Radical Molecular Network-Buffer Minimizes Photovoltage Loss in FAPbI₃ Perovskite Solar Cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 39989119.
- Also identified by DOI 10.1002/adma.202417289.
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Abstract
Formamidinium lead iodide (FAPbI₃) perovskite solar cells (PSCs) hold immense potential for high-efficiency photovoltaics, but maximizing their open-circuit voltage (V<sub>OC</sub>) remains challenging. Targeting the inherently stable {111}<sub>c</sub>-dominant facets is a promising approach for enhancing stability, but their formation typically suffers from high defect densities and disordered growth. This study introduces a novel approach using an in situ polymerizable radical molecule, ATEMPO, as an additive to address these issues. ATEMPO preferentially interacts with the {111}<sub>c</sub> perovskite facets, guiding their growth and forming a "radical molecular network-buffer" upon polymerization. The network effectively mitigates lattice strain, suppresses defect formation, enhances charge transport via redox-mediated hopping, and provides a hydrophobic barrier, significantly improving moisture resistance. This strategy yields high-quality, {111}<sub>c</sub> -oriented FAPbI₃ films, leading to a champion PCE of 25.28% with a remarkably high V<sub>OC</sub> of 1.203 V, corresponding to an energy loss (E<sub>loss</sub>) of only 0.297 eV, among the highest V<sub>OC</sub> reported for FAPbI₃-based PSCs. Furthermore, a mini-module fabricate with an active area of 12.5 cm<sup>2</sup> achieve a high PCE of 21.39%. the work paves the way for developing high-performance, stable PSCs with minimized photovoltage loss. Furthermore, it offers a promising strategy to enhance device longevity and address environmental concerns.