Enhancing the stability of formamidinium lead iodide solar cells using FAI·PbI2 powder and silicon quantum dots

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Svrcek, Vladimir and Kambley, Ankur and Mierzaaihemaiti, Abuduhebaier and McDonald, Calum and Mariotti, Davide and Murakami, Takurou N. and Matsui, Takuya; (2025) Enhancing the stability of formamidinium lead iodide solar cells using FAI·PbI2 powder and silicon quantum dots. In: 2025 IEEE 53rd Photovoltaic Specialists Conference (PVSC). 2025 IEEE 53rd Photovoltaic Specialists Conference (PVSC) . IEEE, CAN, pp. 58-60. ISBN 979-8-3315-3444-8 (https://doi.org/10.1109/pvsc59419.2025.11133289)

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Abstract

Intensive research on formamidinium lead iodide (FAPbI3) has led to record-breaking conversion efficiencies, but stability remains a significant challenge. To address this, we focused on synthesizing formamidinium iodide lead iodide powder (P-FAI·PbI2) and incorporating Si quantum dots (QDs) into P-FAPbI3-based films. P-FAI·PbI2 demonstrated improved film stability under light exposure in humid conditions, retaining its color for 108 days, compared to 20 days for FAPbI3 derived from traditional PbI2 precursors. Solar cells fabricated under these conditions exhibited superior stability: FAPbI3 devices based on the traditional PbI2 precursor degraded completely after 24 hours, whereas P-FAI·PbI2-based devices maintained their performance. The addition of Si QDs blended with P-FAI·PbI2 further enhanced stability, reducing color change and degradation in a constant temperature-humid chamber. XRD analysis revealed that homogeneously dispersed Si QDs within the absorption layer help stabilize the α-phase, preventing its transition to the unstable δ-phase.

ORCID iDs

Svrcek, Vladimir, Kambley, Ankur, Mierzaaihemaiti, Abuduhebaier, McDonald, Calum, Mariotti, Davide ORCID logoORCID: https://orcid.org/0000-0003-1504-4383, Murakami, Takurou N. and Matsui, Takuya;
CORE (COnnecting REpositories)