A donor–acceptor-type hole-selective contact reducing non-radiative recombination losses in both subcells towards efficient all-perovskite tandems

Zhu, J., Luo, Y., He, R. et al.

Nat Energy 8, 714–724 (2023).

https://doi.org/10.1038/s41560-023-01274-z

A donor-acceptor molecule, 2F, serves as a hole-selective contact for both wide-bandgap (WBG) and low-bandgap (LBG) perovskite subcells in all-perovskite tandem solar cells. In the WBG cell, 2F extracts holes efficiently and minimizes recombination losses by passivating defects. In the LBG cell, 2F suppresses losses, enhances film quality, and regulates crystal growth. This results in WBG and LBG devices with efficiencies of 19.33% and 23.24%, respectively, contributing to a monolithic all-perovskite tandem solar cell with an efficiency of 27.22%.

How Paios was used

Transient photovoltage (TPV), transient photocurrent (TPC), Mott–Schottky plots and electrochemical impedance spectroscopy were performed using the all-in-one characterization system Paios from Fluxim.