Abstract

Organic-inorganic lead halide perovskites have high power conversion efficiency and intriguing physical-chemical aspects that attract attention of the photovoltaic community. Methylammonium lead iodide (MAPI) is an archetypal material for lead halide perovskites and mixed electronic and ionic conductor. In order to investigate the key features of its performance, we have to consider the electronic transport as well as ionic transport properties. In previous study about perovskite interface, ions are responsible for the equilibrium space charge potential due to ion adsorption at the contact area between MAPI and oxide layers. The surface chemistry of oxide (TiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>) and its interaction with perovskite plays an important role in charge transport in perovskite solar cells. From the perovskite solar cell structure, TiO<sub>2</sub> electron transport layer is being replaced by SnO<sub>2</sub> because of its excellent electrical and optical properties and low-temperature process. Nevertheless, the interfacial effect on charge transport between SnO<sub>2</sub> and MAPI is not well identified. In this study, we investigate the surface chemistry of oxides (SnO<sub>2</sub> and TiO<sub>2</sub>) and interface effects between MAPI and oxide layers. We also observed the interaction between SnO<sub>2</sub> and MAPI by using UV-Vis spectroscopy, ICP, XPS and compared it with TiO<sub>2</sub>. Additionally, we measured the conductivity to understand the charge transport properties by controlling the contact area of MAPI and SnO<sub>2</sub> interface. To optimize the charge transfer in SnO<sub>2</sub> based solar cell, a comparison between compact SnO<sub>2</sub> layer (prepared by ALD) and composite layer (prepared by spin coating) by using various measurements including external quantum efficiency (EQE) and photoluminescence (PL) was also provided. These physical and optical properties were extended to perovskite solar cells which give us evidence on charge extraction and recombination. Our work will provide a better physical understanding of the perovskite solar cell system.

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