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- Title
The Effect of Cs/FA Ratio on the Long‐Term Stability of Mixed Cation Perovskite Solar Cells.
- Authors
Choi, Dong-Hyeok; Seok, Hae-Jun; Kim, Su-Kyung; Kim, Do-Hyung; Hou, Bo; Kim, Han-Ki
- 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.
- Subjects
SOLAR cells; PEROVSKITE; LEAD iodide; CATIONS; PHASE transitions; CESIUM compounds
- Publication
Solar RRL, 2021, Vol 5, Issue 12, p1
- ISSN
2367-198X
- Publication type
Article
- DOI
10.1002/solr.202100660