journal article·2016-01-01Open access

Band alignment of TiO2/FTO interface determined by X-ray photoelectron spectroscopy: Effect of annealing

Haibo Fan, Zhou Yang, Xianpei Ren, Mingli Yin, Fei Gao, Shengzhong (Frank) Liu

AIP Advances· Volume 6· Issue 1

Abstract

The energy band alignment between pulsed-laser-deposited TiO2 and FTO was firstly characterized using high-resolution X-ray photoelectron spectroscopy. A valence band offset (VBO) of 0.61 eV and a conduction band offset (CBO) of 0.29 eV were obtained across the TiO2/FTO heterointerface. With annealing process, the VBO and CBO across the heterointerface were found to be -0.16 eV and 1.06 eV, respectively, with the alignment transforming from type-I to type-II. The difference in the band alignment is believed to be dominated by the core level down-shift of the FTO substrate, which is a result of the oxidation of Sn. Current-voltage test has verified that the band alignment has a significant effect on the current transport of the heterojunction.
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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · ZnO doping and properties · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shaanxi Normal University 1 Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education; Shaanxi Engineering Lab for Advanced Energy Technology; School of Materials Science and Engineering, , Xi’an 710119, China

Northwest University 2 School of Physics, , Xi’an 710069, China

Xi’an Technological University 3 School of Science, , Xi’an, Shaanxi 710062, China

Chinese Academy of Sciences 4 Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, , Dalian, 116023, China

Funding

Changjiang Scholar and Innovative Research Team · Chinese National 1000-talent-plan Program · National university Research Fund · Overseas Talent Recruitment Project · National Natural Science Foundation of China · Natural Science Foundation of Shaanxi Province

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