首页|Stabilizing perovskite precursors with the reductive natural amino acid for printable mesoscopic perovskite solar cells
Stabilizing perovskite precursors with the reductive natural amino acid for printable mesoscopic perovskite solar cells
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Solution processability significantly advances the development of highly-efficient perovskite solar cells.However,the precursor solution tends to undergo irreversible degradation reactions,impairing the device performance and reproducibility.Here,we utilize a reductive natural amino acid,N-acetylcysteine(NALC),to stabilize the precursor solution for printable carbon-based hole-conductor-free mesoscopic perovskite solar cells.We find that I2 can be generated in the aged solution containing methylammonium iodide(MAI)in an inert atmosphere and speed up the MA-FA+(formamidinium)reac-tion which produces large-size cations and hinders the formation of perovskite phase.NALC effectively stabilizes the precursor via its sulfhydryl group which reduces I2 back to I-and provides H+.The NALC-stabilized precursor which is aged for 1440 h leads to devices with a power conversion efficiency equivalent to 98％of that for devices prepared with the fresh precursor.Furthermore,NALC improves the device power conversion efficiency from 16.16％to 18.41％along with enhanced stability under atmo-spheric conditions by modifying grain boundaries in perovskite films and reducing associated defects.
Perovskite solar cellsPerovskite precursorDegradationStabilizationReductive natural amino acid
Michael Grätzel Center for Mesoscopic Solar Cells,Wuhan National Laboratory for Optoelectronics,Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education Huazhong University of Science and Technology,Wuhan 430074,Hubei,China
School of Chemistry,Xi'an Key Laboratory of Sustainable Energy Materials Chemistry,State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an 710049,Shaanxi,China
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