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Enhanced Stability and Tunable Photoluminescence in Perovskite CsPbX 3 /ZnS Quantum Dot Heterostructure
Author(s) -
Chen Weiwei,
Hao Jiongyue,
Hu Wei,
Zang Zhigang,
Tang Xiaosheng,
Fang Liang,
Niu Tianchao,
Zhou Miao
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201604085
Subject(s) - heterojunction , perovskite (structure) , materials science , photoluminescence , quantum dot , optoelectronics , diode , light emitting diode , doping , density functional theory , photovoltaic system , chemistry , crystallography , computational chemistry , ecology , biology
All‐inorganic perovskite CsPbX 3 (X = Cl, Br, I) and related materials are promising candidates for potential solar cells, light emitting diodes, and photodetectors. Here, a novel architecture made of CsPbX 3 /ZnS quantum dot heterodimers synthesized via a facile solution‐phase process is reported. Microscopic measurements show that CsPbX 3 /ZnS heterodimer has high crystalline quality with enhanced chemical stability, as also evidenced by systematic density functional theory based first‐principles calculations. Remarkably, depending on the interface structure, ZnS induces either n‐type or p‐type doping in CsPbX 3 and both type‐I and type‐II heterojunctions can be achieved, leading to rich electronic properties. Photoluminescence measurement results show a strong blue‐shift and decrease of recombination lifetime with increasing sulfurization, which is beneficial for charge diffusion in solar cells and photovoltaic applications. These findings are expected to shed light on further understanding and design of novel perovskite heterostructures for stable, tunable optoelectronic devices.