Publication date: 9th July 2025
Perovskite solar cells (PSCs) exhibit remarkable efficiency but suffer from rapid degradation when exposed to ambient air, illumination, bias, or elevated temperature, limiting their practical deployment. Additive engineering has emerged as a key strategy to stabilize perovskite devices, yet balancing efficiency gains with robust stability remains challenging.
In this work, we employ chlorine-terminated 2-naphthyl ethylamine hydrochloride as a multifunctional additive to address these issues. The Cl-ligands demonstrate a unique reductive capability, stabilizing the FA0.9Cs0.1PbI2.9Br0.1 precursor solutions (inhibition of iodide oxidation is evident from transparent color, different from oxidized yellow solutions), which mitigates defect formation during crystallization. By optimizing the additive concentration, we achieve uniform and photostability perovskite films also with high humidity resistance. Devices attain a power conversion efficiency (PCE) of 22.2%, slightly surpassing the control group (22%). Crucially, under 25°C and 70% relative humidity, the treated devices retain 93% of their initial PCE after 300 hours, far exceeding the control group (82%). Concentration-dependent experiments further highlight that excess additive will cause a sharp decrease in current, emphasizing the importance of precise optimization.
This study provides a new perspective for enhancing the stability of perovskite devices, providing certain reference significance for the future PSCs.
This work was supported by the Seed Funding for Basic Research and Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong and the RGC GRF projects 17311422
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