Author(s): Tan, FR (Tan, Furui); Saidaminov, MI (Saidaminov, Makhsud I.); Tan, HR (Tan, Hairen); Fan, JZ (Fan, James Z.); Wang, YH (Wang, Yuhang); Yue, SZ (Yue, Shizhong); Wang, XT (Wang, Xiaotian); Shen, ZT (Shen, Zhitao); Li, SJ (Li, Shengjun); Kim, J (Kim, Junhwan); Gao, YY (Gao, Yueyue); Yue, GT (Yue, Gentian); Liu, R (Liu, Rong); Huang, ZR (Huang, Ziru); Dong, C (Dong, Chen); Hu, XD (Hu, Xiaodong); Zhang, WF (Zhang, Weifeng); Wang, ZJ (Wang, Zhijie); Qu, SC (Qu, Shengchun); Wang, ZG (Wang, Zhanguo); Sargent, EH (Sargent, Edward H.)

Source: ADVANCED FUNCTIONAL MATERIALS Article Number: 2005155 DOI: 10.1002/adfm.202005155 Early Access Date: SEP 2020

Abstract: Charge recombination due to interfacial defects is an important source of loss in perovskite solar cells. Here, a two-sided passivation strategy is implemented by incorporating a bilinker molecule, thiophene-based carboxylic acid (TCA), which passivates defects on both the perovskite side and the TiO(2)side of the electron-extracting heterojunction in perovskite solar cells. Density functional theory and ultrafast charge dynamics reveal a 50% reduction in charge recombination at this interface. Perovskite solar cells made using TCA-passivated heterojunctions achieve a power conversion efficiency of 21.2% compared to 19.8% for control cells. The TCA-containing cells retain 96% of initial efficiency following 50 h of UV-filtered MPP testing.

Accession Number: WOS:000566370300001

ISSN: 1616-301X

eISSN: 1616-3028

Full Text: https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.202005155