Boron and Sulfur Co-doped TiO2 Nanofilm as High Efficiency CdS Quantum-dot-sensitized Solar Cells

doi:10.15541/jim20150518

Abstract

Abstract:

B and S co-doped TiO₂ was prepared by a typical hydrothermal synthesis. Then the obtained B-S-TiO₂ was dissolved in organic solvent to form paste and then coated on FTO conducting glass by screen printing to prepare nanofilm. The CdS/B-S-TiO₂ composite electrodes was obtained by chemical bath deposition (CBD) using B-S-TiO₂ nanofilm and CdS quantum dots (QDs). The obtained samples were characterized by EDS, XRD, TEM and UV-Vis. The results show that B and S do not change the structure of anatase TiO₂. Noticeable shifts of absorbance edge towards longer wavelength were observed and the absorbance intensity of the B-S-TiO₂ nanofilm increases significantly. Furthermore, NiS was prepared as counter electrode by CBD and a modified polysulfide redox couple, ((CH₃)₄N)₂S/((CH₃)₄N)₂S_n, was employed as electrolyte to assemble CdS quantum-dots (QDs)-sensitized solar cells. The measurements show that the cells have an enhanced energy conversion efficiency under AM 1.5 G illuminations which increased from 3.21% to 3.69%, about 14.9% increment, with a significantly high open voltage (V_oc) of 1.218 V, a high filled factor (ff) of 88.7%, and a short-circuit photocurrent (J_sc) of 3.42 mA/cm².

Key words: CdS quantum dots sensitized solar cells, B/S co-doped TiO2, chemical bath deposition (CBD), NiS counter electrode, ((CH3)4N)2S/((CH3)4N)2Sn electrolyte

CLC Number:

O613

LI Ling, XIAO Jun-Ying, CUI Mi-Dou, TAI You-Yi, PANG Yong-Wen, HAN Song, LI Xiao-Wei. Boron and Sulfur Co-doped TiO₂ Nanofilm as High Efficiency CdS Quantum-dot-sensitized Solar Cells[J]. Journal of Inorganic Materials, 2016, 31(6): 627-633.

Figures/Tables 10

Scheme 1 Schematic presentation of the CdS QD sensitized B/S co-doped TiO2 solar cell structure

Table 1 Parameter of J-V curve in different amounts of CdS quantum deposition layer with pure TiO2

Sample	V_oc/V	J_sc/(mA·cm^-2)	ff	E_ff
TiO₂/TGA/CdS-1	1.102	1.46	75.1%	1.21%
TiO₂/TGA/CdS-2	1.204	2.25	77.7%	2.10%
TiO₂/TGA/CdS-3	1.217	2.96	89.1%	3.21%
TiO₂/TGA/CdS-4	1.207	1.33	68.2%	1.09%
TiO₂/TGA/CdS-5	1.122	2.09	42.3%	0.99%

Table 2 Parameter of J-V curve in different amount of CdS quantum deposition layer with B/S-TiO2

Sample	V_oc/V	J_sc/(mA·cm^-2)	ff	E_ff
B/S/TiO₂/TGA/CdS/1	1.211	1.17	67.8%	0.96%
B/S/TiO₂/TGA/CdS/2	1.225	2.55	83.8%	2.62 %
TiO₂/TGA/CdS-3	1.217	2.96	89.1%	3.21%
B/S/TiO₂/TGA/CdS/3	1.218	3.42	88.7%	3.69 %
B/S/TiO₂/TGA/CdS/4	1.112	1.25	80.9%	1.12%
B/S/TiO₂/TGA/CdS/5	1.211	1.48	48.2%	0.86%

Fig. 1 XRD patterns of pure TiO2 (a) and 0.5%B/S-doped TiO2 (b)

Fig. 2 XPS spectra of B/S/TiO2

Fig. 3 TEM image of CdS QD sensitized B/S co-doped TiO2 film

Fig. 4 UV-vis absorption spectra of (a) pure TiO2 film, (b) B/S doped TiO2/TGA/CdS-1 film, (c) B/S doped TiO2/TGA/ CdS-3 film, and (d) B/S doped TiO2/TGA/CdS-5 film

Fig. 5 J-V characteristics of the B-S-TiO2/TGA/CdS-3 cell and TiO2/TGA/CdS-3 cell

Fig. 6 Incident photon-to-current conversion efficiency (IPCE) of the cell based on TiO2/TGA/CdS-3 electrode and B-S-TiO2/ TGA/CdS-3 electrode

Fig. 7 Electrochemical impedance spectra for NiS and Pt counter electrodes with the same B-S-TiO2/TGA/CdS-3 film

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Boron and Sulfur Co-doped TiO₂ Nanofilm as High Efficiency CdS Quantum-dot-sensitized Solar Cells

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