The Effect of Cs/FA Ratio on the Long-Term Stability of Mixed Cation Perovskite Solar Cells
- Authors
- Choi, D.-H.[Choi, D.-H.]; Seok, H.-J.[Seok, H.-J.]; Kim, S.-K.[Kim, S.-K.]; Kim, D.-H.[Kim, D.-H.]; Hou, B.[Hou, B.]; Kim, H.-K.[Kim, H.-K.]
- Issue Date
- Dec-2021
- Publisher
- John Wiley and Sons Inc
- Keywords
- cesium; formamidinium; long term; mixed cations; perovskite solar cells; stabilities
- Citation
- Solar RRL, v.5, no.12
- Indexed
- SCIE
SCOPUS
- Journal Title
- Solar RRL
- Volume
- 5
- Number
- 12
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/90416
- DOI
- 10.1002/solr.202100660
- ISSN
- 2367-198X
- Abstract
- Formamidinium lead iodide (FAPbI3) is ideal for highly efficient and operationally stable perovskite solar cells (PSC). However, a primary challenge for FAPbI3 PSC is to suppress the phase transition from the photoactive black phase into the yellow nonperovskite δ-phase. The preparation of Cs-containing mixed FAPbI3 perovskite by cation stoichiometric engineering is demonstrated and the influence of the Cs/FA ratio on its phase stability and device performance is discussed. By exploring the optimal ratio of Cs and FA cations in CsxFA1−xPb(I0.94Br0.06)3 perovskite, an inverted planar device with Cs0.17FA0.83Pb(I0.94Br0.06)3 composition shows the best power conversion efficiency (PCE) of 16.5% in an active area of 1.08 cm2. More importantly, the Cs0.17FA0.83Pb(I0.94Br0.06)3 perovskite photoactive layer showed remarkable long-term stability, maintaining 88.1% of its initial efficiency for 1128 h in the presence of moisture and oxygen and without any encapsulation. The excellent long-term stability is found to originate from the appropriate tolerance factor and low thermodynamic decomposition energy, which underpins the strong potential for the commercialization of Cs-containing mixed FAPbI3 PSCs. © 2021 Wiley-VCH GmbH
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- Appears in
Collections - Engineering > School of Advanced Materials Science and Engineering > 1. Journal Articles
- Graduate School > Advanced Materials Science and Engineering > 1. Journal Articles
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