摘要
日盲紫外探测器性能的高低,取决于半导体材料质量的优劣。因此,开发高质量的具有日盲紫外光吸收能力的半导体材料,是构建高性能日盲紫外探测器的关键。利用溶剂热法制备出厚度约2.2 nm,宽度约400 nm~4μm的超薄ZnS纳米片。该纳米片在279 nm处具强烈吸收峰,带隙值约4.44 eV,表明其具有日盲紫外光吸收能力。基于该纳米片良好的日盲吸收性质,将其作为光敏活性层构建了自供能光电化学型日盲紫外光探测器。该探测器展示了较好的日盲紫外光选择性[日盲光/紫外光(R279 nm/R290 nm)抑制比约为43]、优良的响应性能[光电流/暗电流开关比约为3500、响应性为1.4 mA/W、上升/衰减时间(约0.3/0.4 s)、探测率为1.7×10^(12) Jones]和良好的稳定性,表明该无机ZnS材料在探测、火灾监测和光通信等领域中具有很大的应用潜力。
The performance of solar-blind UV photodetectors depends on the quality of semiconductor materials.Therefore,the development of high-quality semiconductor materials with solar-blind ultraviolet(UV)absorption ability is the key to build high-performance solar-blind UV photodetectors.The experiment uses a solvothermal strategy to synthesize ultrathin ZnS nanosheets with thickness of 2.2 nm and size of 400 nm~4μm.Notably,these ZnS nanosheets display a sharp and strong absorption peak at ca.279 nm and a bandgap of ca.4.44 eV,indicating their ability to absorb solar-blind UV light.Considering their unique absorption properties,the as-prepared ZnS nanosheets are utilized as photoactive elements to fabricate self-powered photoelectrochemical-type photodetectors for detecting solar-blind UV light.These photodetectors exhibit excellent spectral selectivity(i.e.,the solar-blind/UV(R275 nm/R290 nm)rejection ratios of ca.43),response performance(i.e.,the on/off ratio of 3500,the photoresponsivity of 1.4 mA/W,the rise/decay time(0.3 s/0.4 s),the detectivity of 1.7×10^(12)Jones)and long-term stability.These high-performance solar-blind UV photodetectors shows that inorganic ZnS materials have great potential in the fields of detection,fire monitoring and optical communication.
作者
白欣
齐瑞岳
李冬
BAI Xin;QI Ruiyuec;LI Dong(School of Electrical and Mechanical Engineering,Handan University,Handan 056005,Hebei,China;Handan Key Laboratory of Intelligent Awareness and Application,Handan University,Handan 056005,Hebei,China;College of Chemical Engineering and Materials,Handan University,Handan 056005,Hebei,China;Hebei Center for New Inorganic Optoelectronic Nanomaterial Research,Handan University,Handan 056005,Hebei,China)
出处
《实验室研究与探索》
CAS
北大核心
2024年第12期24-28,共5页
Research and Exploration In Laboratory
基金
国家自然科学基金项目(22171062)
邯郸市科技计划项目(21422111162)
邯郸学院校级项目(J202210,2022xjjg006,XZ2019106)。
关键词
超薄ZnS纳米片
溶剂热法
光电化学型
日盲紫外光探测器
ultrathin ZnS nanosheets
solvothermal strategy
photoelectrochemical type
solarblind UV photodetector
