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In high performance perovskite based solar cells, CH3NH3PbI3 is the keymaterial. We carried out a study on charge diffusion in spin-coated CH3NH3PbI3perovskite thin film by transient fluorescent spectroscopy. Athickness-dependent fluorescent lifetime was found. By coating the film with anelectron or hole transfer layer, [6,6]-phenyl-C61-butyric acid methyl ester(PCBM) or 2,2,7,7-tetrakis(N,N-di-p-methoxyphenylamine)-9,9-spirobifluorene(Spiro-OMeTAD) respectively, we observed the charge transfer directly throughthe fluorescence quenching. One-dimensional diffusion model was applied toobtain long charge diffusion distances in thick films, which is ~1.7 um forelectrons and up to ~6.3 um for holes. Short diffusion distance of few hundredsof nanosecond was also observed in thin films. This thickness dependent chargediffusion explained the formerly reported short charge diffusion distance (~100nm) in films and resolved its confliction to thick working layer (300-500 nm)in real devices. This study presents direct support to the high performanceperovskite solar cells and will benefit the devices design.

Direct Observation of Long Electron-Hole Diffusion Distance in CH3NH3PbI3 Perovskite Thin Film