Journal
ADVANCED SCIENCE
Volume 7, Issue 11, Pages -Publisher
WILEY
DOI: 10.1002/advs.201902767
Keywords
CsPbBr3 single crystals; perovskites; cubic ZnO; electron-transport layers; optoelectronic devices
Categories
Funding
- National Natural Science Foundation of China [61875082, 61674074, 61905107]
- National Key Research and Development Program [2017YFE0120400]
- Natural Science Foundation of Guangdong Province [2017B030306010]
- Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting [2017KSYS007]
- High Level University Fund of Guangdong Province [G02236001, G02236402]
- Innovation Project of Department of Education of Guangdong Province [2019KTSCX157]
- Shenzhen Peacock Team Project [KQTD2016030111203005]
- Shenzhen Innovation Project [JCYJ20190809152411655]
- Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting [ZDSYS201707281632549]
- China Scholarship Council (CSC)
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC 2089/1-390776260]
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Directly growing perovskite single crystals on charge carrier transport layers will unravel a promising route for the development of emerging optoelectronic devices. Herein, in situ growth of high-quality all-inorganic perovskite (CsPbBr3) single crystal arrays (PeSCAs) on cubic zinc oxide (c-ZnO) is reported, which is used as an inorganic electron transport layer in optoelectronic devices, via a facile spin-coating method. The PeSCAs consist of rectangular thin microplatelets of 6-10 mu m in length and 2-3 mu m in width. The deposited c-ZnO enables the formation of phase-pure and highly crystallized cubic perovskites via an epitaxial lattice coherence of (100)(CsPbBr3)parallel to(100)(c-ZnO), which is further confirmed by grazing incidence wide-angle X-ray scattering. The PeSCAs demonstrate a significant structural stability of 26 days with a 9 days excellent photoluminescence stability in ambient environment, which is much superior to the perovskite nanocrystals (PeNCs). The high crystallinity of the PeSCAs allows for a lower density of trap states, longer carrier lifetimes, and narrower energetic disorder for excitons, which leads to a faster diffusion rate than PeNCs. These results unravel the possibility of creating the interface toward c-ZnO heterogeneous layer, which is a major step for the realization of a better integration of perovskites and charge carrier transport layers.
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