Wide bandgap (WBG) formaldehyde-cesium (FA-Cs) hybrid lead iodide -bromide hybrid perovskites (~1.7 eV) have the potential to enable efficient tandem photovoltaics upon integration with crystalline silicon and other low bandgap solar cells has received widespread attention for its potential to generate electricity. However, due to its high open circuit voltage (VOC) defect (>0.43 V), its power conversion efficiency (PCE ) is still lower than that of methylammonium (MA)-containing perovskite precursors.
Liu Zhun, Fang Zebo, Ye Feng of Shaoxing University of Arts and Sciences and Tie Li of the Chinese Academy of Sciences can significantly optimize the film by adding rubidium iodide (RbI) to the FA0.8Cs0.2Pb(I0.75Br0.25)3 perovskite precursor. Crystallinity and volume defects. Furthermore, a comprehensive interface engineering strategy is proposed to sequentially construct surface heterojunctions and use trioctylphosphine oxide (TOPO), which can significantly passivate grain boundaries and undercoordinated defects, and optimize energy bands. The results show that at 1.685 eV, the MA-free WBG nip solar cell achieves a record efficiency of 23.35% and a VOC as high as 1.30 V (voltage deficit of 0.385 V).
Most importantly, the unencapsulated solar cells also demonstrated impressive air storage stability, operational stability, and thermal stability. In addition, the PCE on 1 cm2 is 19.54% and the PCE on 0.04 cm2 is 21.31%.
Ye, Qiufeng et. al. Suppressing Charge Recombination in Methylammonium-free Wide-bandgap Perovskite Film for High-performance and Stable Perovskite Solar Cells. Energy Environ. Sci. 2024
DOI:10.1039/D4EE00666F
http://dx.doi.org/10.1039/D4EE00666F
E-mail: info@chemborun.com
Tel: +86-574-87178138 
No. 1558, Jiangnan Road,, Ningbo, Zhejiang, China (Mainland)/31
