Bismuth Incorporation Stabilized α-CsPbI 3 for Fully Inorganic Perovskite Solar Cells

All-inorganic CsPbI3 perovskite is emerging to be an alternative light-harvesting material in solar cells owing to the enhanced stability and comparable photovoltaic performance compared to organic–inorganic hybrid perovskites. However, the desirable black phase α-CsPbI3 is not stable at room temperature and degrades rapidly to a nonperovskite yellow phase δ-CsPbI3. Herein, we introduce a compositional engineering approach via incorporating Bi3+ in CsPbI3 to stabilize the α-phase at room temperature. Fully inorganic solar cells based on the Bi-incorporated α-CsPb1–xBixI3 compounds demonstrate a high PCE of 13.21% at an optimal condition (incorporation of 4 mol % Bi3+) and maintain 68% of the initial PCE for…

• NN
  National Natural Science Foundation of China

  Award: 21403112
• MO
  Ministry of Education of the People's Republic of China

  Award: 3091501333
• NS
  Natural Science Foundation of Jiangsu Province

  Award: BK20140778
• PA
  Priority Academic Program Development of Jiangsu Higher Education Institutions