Switched photocurrent direction in Au/TiO2 bilayer thin films
Chen, Hongjun1,2; Liu, Gang3; Wang, Lianzhou1,2
Corresponding AuthorWang, Lianzhou(
AbstractSwitched 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.
Funding OrganizationAustralian Research Council ; University of Queensland
Indexed BySCI
Funding ProjectAustralian Research Council ; University of Queensland
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000355606200001
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Document Type期刊论文
Corresponding AuthorWang, Lianzhou
Affiliation1.Univ Queensland, Nanomat Ctr, Sch Chem Engn, Brisbane, Qld 4072, Australia
2.Univ Queensland, Australian Inst Bioengn & Nanotechnol, Brisbane, Qld 4072, Australia
3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Chen, Hongjun,Liu, Gang,Wang, Lianzhou. Switched photocurrent direction in Au/TiO2 bilayer thin films[J]. SCIENTIFIC REPORTS,2015,5:9.
APA Chen, Hongjun,Liu, Gang,&Wang, Lianzhou.(2015).Switched photocurrent direction in Au/TiO2 bilayer thin films.SCIENTIFIC REPORTS,5,9.
MLA Chen, Hongjun,et al."Switched photocurrent direction in Au/TiO2 bilayer thin films".SCIENTIFIC REPORTS 5(2015):9.
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