Journal
SMALL
Volume 16, Issue 52, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202005226
Keywords
anion exchange; bandgap engineering; large scale; phase conversion; precise control
Categories
Funding
- National Natural Science Foundation of China [61604061, 51772135, 11804117, 11774079]
- Natural Science Foundation of Guangdong Province, China [2019A1515010482, 2020A1515011377]
- Fundamental Research Funds for the Central Universities [21618405, 21618313]
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Anion exchange offers great flexibility and high precision in phase control, compositional engineering, and optoelectronic property tuning. Different from previous successful anion exchange process in liquid solution, herein, a vapor-phase anion-exchange strategy is developed to realize the precise phase and bandgap control of large-scale inorganic perovskites by using gas injection cycle, producing some perovskites such as CsPbCl3 which has never been reported in thin film morphology. Ab initio calculations also provide the insightful mechanism to understand the impact of anion exchange on tuning the electronic properties and optimizing the structural stability. Furthermore, because of precise control of specific atomic concentrations, intriguing tunable photoluminescence is observed and photodetectors with tunable photoresponse edge from green to ultraviolet light can be realized accurately with an ultrahigh spectral resolution of 1 nm. Therefore, a new, universal vapor-phase anion exchange method is offered for inorganic perovskite with fine-tunable optoelectronic properties.
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