Flexible all-perovskite tandem solar cells approaching 25% efficiency with molecule-bridged hole-selective contact

作者：Li, Ludong; Wang, Yurui; Wang, Xiaoyu; Lin, Renxing; Luo, Xin; Liu, Zhou; Zhou, Kun; Xiong, Shaobing; Bao, Qinye; Chen, Gang; Tian, Yuxi; Deng, Yu; Xiao, Ke; Wu, Jinlong; Saidaminov, Makhsud I.; Lin, Hongzhen; Ma, Chang-Qi; Zhao, Zhisheng; Wu, Yingju; Zhang, Lijun^*; Tan, Hairen^*

来源：Nature Energy, 2022, 7(8): 708-717.

DOI：10.1038/s41560-022-01045-2

• LOW-TEMPERATURE
• NICKEL-OXIDE
• NIOX
• PASSIVATION
• PERFORMANCE
• LAYER
• FILMS

Lightweight flexible perovskite solar cells are promising for building integrated photovoltaics, wearable electronics, portable energy systems and aerospace applications. However, their highest certified efficiency of 19.9% lags behind their rigid counterparts (highest 25.7%), mainly due to defective interfaces at charge-selective contacts with perovskites on top. Here we use a mixture of two hole-selective molecules based on carbazole cores and phosphonic acid anchoring groups to form a self-assembled monolayer and bridge perovskite with a low temperature-processed NiO nanocrystal film. The hole-selective contact mitigates interfacial recombination and facilitates hole extraction. We show flexible all-perovskite tandem solar cells with an efficiency of 24.7% (certified 24.4%), outperforming all types of flexible thin-film solar cell. We also report 23.5% efficiency for larger device areas of 1.05 cm(2). The molecule-bridged interfaces enable significant bending durability of flexible all-perovskite tandem solar cells that retain their initial performance after 10,000 cycles of bending at a radius of 15 mm. @@@ The efficiency of flexible perovskite solar cells lags behind their rigid counterparts. Now, Li et al. devise a self-assembled monolayer bridged hole-selective contact with reduced defects and improved bending durability, achieving a 24.4% certified efficiency.

• 单位
  燕山大学; 吉林大学; 中国科学院; 南京大学; i