Fig. 4From: Evolution of Photoluminescence, Raman, and Structure of CH3NH3PbI3 Perovskite Microwires Under Humidity ExposureX-ray diffraction pattern evolution of MAPbI3 MWs after humidity exposure. a As-prepared sample, b after 5 days at 80% RH and c after 14 days at 80% RH. The red dash lines connecting peaks along the three patterns represent the main perovskite reflections for the tetragonal phaseBack to article page