ZnO Ultraviolet Photodetector Modified with Graphdiyne

doi:10.3866/PKU.WHXB201801251

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	ZnO Ultraviolet Photodetector Modified with Graphdiyne
	Huang Zhijuan 1; Yu Zhinong 1; Li Yan 1; Wang Jizheng 2
刊名	ACTA PHYSICO-CHIMICA SINICA
	2018
卷号	34 期号:9 页码:1088-1094
关键词	Graphdiyne Zinc Oxide Ultraviolet Detector Responsivity Detectivity
ISSN号	1000-6818
DOI	10.3866/PKU.WHXB201801251
英文摘要	ZnO is an ideal material for ultraviolet (UV) detection due to its wide direct-bandgap, high exciton binding energy, and high internal photoconductive gain. However, ZnO UV detectors have the disadvantages of slow response speed and low detectivity. Graphdiyne (GD) is a novel carbonaceous allotrope, and possesses excellent electronic performance in air. In this study, the metal-semiconductor-metal (MSM) structured lateral ZnO UV detectors were prepared, and GD was employed to modify the ZnO surface. The effects of GD deposited 1-3 times (viz. 1T, 2T, and 3T GD) on the performance of ZnO ultraviolet detector were carefully investigated. The results show that the dark current of the bare ZnO detector is 24 mu A under a bias of 10 V, while that of the graphdiyne-modified detector is similar to 0.34 mu A (about two orders of magnitude reduction). The dark current remains almost the same for the 1T, 2T and 3T GD films. The photocurrents of 1-3T GD-modified detectors were 0.21, 0.32, 0.27 mA, respectively. The device modified with 2T GD displays the highest photocurrent, which is significantly enhanced in comparison to the unmodified device (0.08 mA) under a 365-nm UV radiation of 100 mu W.cm(-2) . Meanwhile, the responsivity and detectivity are improved remarkably. Under a bias of 10 V, the 2T-GD-modified detector displays high responsivity of 1759 A.VV -1 and detectivity of 4.23x10(15) Jones. The detectivity is thus far the highest for ZnO UV detectors prepared by the sol-gel method. The improved performance of the GD-modified detector is attributed to the p-n junction formed between the GD and the ZnO film. At dark, the p-n junction is formed between the ZnO film and the GD, which greatly decreases the dark current of the detector. Under UV illumination, photogenerated holes accumulate in the GD, reducing electron-hole recombination; thus, the photocurrent is significantly increased. Furthermore, desorption and absorption of oxygen on the ZnO surface are much reduced due to the GD attached on the ZnO surface, thus improving the response speed of the detector. However, the intensive distribution of GD slightly hinders the UV absorption of ZnO thin films, reducing the responsivity of the detector. Careful optimization shows that the use of 2T GD gives the best output, and the corresponding ZnO UV detector exhibits very good performance. Overall, this study demonstrates that using GD can effectively improve the performance of ZnO UV detector.
语种	英语
出版者	PEKING UNIV PRESS
WOS记录号	WOS:000431609200011
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/43205]
专题	中国科学院化学研究所
通讯作者	Yu Zhinong; Wang Jizheng
作者单位	1.Beijing Inst Technol, Sch Optoelect, Beijing Engn Res Ctr Mixed Real & Adv Display, Beijing 100081, Peoples R China 2.Chinese Acad Sci, Inst Chem, Key Lab Organ Solids, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Huang Zhijuan,Yu Zhinong,Li Yan,et al. ZnO Ultraviolet Photodetector Modified with Graphdiyne[J]. ACTA PHYSICO-CHIMICA SINICA,2018,34(9):1088-1094.
APA	Huang Zhijuan,Yu Zhinong,Li Yan,&Wang Jizheng.(2018).ZnO Ultraviolet Photodetector Modified with Graphdiyne.ACTA PHYSICO-CHIMICA SINICA,34(9),1088-1094.
MLA	Huang Zhijuan,et al."ZnO Ultraviolet Photodetector Modified with Graphdiyne".ACTA PHYSICO-CHIMICA SINICA 34.9(2018):1088-1094.