Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Since the report on the solid-state sensitized solar cell employing MAPbI3 (MA = CH3NH3) perovskite in 2012, following two important pioneer works on perovskite-sensitized solar cells in 2009 and 2011, there has been a surge of interest in perovskite solar cell. We report here highly reproducible perovskite solar cell with mean power conversion efficiency (PCE) exceeding 19% and best PCE exceeding 20% via well-defined adduct approach. In a basic embodiment, the device includes a MAPbI3 layer with small fraction of mesoprous TiO2 layer and a spiro-MeOTAD hole transport layer. The Lewis base adducts of PbI2 was found to yield high quality pinhole free MAPbI3 film at ambient condition, leading to high photocurrent and voltage. Compared to conventional methods, Lewis base adduct approach showed higher charge exteration ability as evidenced by photo-CELIV measurement. Furthermore, molecular-level interfacial nanoengineering improved fill factor significantly. Hysteresis-free perovskite solar cell in a normal structure was realized by structural and electronic modifications.
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