Influence of Au Doping on the Surface States and Charge Transport in TiO2 Films†

doi:10.7503/cjcu20170021

Abstract

Abstract:

Nanoblocky TiO₂ with different contents of Au doping was synthesized by two-step method. Cyclic voltammetry and electrochemical impedance spectroscopy were used to investigate the influence of Au doping on the number and distribution of surface states in the films. Meanwhile, intensity-modulated photocurrent/photovoltage spectroscopy was used to study the electron transfer and recombination process. The results show that Au doping can effectively reduce the surface states in TiO₂ films and optimize the energy distribution. Furthermore, in-depth characterizations indicate that Au doping(molar fraction, 0.2%) can increase the charge transfer resistance at the interfaces of dyed-TiO₂/electrolyte. Overall, the cell performance was relatively dependent on the effect of surface states essentially.

Key words: Surface state, Au Doping, TiO2 Film, Charge transport, Solar cell

CLC Number:

O646

TrendMD:

ZHENG Jiawei, JIANG Ling, DING Yong, MO Lie, DING Youcai, HU Linhua, DAI Songyuan. Influence of Au Doping on the Surface States and Charge Transport in TiO₂ Films^†[J]. Chem. J. Chinese Universities, 2017, 38(11): 2038.

Figures/Tables 11

Fig.1 SEM images of TiO2-1(A, D), TiO2-2(B, E) and TiO2-3(C, F) films

Fig.2 XRD patterns of TiO2-1(a), TiO2-2(b) and TiO2-3(c) films

Fig.3 XPS spectra of TiO2-2(A) and TiO2-3(B) films

Fig.4 Peak current of TiO2-1 film under different scan rates(A) and cyclic voltammograms of TiO2-1(a), TiO2-2(b) and TiO2-3(c) films at the scan rate of 500 mV/s(B)

Fig.5 General transmission line model of DSSCsRs: Square resistance; Rco: interface resistance between TCO and TiO2; Cco: interface capacitance between TCO and TiO2; Rt: transmission resistance of electrons in TiO2; Cμ: interface capacitance between TiO2 and solution; Rct: interface resistance between TiO2 and solution; RTCO: interface resistance between TCO and solution; CTCO: interface capacitance between TCO and solution; Zd: impedance of solution; RPt: interface resistance between Pt and solution; CPt: interface capacitance between Pt and solution.

Fig.6 Results from the impedance data for chemical capacitance of DSSCs with TiO2-1(a), TiO2-2(b) and TiO2-3(c) photoanodes

Fig.7 Voc as a function of lnQ for three cells

Fig.8 Light intensity dependence of electron transport time(A) and electron lifetime(B) for three DSSCs

Fig.9 Nyquist plots of the three photoanode-based DSSCs at -0.72 V in dark conditionsRs is the series resistance, CPE1 and Rct1 are the double-layer capacitance and charge-transfer resistance between Pt counter electrode and electrolyte. CPE2 and Rct2 are the chemical capacitance and charge-transfer resistance between the mesoscopic TiO2 film and electrolyte. ZW is the diffusion impedance.

Fig.10 J-V(A) and IPCE-λ curves(B) of the DSSCs with the three photoanodes

Table 1 Photovoltaic characteristics of DSSCs with the three photoanodes

Cell	J_sc/(mA·cm^-2)	V_oc/mV	FF	η(%)
DSSC-1	13.90±0.18	688±8	0.73±0.01	6.99±0.12
DSSC-2	14.30±0.29	702±3	0.74±0.01	7.48±0.10
DSSC-3	14.07±0.12	695±3	0.74±0.01	7.22±0.08

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Influence of Au Doping on the Surface States and Charge Transport in TiO₂ Films^†

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