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Tri‐Brominated Perovskite Film Management and Multiple‐Ionic Defect Passivation for Highly Efficient and Stable Solar Cells.
- Source :
- Solar RRL; Apr2021, Vol. 5 Issue 4, p1-11, 11p
- Publication Year :
- 2021
-
Abstract
- High‐quality perovskite films with low imperfections, high hole mobility, and matching energy levels play a crucial role in enhancing performance of perovskite solar cells (PSCs) without hole‐transporting materials (HTMs). Herein, it is demonstrated that the incorporation of a stable tetra‐bisphenol A (TBBPA) with diphenyl ring, polybromides, and hydroxyl groups additive into a perovskite film can simultaneously manipulate the crystal growth and passivate the defects through coordination interaction between the functional group (OH, Br) and the unsaturated halogen and metal ions (Br−, Cs+, and Pb2+), resulting in a reduced grain boundary as well as imperfection and increased hole mobility of the CsPbBr3 perovskite film. In addition, the valence band of a perovskite film with TBBPA additive is shifted upward to approach the work function of the carbon electrode, thereby improving the energy level alignment. Consequently, a significantly boosted charge extraction and reduced charge recombination of the carbon‐based HTM‐free CsPbBr3 PSCs is obtained after incorporating the TBBPA additive, yielding a maximum power conversion efficiency of up to 9.82% of the optimized device. Furthermore, the champion PSC without encapsulation displays a remarkable thermal and moisture stability after being kept in ambient air for 720 h at 85 °C and 85% relative humidity, respectively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 2367198X
- Volume :
- 5
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Solar RRL
- Publication Type :
- Academic Journal
- Accession number :
- 149664662
- Full Text :
- https://doi.org/10.1002/solr.202000819