4-Iodo-1H-imidazole dramatically improves the open-circuit voltages of perovskite solar cells to 1.2 V?

New Journal of Chemistry Pub Date: 2023-04-26 DOI: 10.1039/D3NJ01146A

Abstract

Although the efficiency of perovskite solar cells is over 25%, there is still a big difference between the open-circuit voltage and its theoretical value, which is ascribed to defects in the perovskite films. Here, 4-iodo-1H-imidazole is introduced into a perovskite precursor to prevent defect formation in final films. The open-circuit voltage is significantly elevated to 1.209 V from 1.085 V. 4-Iodo-1H-imidazole, as a kind of small organic molecule, can not only reduce pin-holes in perovskite films by participating in the growth of perovskite crystals, but also suppress the generation of defects, resulting in decreased nonradiative recombination. Finally, the device efficiency becomes 21.68%, which is increased by 20% in comparison with that of the control device (17.87%).

Graphical abstract: 4-Iodo-1H-imidazole dramatically improves the open-circuit voltages of perovskite solar cells to 1.2 V
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