Enhanced perovskite solar cell performance via defect passivation with ethylamine alcohol chlorides additive.

Defects easily form in organic-inorganic hybrid perovskite (CH 3 NH 3 PbX 3) absorber layers acting as recombination centers which reduce the performance of solar cells. Therefore, defect passivation is an efficient method to improve the performance of solar cells. Herein, ethylamine alcohol chlorides is introduced into perovskite films to passivate defects. The hydroxyl group and ammonium group in ethylamine alcohol chlorides can interact with halogen in MAPbI x Cl 3-x to form hydrogen bonds suppressing ion migration. In addition, the crosslinking neighbouring perovskite grains through hydrogen bonds can also improve the perovskite grain size and film coverage. The data demonstrate that the obvious reduction of the defect concentration via defect passivation contributes to an enhancement of the open-circuit voltage from 0.87 V to 0.92 V and the device efficiency from 14.52% to 16.97%. • Ethylamine alcohol chlorides were interacted with perovskite to form hydrogen bonds. • The hydrogen bond interaction suppressed ion migration and passivated defects. • The crosslinking perovskite grains improved the grain size and film coverage. • Defect passivation contributes to enhancement of solar cell performance. [ABSTRACT FROM AUTHOR]