Core/shell AgNWs@SnOx electrodes for high performance flexible indoor organic solar cells with >25% efficiency

摘要

In this work, an inorganic semiconductor SnOx has grown on the surface of silver nanowires (AgNWs) to form core/shell electrodes, which was successfully applied into flexible indoor organic solar cells (OSCs). Based on the redox reaction between Sn2+ and Ag+, the pristine AgNWs thin films were treated by SnCl2 in an aqueous so-lution, so that SnOx was generated and meanwhile the defect on the surface of AgNWs (ex. Ag+ and poly-vinylpyrrolidone) was removed. SnOx can not only improve the stability, but also more importantly, tune the work function of AgNWs due to its n-type semiconducting nature. Therefore, photogenerated charges were efficiently injected and collected at the electrode. With this AgNWs@SnOx electrode, flexible indoor OSCs provided a high efficiency of 25.51% under 1000 lux illumination, while the unmodified AgNWs electrode only showed an efficiency of 18.84%.

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