基于Bi_(2)O_(3)/g-C_(3)N_(4)复合材料的自供能紫外探测器的制备及性能研究  

Preparation and Performance of the Self-powered Ultraviolet Photodetector Based on the Bi_(2)O_(3)/g-C_(3)N_(4)Composite

作　　者：方向明[1] 周起成 郭庄鹏 朱恩科 郝瑜睿 高世勇[2] FANG Xiangming;ZHOU Qicheng;GUO Zhuangpeng;ZHU Enke;HAO Yurui;GAO Shiyong(Department of Materials and Chemical Engineering,Taiyuan University,Taiyuan 030032,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]太原学院材料与化学工程系,太原030032 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《光子学报》2024年第7期107-115,共9页Acta Photonica Sinica

基　　金：国家重点研发计划(No.2019YFA0705201),中央高校基本科研业务费专项资金资助项目(No.HIT.DZJJ.2023002),山西省高等学校科技创新项目(No.2022L590),太原学院校级一般科研项目(No.23TYYB09)。

摘　　要：为了获得高性能的自供能紫外探测器,结合热聚法和溶液法成功制备了Bi_(2)O_(3)/g-C_(3)N_(4)复合材料,并对其微观形貌、晶体结构、元素组成及价态进行了表征。结果表明,Bi_(2)O_(3)呈蜂窝状结构的块体,其附着在具有层状结构的g-C_(3)N_(4)纳米片上。基于该异质结制备了无需外加偏压即能工作的紫外探测器。在紫外光照射下,Bi_(2)O_(3)/g-C_(3)N_(4)光电探测器能够立即产生光电流并达到最大稳定值约0.43μA,相比于Bi_(2)O_(3)纳米块紫外探测器,其光电流提升了约1.05倍。值得注意的是,Bi_(2)O_(3)/g-C_(3)N_(4)紫外探测器还展现出了快的响应速度(约181.7 ms),并且其光电流与入射光强也具有良好的线性关系,表明该器件对不同强度的紫外光均能实现快速且稳定的探测。Self-powered Ultraviolet(UV)photodetectors have attracted great attention for the fast detection of UV light without external bias voltage,as well as for their high sensitivity,light weight and low energy consumption.In order to obtain high-performance self-powered UV photodetector,Bi_(2)O_(3)nanoblocks and g-C_(3)N_(4)nanosheets were synthesized by thermal polymerization method.Subsequently,Bi_(2)O_(3)/g-C_(3)N_(4)composites were prepared via solution method,and their morphology,crystal structure,chemical composition and valance state were characterized.The results of morphological characterization show that Bi_(2)O_(3)present as a honeycomb-structured block,which are attached to the surface of g-C_(3)N_(4)nanosheets with layered structure.The characteristic peaks of Bi_(2)O_(3)nanoblocks and g-C_(3)N_(4)nanosheets can be observed in the XRD pattern of the as-prepared composite,indicating successfully constructing of the Bi_(2)O_(3)/g-C_(3)N_(4)heterojunction.Further,XPS measurement of the Bi_(2)O_(3)/g-C_(3)N_(4)composite was performed to study the valence states of the elements compositing the composite,in which the results of high-resolution XPS of Bi 4f,O 1s,C 1s and N 1s also confirm the prepared composite as Bi_(2)O_(3)/g-C_(3)N_(4)heterojunction.Based on the as-prepared Bi_(2)O_(3)/g-C_(3)N_(4)heterojunction,the UV photodetector that can operate without an external power source was fabricated.At zero bias voltage,the photodetection performance of the Bi_(2)O_(3)/g-C_(3)N_(4)UV photodetector was investigated under darkness and UV illumination by repeating 10 s with light on and 10 s with light off.When irradiated with UV light,the Bi_(2)O_(3)/g-C_(3)N_(4)UV photodetector immediately generates photocurrent and rapidly rises to the maximum value(0.43μA)and remain stable.After turning off the UV light,the photocurrent immediately decreases and returns to the initial state.Notably,the maximum photocurrent of the device remains essentially unchanged after 7 cycles,indicating that the Bi_(2)O_(3)/g-C_(3)N_(4)UV

关 键 词：紫外探测器 自供能 Bi_(2)O_(3)纳米块 g-C_(3)N_(4)纳米片 异质结 

分 类 号：TN36[电子电信—物理电子学]