[16p-C41-1~12] New direction of perovskite solar cells

4:30 PM - 4:45 PM JST(7:30 AM - 7:45 AM UTC)English Presentation

[16p-C41-6] Understanding the stability of perovskite solar cells through an adlayer of FAPbI₃ quantum dots.

〇Svrcek Vladimir¹, Bruno Alessi¹, Zhihao Xu¹, Calum McDonald¹, Takuya Matsui¹ (1.AIST Tsukuba)

Keywords:

quantum dots,perovskites,solar cell

To enhance the stability of Formamidinium lead iodide (FAPbI₃) hybrid solar cells without compromising efficiency, we propose adding a thin layer of FAPbI₃ quantum dots (QDs) (< 100 nm) on bulk FAPbI₃ film solar cells. We assess the impact of ligands and fs laser-engineered FAPbI₃ QDs on stability and performance. By controlling particle size and transport properties through synthesis and ligand engineering, we increase the energy gap of FAPbI₃ QDs. Substituting Octadecene with Octene as the solvent at the same injection temperature improves ligand exchange, resulting in superior optical and transport properties. FAPbI₃ QDs with Octene showed better properties in power conversion efficiency, Jsc, and Voc, except for fill factor, which was improved with fs laser treatment. The fs laser-treated FAPbI₃ QDs adlayer enhances the stability of the FAPbI₃ perovskite layer. Unlike films with a QDs adlayer, all parameters for the FAPbI₃ film degraded after storage in the dark and in humid conditions (RH 30 %T=28°C). Our findings show significant stability improvement with the QDs adlayer, especially for fs-treated FAPbI₃ QDs, which also broaden the energy gap and act as a passivation layer. The QDs adlayer slows the alpha to delta transition under light soaking in humid conditions, and fs-treated FAPbI₃ QDs slow down PbI₂ formation.