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The fabrication of high-quality organic-inorganic hybrid halide perovskitelayers is the key prerequisite for the realization of high efficient photonenergy harvest and electric energy conversion in their related solar cells. Inthis article, we report a novel fabrication technique of CH3NH3PbI3 layer basedon high temperature chemical vapor reaction. CH3NH3PbI3 layers have beenprepared by the reaction of PbI2 films which were deposited by pulsed laserdeposition, with CH3NH3I vapor at various temperatures from 160 oC to 210 oC.X-ray diffraction patterns confirm the formation of pure phase, andphotoluminescence spectra show the strong peak at around 760 nm. Scanningelectron microscopy images confirm the significantly increased average grainsize from nearly 1 {\mu}m at low reaction temperature of 160 oC to more than 10{\mu}m at high reaction temperature of 200 oC. The solar cells were fabricated,and short-circuit current density of 15.75 mA/cm2, open-circuit voltage of 0.49V and fill factor of 71.66% have been obtained.

Preparation of CH3NH3PbI3 thin films with tens of micrometer scale at high temperature