Iodide Management and Oriented Crystallization Modulation for High-Performance All-Air Processed Perovskite Solar Cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 39449237.
- Also identified by DOI 10.1002/adma.202411721.
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Abstract
Halide-related defects at the buried interface not only cause nonradiative recombination, but also seriously impair the long-term stability of perovskite solar cells (PSCs). Herein, a bottom-up, all-in-one modification strategy is proposed by introducing a multisite antioxidant ergothioneine (EGT) at the buried interface to manage iodide ions and manipulate crystallization dynamics. The findings demonstrate that EGT not only passivates uncoordinated Sn<sup>4+</sup>/Pb<sup>2+</sup> defects, but also firmly anchors iodide ions and inhibits their oxidation to I<sub>2</sub>. Additionally, the modification by EGT enhances the oriented crystallization of perovskite, improves the carrier dynamics, and releases residual stresses. Consequently, the optimized all-air processed device (Rb<sub>0.02</sub>(FA<sub>0.95</sub>Cs<sub>0.05</sub>)<sub>0.98</sub>PbI<sub>2.91</sub>Br<sub>0.03</sub>Cl<sub>0.06</sub>) achieves a remarkable power conversion efficiency (PCE) of 25.13%, which is among the highest values reported for devices fabricated in air, along with ultrahigh open-circuit voltage (V<sub>OC</sub>) of 1.191 V and fill factor (FF) of 84.9%. The optimized device without encapsulation exhibits strong humidity, thermal, and operational stability under ISOS protocol. Specifically, the initial efficiency of the device is retained at 90.12% after 1512 h of thermal ageing at 65 °C and 90.14% after 930 h of continuous maximum power point tracking (MPPT) under simulated AM1.5 illumination.