DOI: 10.1126/science.aav8680 ISSN:
Thermodynamically stabilized β-CsPbI 3 –based perovskite solar cells with efficiencies >18%
Yong Wang, M. Ibrahim Dar, Luis K. Ono, Taiyang Zhang, Miao Kan, Yawen Li, Lijun Zhang, Xingtao Wang, Yingguo Yang, Xingyu Gao, Yabing Qi, Michael Grätzel, Yixin Zhao- Multidisciplinary
Tetragonal phases for perovskite solar cells
The power conversion efficiencies (PCEs) of all-inorganic perovskites are lower than those of materials with organic cations. This is in part because these materials have larger bandgaps. The cubic crystal phases of these materials also exhibit poor stability. Wang et al. synthesized the tetragonal β-phase of CsPbI 3 from HPbI 3 and CsI. The material exhibited higher stability and a more favorable bandgap, which allowed for PCEs of 15%. Passivation of the surface trap state with choline iodide boosted PCEs to 18%.
Science
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