Compact TiO2 films with sandwiched Ag nanoparticles as electron-collecting layer in planar type perovskite solar cells: improvement in efficiency and stability |
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| Authors: | Seid Yimer Abate Wen-Ti Wu Someshwar Pola Yu-Tai Tao |
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| Institution: | Institute of Chemistry, Academia Sinica, Nankang, Taipei 115 Taiwan.; Taiwan International Graduate Program (TIGP), Sustainable Chemical Science and Technology (SCST), Academia Sinica, Taipei Taiwan ; Department of Applied Chemistry, National Chiao Tung University, Hsinchu Taiwan ; Department of Chemistry, Nizam College, Osmania University, Hyderabad India |
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| Abstract: | Fabrication of perovskite solar cells (PSCs) in a simple way with high efficiency and stability remains a challenge. In this study, silver nanoparticles (Ag NPs) were sandwiched between two compact TiO2 layers through a facile process of spin-coating an ethanolic AgNO3 solution, followed by thermal annealing. The presence of Ag NPs in the electron-transporting layer of TiO2 improved the light input to the device, the morphology of the perovskite film prepared on top, and eliminated leakage current. Photoluminescence and electron mobility studies revealed that the incorporation of Ag NPs in the ETL of the planar PSC device facilitated the electron–hole separation and promoted charge extraction and transport from perovskite to ETL. Hysteresis-free devices with incorporated Ag NPs gave a high average short-circuit current density (Jsc) of 22.91 ± 0.39 mA cm−2 and maximum power conversion efficiency of 17.25%. The devices also showed enhanced stability versus a control device without embedded Ag NPs. The possible reasons for the improvement are analyzed and discussed.Embedding silver nanoparticles in the compact TiO2 layer effectively improves the efficiency and stability of a perovskite solar cell. |
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