The influence of additives in the stoichiometry of hybrid lead halide perovskites

TL;DR

This study explores how solvent additives, especially benzaldehyde, influence the stoichiometry, morphology, and performance of hybrid lead halide perovskite solar cells, leading to improved device efficiency.

Contribution

It demonstrates that benzaldehyde as an additive helps preserve precursor stoichiometry and enhances film quality and device performance in perovskite photovoltaics.

Findings

Benzaldehyde preserves precursor stoichiometry.

Additive improves film morphology.

Device efficiency is enhanced.

Abstract

We investigate the employment of carefully selected solvent additives in the processing of a commercial perovskite precursor ink and analyze their impact on the performance of organometal trihalide perovskite photovoltaic devices. We provide evidence that the use of benzaldehyde can be used as an effective method to preserve the stoichiometry of the perovskite precursors in solution. Benzaldehyde based additive engineering shows to improve perovskite solid state film morphology and device performance of trihalide perovskite based solar cells.