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Inorganic perovskite solar cells with very high voltage and excellent stability against thermal and environmental degradation

https://doi.org/10.1109/PVSC48317.2022.9938899

Sharikadze, Saba; Zhu, Junhao; Kottokkaran, Ranjith; Akopian, Arkadi; Dalal, Vikram (June 2022, 2022 IEEE 49th Photovoltaics Specialists Conference (PVSC), Philadelphia, PA, USA)

We report on inorganic CsPbBr 3 solar cells with very high open circuit voltages and excellent environmental stability. The cells were fabricated using vapor deposition. We show that by using an interfacial n-doped CdS (CdS:In) layer between the cell TiO2, we can obtain voltages of ∼1.68 V, the highest ever reported in vapor deposited CsPbBr3 material. A surprising phenomenon was that the crystal structure of the material, and the apparent bandgap, changed when a thicker CdS:In layer was used as the n layer. We also show that there is little environmental degradation in performance for a cell kept for 600 hours in room air, and even for a cell kept at 200 °C for 24 hours in air. The cells were deposited using sequential deposition in vacuum followed by anneals at 450 °C. We study both organic p layers (P3HT) and inorganic p layers (paste coated C).

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