4.7 Article

Urea Derivative-Promoted CsPbl2Br Perovskite Solar Cells with High Open-Circuit Voltage

Journal

SOLAR RRL
Volume 6, Issue 6, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202101057

Keywords

energy loss; inorganic perovskites; lattice distortion; perovskite solar cells; urea

Funding

  1. National Natural Science Foundation of China [22088102, 51973223, 61804153]
  2. DICP [ZZBS201714, 2019-MS-325, DICP I202011]
  3. Dalian Youth Science and Technology Star [2020RQ036]
  4. Chinese Academy of Science

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Urea and methyl-substituted urea additives are used to modulate the lattice structure and crystallinity of inorganic perovskite solar cells, resulting in improved stability and device performance.
Inorganic perovskite solar cells (PSCs) have witnessed extraordinary advances owing to their prominent stability against thermal aging. However, they suffer from a phase transition from black phase to yellow phase under ambient conditions and serious energy losses relative to the optical bandgap. Herein, urea (Ur) and methyl-substituted urea (Me-Ur) additives are used to modulate the lattice structure and crystallinity of the CsPbI2Br, facilitating phase stability and high device performance. The Me-Ur can attenuate the strong hydrogen bonding networks in the Ur, which leads to stronger coordination of the carbonyl group with undercoordinated Pb2+, more efficiently passivating the defect states and suppressing the lattice distortion of the [PbI6](4-) octahedra in the CsPbI2Br perovskite. Consequently, a champion power conversion efficiency of 16.5% with an open-circuit voltage up to 1.33 V is obtained for the CsPbI2Br+Me-Ur-based PSCs, accompanied by enhanced stability under continuous illumination at a temperature of 45 +/- 5 degrees C. These results emphasize the importance of regulating the lattice distortion by the urea derivative to implement efficient and stable inorganic CsPbI2Br PSCs.

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