Gas induced conversion of hybrid perovskite single crystal to single crystal for great enhancement of their photoelectric properties
Dianxing Ju, Tianyu Zhao, Dang Yangyang, Guodong Zhang, Xiaobo Hu,*
Deliang Cui and Xutang Tao*
J. Mater. Chem. A, 2017, 5, 21919
Abstract: The desired morphology, narrowed band gap and good photoelectric properties are the key factors to achieve widely application of hybrid perovskite materials. During the preparation of novel hybrid perovskite materials, preserving the morphology of highly crystalline materials and narrow their band gap will be desirable for designing photoelectric devices with outstanding performance. Here, with the broadband gap 1D/2D hybrid perovskite single crystals as template, we design a universal conversion process from single crystal to single crystal for a variety of large size hybrid perovskite materials induced by CH3NH2 (MA) gas under an ambient atmosphere. Most significantly, the hybrid perovskite single crystals keep their original morphology, narrow their optical band gap, enhance their carrier mobility and photo-response dramatically after induced by MA gas molecules, especially for the DMAPbI3 (NH2(CH3)2PbI3). The optical band gap of DMAPbI3 was lowered from 2.58 eV to 1.53 eV and its photo-response performance was enhanced greatly even a small amount of replacement of DMA+ by MA+, which provides a new idea to design the novel hybrid perovskite single crystals in desired morphology and their optoelectronic devices with good performance.
