Hostname: page-component-848d4c4894-x5gtn Total loading time: 0 Render date: 2024-04-30T13:39:54.937Z Has data issue: false hasContentIssue false
  • English
  • Français

Nb-doped TiO2 Thin Films Prepared through TiCl4 Treatment for Improvement of Their Carrier Transport Property

Published online by Cambridge University Press:  18 November 2019

Takaki Kimura ,
Kan Hachiya  and
Takashi Sagawa
Takaki Kimura*
Affiliation:
Graduate School of Energy Science, Kyoto University, Yoshida Honmachi, Sakyo-ku, Kyoto 606-8501, JAPAN
Kan Hachiya
Affiliation:
Graduate School of Energy Science, Kyoto University, Yoshida Honmachi, Sakyo-ku, Kyoto 606-8501, JAPAN
Takashi Sagawa
Affiliation:
Graduate School of Energy Science, Kyoto University, Yoshida Honmachi, Sakyo-ku, Kyoto 606-8501, JAPAN
*
*(Email: kimura.takaki.58z@st.kyoto-u.ac.jp)
Get access

Abstract

Nb-doped TiO2 thin-films were prepared on fluorine-doped tin oxide (FTO) coated glass directly with niobium ethoxide and TiCl4 in water under the acidic conditions with several concentrations of HCl at 70-90 °C for 45 minutes or 1 hour followed by rinsing with water and annealing at 100 °C for 1 hour. Thin films of 0-1% Nb-doped TiO2 with rutile phase on FTO were obtained, which were confirmed through X-ray diffraction analyses and measurements of energy dispersive X-ray spectroscopy (EDS). Scanning electron microscopy observations equipped with EDS revealed that higher growth temperature over 90 °C is required for doping of Nb. While higher concentration of HCl resulted in much amount of Nb-doping. Band gap of rutile TiO2 gradually reduced from 3.3 eV to 3.23 eV through Nb-doping from 0% to 1%, which were estimated from uv-vis absorption spectroscopic analyses. Hall effect measurements by taking van der Pauw method confirmed that 2.26 times increase of the carrier density and 1.78 times enhancement of the conductivity have been achieved in the case of 1% Nb-doping.

Keywords

dopantelectrical propertiesoptical propertiessemiconductingthin film
Type
Articles
Information
MRS Advances , Volume 4 , Issue 49: Energy and Sustainability , 2019 , pp. 2665 - 2671
Copyright
Copyright © Materials Research Society 2019 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

RERERENCES

Cheng, P., Du, S., Cai, Y., Liu, F., Sun, P., Zheng, J., and Lu, G., J. Phys. Chem. C 117, 24150−24156 (2013).CrossRefGoogle Scholar
Liu, C., Zhu, R., Ng, A., Ren, Z., Cheung, S. H., Du, L., So, S. K., Zapien, J. A., Djurisic, A. B., Phillips, D. L., and Surya, C., J. Mater. Chem. A 5, 15970–15980 (2017).CrossRefGoogle Scholar
Mallak, M., Bockmeyer, M., and Löbmann, P., Thin Solid Films 515, 8072–8077 (2007).CrossRefGoogle Scholar
Manole, A.V., Dobromir, M., Gîrtan, M., Mallet, R., Rusu, G., and Luca, D., Ceramics International 39, 4771–4776 (2013).CrossRefGoogle Scholar
Liang, C., Wu, Z., Li, P., Fan, J., Zhang, Y., and Shao, G., Applied Surface Science 391, 337–344 (2017).CrossRefGoogle Scholar
Xu, Y., Gao, C., Tang, S., Zhang, J., Chen, Y., Zhu, Y., and Hu, Z., J. Alloys and Compounds 787, 1082-1088 (2019).CrossRefGoogle Scholar
Sommeling, P. M., O’Regan, B. C., Haswell, R. R., Smit, H. J. P., Bakker, N. J., Smits, J. J. T., Kroon, J. M., and van Roosmalen, J. A. M., J. Phys. Chem. B 110, 19191–19197 (2006).CrossRefGoogle Scholar
Liu, B. and Aydil, E. S., J. Am. Chem. Soc. 131, 3985–3990 (2009)CrossRefGoogle Scholar
Ko, Y., Kim, Y., Kong, S. Y., Kunnana, S. C., and Jun, Y., Solar Energy Materials and Solar Cells 183, 157-163 (2018).CrossRefGoogle Scholar
Thakur, U. K., Kisslinger, R., and Shankar, K., Nanomaterials 7, 95 (2017).CrossRefGoogle Scholar
Shannon, R., Acta Crystallogr. Sect. A 32, 751 (1976).CrossRefGoogle Scholar
Song, J., Li, S. P., Zhao, Y. L., Yuan, J., Zhu, Y., Fang, Y., Zhu, L., Gu, X. Q., and Qiang, Y. H., J. Alloys and Compounds 694, 1232-1238 (2017).CrossRefGoogle Scholar
Pang, Y. and Wynblatt, P., J. Am. Ceram. Soc. 89, 666–671 (2006).CrossRefGoogle Scholar
Li, Y., Guo, Y., Li, Y., and Zhou, X., Electrochimica Acta 200, 29–36 (2016).CrossRefGoogle Scholar