Switched photocurrent direction in Au/TiO2 bilayer thin films

IMR OpenIR

	Switched photocurrent direction in Au/TiO2 bilayer thin films
	Chen, Hongjun; Liu, Gang; Wang, Lianzhou; gangliu@imr.ac.cn; l.wang@uq.edu.au
	2015
发表期刊	SCIENTIFIC REPORTS
ISSN	2045-2322
卷号	5 页码:-
摘要	Switched photocurrent direction in photoelectrodes is a very interesting phenomenon and has demonstrated their potentials in important applications including photodiodes, phototransistors, light-driven sensors and biosensors. However, the design and mechanism understanding of such photoelectrodes remain challenging to date. Here we report a new phenomenon of sequence-driven the photocurrent direction on a simple bilayer structure of 5 nm thick Au and 10 nm TiO2 under visible-light irradiation. It is found that when Au layer are deposited as the outer layer on TiO2 coated fluorine doped tin oxide (FTO) substrate (designated as FTO/TiO2/Au), anodic photocurrent is obtained due to the band bending formed at the electrode-electrolyte interface. Interestingly, simply swapping the deposition sequence of Au and TiO2 leads to cathodic photocurrent on FTO/Au/TiO2 electrode. Characterization and calculations on the photoelectrode reveals that the photogenerated electrons can be easily trapped in the energy well formed between the band bending and the Schottky contact, which allows electronic tunnelling through the 1.6 nm thick space charge layer, resulting in a unique anodic to cathodic photocurrent conversion. The understanding of this new phenomenon can be important for designing new generation optoelectronic converting devices in a low-cost and facile manner.
部门归属	[chen, hongjun ; wang, lianzhou] univ queensland, nanomat ctr, sch chem engn, brisbane, qld 4072, australia ; [chen, hongjun ; wang, lianzhou] univ queensland, australian inst bioengn & nanotechnol, brisbane, qld 4072, australia ; [liu, gang] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
资助者	Australian Research Council; University of Queensland
收录类别	sci
语种	英语
WOS记录号	WOS:000355606200001
引用统计	被引频次：71[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/75159
专题	中国科学院金属研究所
通讯作者	gangliu@imr.ac.cn; l.wang@uq.edu.au
推荐引用方式 GB/T 7714	Chen, Hongjun,Liu, Gang,Wang, Lianzhou,et al. Switched photocurrent direction in Au/TiO2 bilayer thin films[J]. SCIENTIFIC REPORTS,2015,5:-.
APA	Chen, Hongjun,Liu, Gang,Wang, Lianzhou,gangliu@imr.ac.cn,&l.wang@uq.edu.au.(2015).Switched photocurrent direction in Au/TiO2 bilayer thin films.SCIENTIFIC REPORTS,5,-.
MLA	Chen, Hongjun,et al."Switched photocurrent direction in Au/TiO2 bilayer thin films".SCIENTIFIC REPORTS 5(2015):-.