科研之友
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摘要
Visible-infrared dual-modal light harvesting is crucial for various optoelectronic devices, particularly for solar cells and photodetectors. For the first time, this study reports on large 25 cm(3)-volume all-inorganic perovskite CsPbBr3 single crystal (SC) with an emphasis on the observed visible-infrared dual-modal light harvesting and sensing as demonstrated by the highperformance visible-infrared dual-modal photodetectors. First, ultralarge 25 cm(3)-volume CsPbBr3 SC ingots with trapping state density as low as of 1 x 10(9) cm-3 have been achieved by a modified Bridgman growth method. The volume reported here is the largest CsPbX3 (X = Cl, Br, I) all-inorganic perovskite system up to now, and the SC can be facilely cut into SC wafers with a diameter of 25 mm for various optoelectronic devices. Furthermore, these CsPbBr3 SCs exhibit a visible absorbance coefficient, a near-infrared (IR) two-phonon absorption coefficient, a carrier diffusion length, and a mobility as high as of 10(5) cm(-1), 3.7 cm per Goeppert-Mayer (GM), 10 mu m and 2000 cm(2) V-1 s(-1), respectively. These merits match well to the requirements of high-performance Vis-IR dual-modal light harvesting optoelectronic devices, which has been demonstrated by the CsPbBr3 SC photodetectors operated under the irradiation of both visible and IR light sources with light on/ off ratio higher than 10(3). These results demonstrate the CsPbBr3 SCs with high visible-infrared dual-modal light harvesting capability and excellent electrical transporting properties have a huge potential in various optoelectronic devices, such as solar cells, photodetectors, and lasers.
