Large-Size CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Single Crystal: Growth and In Situ Characterization of the Photophysics Properties Pengjun Zhao Jinbao Xu Xiaoyu Dong Lei Wang Wei Ren Liang Bian Aimin Chang 10.1021/acs.jpclett.5b01017.s001 https://acs.figshare.com/articles/journal_contribution/Large_Size_CH_sub_3_sub_NH_sub_3_sub_PbBr_sub_3_sub_Single_Crystal_Growth_and_In_Situ_Characterization_of_the_Photophysics_Properties/2051619 We reported a facile single-solution fabrication method to grow large-scale CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> hybrid perovskite single crystal at room temperature. The obtained single crystal in this experiment was 14 × 14 mm. The sample’s in situ photophysics properties under dark and illumination, including the surface morphology, work function, surface current distribution, microcosmic <i>I</i>–<i>V</i> curves, as well as the polarization behavior, were in situ characterized by integrated utilization of a scanning probe microscopy, respectively. Piezoresponse force microscopy (PFM) phase angles indicated the existence of “polarization” in CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> lattice. Interestingly, the “polarization effect” was enhanced by the plus light source. Moreover, a surface potential shift as large as 200 mV was observed under the condition of the illumination on and off. This research is proposed to provide an opportunity to take a fresh look at the architectural design and photovoltaic performance origin of the hybrid perovskite solar cells. 2015-12-17 08:34:59 PFM 200 mV surface morphology illumination photophysics properties perovskite phase angles room temperature polarization behavior light source Situ Characterization Piezoresponse force microscopy work function CH 3NH scanning probe microscopy CH 3NH lattice photovoltaic performance origin Photophysics PropertiesWe crystal