论文部分内容阅读
We use transient terahertz photoconductivity measurements to demonstrate that upon optical excitation of CH3NH3PbI3 perovskite,the hole transfer from CH3NH3PbI3 into the organic hole-transporting material (HTM) Spiro-OMeTAD occurs on a sub-picosecond timescale.Second-order recombination is the dominant decay pathway at higher photo-excitation fluences as observed in neat CH3NH3PbI3 films.In contrast,under similar experimental conditions,second-order recombination weakly contributes the relatively slow recombination between the electrons in the perovskite and the injected holes in HTM,as a loss mechanism at the CHaNH3PbI3/Spiro-OMeTAD interface.Our results offer insights into the intrinsic photophysics of CHaNHaPbI3-based perovskites with direct implications for photovoltaic devices and optoelectronic applications.