一种基于ZnS量子点的肖特基结日盲紫外探测器, 通过溶液工艺制备而成。其中ZnS量子点为立方闪锌矿结构, 平均直径2.2 nm, 禁带宽度约4.53 eV(立方闪锌矿ZnS体材料为3.68 eV)。器件对日盲波段有较好的光电响应特性, 在15 V偏压下对于光功率密度0.1 mW·cm-2的254 nm紫外光的开关比为9.2, 响应度1.60 mA/W, 探测率5.5×109 cm Hz1/2 W-1。由于器件电阻较大, 响应时间约1秒。实验结果表明, 基于2 nm直径ZnS量子点的光电探测器, 在日盲紫外波段有很好的应用和发展潜力。

Solar-blind ultraviolet schottky barrier photodetectors based on colloidal ZnS quantum-dots were fabricated by solution processing. The cubic ZnS quantum-dots have an average particle size of 2.2 nm, and the bandgap was found to be 4.53 eV (~3.68 eV for bulk cubic ZnS). The photodetector showed an effective photoresponse for the solar-blind ultraviolet (UV) radiation. An on/off ratio of 9.2, responsivity of 1.60 mA/W and detectivity of 5.51×109 cm Hz1/2 W-1 were obtained under 254 nm radiation of 0.1 mWcm2, when operated at a bias voltage of 15 V. The response time of this device was of the order of 1 second, limited by the high resistance of the device. The results indicate that the photodetector using 2 nm ZnS quantum-dots is a promising candidate for solar-blind UV sensing.