For the past few years, organic-inorganic hybrid perovskite photovoltaic materials have triggered a large scale research campaign for high conversion efficiency solar cells with the certified conversion efficiency over 22% so far. As a key holes transport layer, inorganic materials with high carrier mobility are good candidates to take place of holes transport organic molecules with much lower carrier mobility often involved in the device structures. In this talk, we shall introduce a series of inorganic materials with high transmittance into the devices architecture with p-i-n structure, which is so called “inverted”. Besides of high transmittance for window, these hole-transport films were modulated to fit the energy diagram of the whole device through doping or surface modifications. Systematical photo-physical characterization tools, such as photoluminescence, ultraviolet photo spectroscopy and absorption, and Kelvin probe, were used to analyze the effect of bandgap engineering.
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