Thermochromism to tune the optical bandgap of a lead-free perovskite-type hybrid semiconductor for efficiently enhancing photocurrent generation

摘要: Thermochromic materials have recently attracted great attention due to their controllable and rich physicochemical properties. However, until now, no studies been reported on thermochromic for photovoltaic optoelectronic applications. Here we report a new lead-free hybrid semiconductor material, (C16H20N2)SbBr5 (1), which adopts the zero-dimensional (0-D) perovskite-type inorganic framework. Strikingly, thermochromism in 1 leads wide tunable bandgap superior photoelectric Three distinct color-varying stages were first observed, i.e. colorless yellow (I), red (II), black brown (III). In particular, figure-of-merits thin-film photodetectors based II-thermochromism greatly improved, with dark current lowered one quarter light photocurrent enhanced at least 12-fold. The on/off switching ratio was thus improved by ∼50 times through thermochromism. As conceptual strategy engineer optical meet specific functions, our study paves way building high-performance devices materials.