Journal
CRYSTENGCOMM
Volume 23, Issue 16, Pages 2938-2944Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ce00103e
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Funding
- National Natural Science Foundation of China [52072327, 21673200]
- Zhongyuan Thousand Talents (Zhongyuan Scholars) Program of Henan Province [202101510004]
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Inorganic perovskite CsPbBr3 is a promising candidate for optoelectronic devices due to its outstanding stability and visible light absorption. A single phase CsPbBr3 film was successfully fabricated using an in situ metal reaction strategy in methanol solution, where the thickness of the sputtered Pb film played a crucial role in inhibiting the formation of a secondary CsPb2Br5 phase. The resulting device architecture exhibited a power conversion efficiency of 4.08% and retained over 95% of its initial efficiency after 30 days of storage without packaging in an ambient environment.
Inorganic perovskite CsPbBr3 is a suitable candidate owing to its excellent stability and outstanding visible light absorption. However, it is a huge challenge to fabricate single phase CsPbBr3 films. Herein, we developed an in situ metal reaction strategy to fabricate single phase CsPbBr3 films by reacting Pb precursors with CsBr/HBr in methanol solution. The thickness of the sputtered Pb film plays a key role in inhibiting the formation of a secondary CsPb2Br5 phase. The results indicate that the single phase CsPbBr3 films can be obtained by using below 40 nm of the sputtered Pb films, and the single phase CsPbBr3 device architecture exhibits 4.08% power conversion efficiency. This device can retain over 95% of the initial efficiency after 30 days of storage without packaging in an ambient environment.
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