Enhanced electron injection/transportation by surface states increment in mesoporous TiO<sub>2</sub> dye-sensitized solar cells

doi:10.1007/s12200-011-0204-3

Front Optoelec Chin

2011, Vol. 4

Issue (1) : 65-71 https://doi.org/10.1007/s12200-011-0204-3

RESEARCH ARTICLE

Enhanced electron injection/transportation by surface states increment in mesoporous TiO₂ dye-sensitized solar cells

Minghui DENG¹, Shuqing HUANG¹, Zhexun YU¹, Dongmei LI¹, Yanhong LUO¹, Yubai BAI², Qingbo MENG¹(

)

1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2. College of Chemistry, Jilin University, Changchun 130023, China

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Abstract

A strategy of surface modification to the mesoporous TiO₂ photoanode with hydrochloric acid treatment was used in this study, and it was found that short circuit current and photovoltaic efficiency of dye-sensitized solar cells (DSSCs) were increased by 5.5% and 8.9% respectively. The improvement was attributed to the reduced impedances in the TiO₂ film and at the TiO₂/dye/electrolyte interface. It was showed that the increased surface electronic states could remarkably prolong electron lifetime, which was responsible for the reduction of impedances. Under these quasi-continuous states in mesoporous structure, the electron injection/transportation can be notably facilitated, which will be beneficial for the DSSC performance.

Keywords dye-sensitized solar cell (DSSC) surface states surface modification electron transportation

Corresponding Author(s): MENG Qingbo,Email:qbmeng@aphy.iphy.ac.cn

Issue Date: 05 March 2011

Cite this article:

Minghui DENG,Shuqing HUANG,Zhexun YU, et al. Enhanced electron injection/transportation by surface states increment in mesoporous TiO₂ dye-sensitized solar cells[J]. Front Optoelec Chin, 2011, 4(1): 65-71.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-011-0204-3
https://academic.hep.com.cn/foe/EN/Y2011/V4/I1/65

Fig.1 Cell performance for normal (dash line) and modified (solid line) DSSCs under various illumination intensities

Fig.2 Absorption spectra of desorbed sensitizer solution of normal (dash line) and surface modified (solid line) TiO photoanodes

Fig.3 Normalized O (1 s) XPS spectra of freshly made normal (dash line) and modified (solid line) TiO photoanodes

Fig.4 (a) Nyquist diagram of experiment (scatter) and the fitting curve (line) of impedance spectra obtained for normal (hollow) and acid pretreated (solid) DSSCs under different light intensities (?: 100%; ?: 75%; ○: 50%; ?: 25%); (b) equivalent circuit for EIS spectra simulation

Tab.1 Fitting values of measured electrochemical impedance spectra with equivalent circuit in Fig. 4(b).

Fig.5 TiO/dye/electrolyte interface property dependence on with logarithm coordinates in vertical. (a) Resistance; (b) capacitance

Fig.6 Dark current with applied potential for normal (solid line) and HCl treated (dash line) DSSCs with different HCl concentrations

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