Inch-Size Single Crystal of a Lead-Free Organic-Inorganic Hybrid Perovskite for High-Performance Photodetector

Large-size crystals of organic-inorganic hybrid perovskites (e.g., CH3NH3PbX3, X = Cl, Br, I) have gained wide attention since their spectacular progress on optoelectronic technologies. Although presenting brilliant semiconducting properties, a serious concern of the toxicity in these lead-based hybrids has become a stumbling block that limits their wide-scale applications. Exploring lead-free hybrid perovskite is thus highly urgent for high-performance optoelectronic devices. Here, a new lead-free perovskite hybrid (TMHD) BiBr5 (TMHD = N, N, N, N-tetramethyl-1,6-hexanediammonium) is prepared from facile solution process. Emphatically, inch-size high-quality single crystals are successfully grown, the dimensions of which reach up to 32 x 24 x 12 mm(3). Furthermore, the planar arrays of photodetectors based on bulk lead-free (TMHD) BiBr5 single crystals are first fabricated, which shows sizeable on/off current ratios (approximate to 10(3)) and rapid response speed (tau(rise) = 8.9 ms and tau(decay) = 10.2 ms). The prominent device performance of (TMHD) BiBr5 strongly underscores the lead-free hybrid perovskite single crystals as promising material candidates for optoelectronic applications.