Two-step growth of CsPbI3-xBrx films employing dynamic CsBr treatment: toward all-inorganic perovskite photovoltaics with enhanced stability
- Authors
- Parida, Bhaskar; Ryu, Jun; Yoon, Saemon; Lee, Seojun; Seo, Yejin; Cho, Jung Sang; Kang, Dong-Won
- Issue Date
- Aug-2019
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.7, no.31, pp 18488 - 18498
- Pages
- 11
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 7
- Number
- 31
- Start Page
- 18488
- End Page
- 18498
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/36390
- DOI
- 10.1039/c9ta05948b
- ISSN
- 2050-7488
2050-7496
- Abstract
- Recently, CsPbI3-xBrx (x = 1-2) all-inorganic perovskites have been studied to overcome the phase instability of CsPbI3. However, the addition of Br inevitably leads to a bandgap that is too wide (1.93-2.03 eV) compared to that of CsPbI3 (1.73 eV). To avoid this, the present study focuses on developing stable alpha-CsPbI3-xBrx (x < 0.7) perovskite films with lower Br levels. Our dynamic CsBr treatment incorporates Br- into the CsPbI3 lattice, greatly enhancing the morphology, optical properties, stability, and photovoltaic performance of the resultant CsPbI3-xBrx (x < 0.7) perovskite films. At x = 0.66, the perovskite film with the relatively low bandgap of 1.84 eV contributes to achieving an impressive power conversion efficiency (PCE) of 14.08% and, after 1200 h storage under a nitrogen atmosphere without encapsulation, the PCE remains at around 70% of this initial level. This two-step growth using dynamic CsBr treatment opens up promising routes for the feasible fabrication of inorganic perovskite photovoltaics with exceptional stability.
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