Upgrading Spiro-OMeTAD with β-Chloroethylcarbazole to Improve the Stability of Perovskite Solar Cells
By
Wang, JL (Wang, Jialin) [1] , [2] , [3] , [4] , [5] , [6] ; Lu, HZ (Lu, Haizhou) [6] , [10] ; Liu, YH (Liu, Yuhang) [6] ; Wang, PY (Wang, Pengyang) [1] , [2] , [3] , [4] , [5] ; Wang, SL (Wang, Sanlong) [1] , [2] , [3] , [4] , [5] ; Dong, XY (Dong, Xiyue) [3] , [7] , [8] , [9] ; Zhao, Y (Zhao, Ying) [1] , [2] , [3] , [4] , [5] ; Liu, YS (Liu, Yongsheng) [3] , [7] , [8] , [9] ; Grätzel, M (Gratzel, Michael) [1] , [6] ; Zhang, XD (Zhang, Xiaodan) [1] , [2] , [3] , [4] , [5]
(provided by Clarivate)
DOI
10.1021/acsenergylett.4c02507
Early Access
DEC 2024
Indexed
2024-12-19
Document Type
Article; Early Access
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Abstract
Spiro-OMeTAD has served as a crucial hole transporting material (HTM) in the advancement of efficient perovskite solar cells (PSCs). However, the diminished thermal stability of lithium-doped Spiro-OMeTAD (Li-Spiro) has been a limiting factor, leading to a significant decline of the power conversion efficiency (PCE) and stability, particularly at a temperature exceeding 65 degrees C. Here, we report an upgraded HTM, Spiro-OMeCzCl, by incorporating chloroethyl-modified carbazole units to expand the conjugated area of the donor group. This novel configuration significantly enhances the thermal stability and film quality. The resulting PSCs utilizing Spiro-OMeCzCl achieved a high PCE of 24.6%, coupled with exceptional long-term stability. The target cells maintained approximately 95% of their initial PCE after 57 days under a nitrogen atmosphere. Importantly, in subsequent thermal stability tests involving a gradual temperature increase, the cells sustained an average PCE of over 85% after 200 h at temperatures ranging from 60 to 90 degrees C.
