Stabilizing Perovskite Precursor by Synergy of Functional Groups for NiOx‐Based Inverted Solar Cells with 23.5 % Efficiency
Abstract
Perovskite solar cells suffer from poor reproducibility due to the degradation of perovskite precursor solution. Herein, we report an effective precursor stabilization strategy via incorporating 3-hydrazinobenzoic acid (3-HBA) containing carboxyl (-COOH) and hydrazine (-NHNH2) functional groups stabilizer. The oxidation of I-, deprotonation of organic cations and amine-cation reaction are main causes of the degradation of mixed organic cation perovskite precursor solution. The-NHNH2 can reduce I2 defects back to Iand thus suppress the oxidation of I-, while the H + generated by-COOH can inhibit the deprotonation of organic cations and subsequent amine-cation reaction. The above degradation reactions are simultaneously inhibited by the synergy of functional groups. 2 The inverted device achieves an efficiency of 23.5% (certified efficiency of 23.3%) with excellent operational stability, retaining 94% of the initial efficiency after maximum power point tracking for 601 hours.
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