Journal
SMALL
Volume 13, Issue 21, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201604085
Keywords
all-inorganic perovskites; first principles; heterojunction; optical excitation; quantum dots
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Funding
- National Natural Science Foundation of China [11674042, 61520106012, 61674023]
- Young 1000 Talents Program of China [0210002102026]
- Fundamental Research Funds for the Central - Universities [0210005202058]
- Hundred Young Talents Plan at the Chongqing University [0210001104430, 0210001104455]
- SRF for ROCS, SEM [0210002409003]
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All-inorganic perovskite CsPbX3 (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 CsPbX3/ZnS quantum dot heterodimers synthesized via a facile solution-phase process is reported. Microscopic measurements show that CsPbX3/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 CsPbX3 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.
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