Abstract
Abstract ZnO thin films prepared by spin-coating of nanoparticles at low temperature were utilized as the electron collection layer in CH3NH3PbI3-based perovskite solar cells having a planar heterojunction structure. The thickness of ZnO layer as a key parameter to determine the photovoltaic performance was optimized. The highest power conversion efficiency of up to 13.9% with small hysteretic behavior of current–voltage curves was achieved under AM 1.5 illumination (100 mW cm−2). The ZnO-based devices exhibited significantly improved durability as compared to the control device with exposure to the ambient air environment.
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