells
Author(s) -
Xi Jun,
Piao Chengcheng,
Byeon Junseop,
Yoon Jungjin,
Wu Zhaoxin,
Choi Mansoo
Publication year - 2019
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.201901787
Subject(s) - nanocrystal , materials science , rational design , perovskite (structure) , iodide , nanotechnology , photovoltaic system , in situ , energy conversion efficiency , doping , chemical engineering , optoelectronics , inorganic chemistry , organic chemistry , ecology , chemistry , engineering , biology
Abstract As a promising alternative, inorganic perovskite nanocrystals allow reinforced stability of photovoltaic device. Unfortunately, directly assembling these nanocrystals into film is uncontrollable. Instead, in situ assembling technology under low temperature in open air is attractive but limited due to the tendency of nonperovskite transition. The adverse shell ligands and unstable core lattices are known as the fundamental problems. In order to address this issue, here proposed is a rational core–shell design: 1) with respect to ligands, a new one, 4‐fluorophenethylammonium iodide, is used to enhance bonding force and charge coupling between ligands and nanocrystals; 2) with respect to lattices, a novel compound H 2 PbI 4 is employed to assist divalent ion (Mn 2+ ) doping into perovskite lattices. By low temperature in situ processing CsPbI 3 quasi‐nanocrystal film, the highest power conversion efficiency of 13.4% for p‐i‐n solar cells is achieved, which retains 92% after 500 h in ambient air. The current study underlines the significance of rational hierarchical design of inorganic perovskite nanocrystals, especially for low temperature in situ processable electronic devices.