Building low-dimensional/three-dimensional (LD/3D) perovskite solar cells can improve efficiency and stability. However, the design and selection of LD perovskite capping layers are very scarce for inverted perovskite solar cells (PSCs) because LD perovskite capping layers tend to facilitate hole extraction and hinder electron extraction.
Here, Qiang Fu, Alex K.-Y. Jen of City University of Hong Kong and Liu Yongsheng of Nankai University developed a simple and effective strategy to modify the perovskite surface by adding morpholine hydride ( MORI) and thiomorpholine hydride (SMORI) to passivate surface defects and adjust surface electrical properties. Compared with previously developed PI processing, the one-dimensional (1D) perovskite capping layer derived from PI is converted into a two-dimensional (2D) perovskite capping layer (MORI or SMORI) to achieve size tuning.
The results show that the 2D SMORI perovskite cap layer can induce stronger surface passivation and stronger nN homotype 2D/3D heterojunction, realizing a pin inverted solar cell with an efficiency of 24.55% at the maximum power point ( MPP) still maintains 87.6% of its initial efficiency after 1500 hours of operation. In addition, a 5 × 5 cm2 perovskite micromodule was proposed, achieving an effective area efficiency of 22.28%. In addition, the quantum well structure in the two-dimensional perovskite cap layer increases the moisture resistance of PSCs, inhibits ion migration, and improves the structural and environmental stability of PSCs.
Ting Wang, et al. Dimensional Regulation from 1D/3D to 2D/3D of Perovskite Interfaces for Stable Inverted Perovskite Solar Cells. Journal of the American Chemical Society Article ASAP
DOI: 10.1021/jacs.3c13576
https://doi.org/10.1021/jacs.3c13576