Effects of Annealing Atmosphere on Composition, Structure and Photovoltaic Properties of Solution-processed Sb2S3 Thin Films†

doi:10.7503/cjcu20180482

Abstract

Abstract:

Chemical bath deposition(CBD) method was used to deposit Sb₂S₃ on condensed TiO₂ film to prepare TiO₂/Sb₂S₃ planar heterojunction, and the FTO/TiO₂/Sb₂S₃/PCPDTBT/MoO₃/Au planar devices were fabricated with poly[2,6-{4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b']-dithiophene}-alt-4,7-(2,1,3-benzothiadiazole)](PCPDTBT) hole transporting layer and MoO₃ interfacial layer to modify Au electrode. The effects of annealing atmospheres on the composition, structure and photovoltaic properties of solution-processed Sb₂S₃ thin films were investigated. The results show that the cell efficiency only reaches 0.90% when the TiO₂/Sb₂S₃ film is annealed in N₂ atmosphere due to the presence of Sb₂O₃ secondary phase and a poor compactness in the resulting Sb₂S₃ thin film, while the smooth, well condensed and pure Sb₂S₃ thin film is obtained when annealing the TiO₂/Sb₂S₃ film in N₂-S atmosphere, leading to the elimination of Sb₂O₃ secondary phase and a significant increase in efficiency by 1.34 folds to 2.04%. It is found that the removal of Sb₂O₃ impurity reduces the charge recombination and facilitates the transport and collection efficiency of both electron and holes in bulk Sb₂S₃ layer, leading to improved device performance.

Key words: Sb₂S₃, Chemical bath deposition, Annealing atmosphere, Solar cell

CLC Number:

O646
O614

TrendMD:

QI Juanjuan,DONG Chao,Getinet Y. Ashebir,CHEN Junwei,WAN Zhiyang,CHEN Wangwei,ZHAO Qiuyuan,WANG Mingtai. Effects of Annealing Atmosphere on Composition, Structure and Photovoltaic Properties of Solution-processed Sb₂S₃ Thin Films^†[J]. Chem. J. Chinese Universities, 2019, 40(2): 342.

Figures/Tables 7

Fig.1 Architecture of solar cell

Fig.2 XRD patterns of TiO2(a), TiO2/Sb2S3(Am)(b), TiO2/Sb2S3(N2-S)(c) and TiO2/Sb2S3(N2)(d) filmsFor pattern a, ▲ indicates the XRD peak of anatase TiO2, other peaks are of FTO substrate.

Fig.3 XPS spectra of Sb3d of TiO2/Sb2S3(Am)(a), TiO2/Sb2S3(N2-S)(b) and TiO2/Sb2S3(N2)(c)

Fig.4 UV-Vis absorption spectra of TiO2/Sb2S3(Am)(a),TiO2/Sb2S3(N2)(b) and TiO2/Sb2S3(N2-S)(c)The inset shows the absorption spectrum of PCPDTBT film.

Fig.5 Sectional SEM images of TiO2/Sb2S3(Am)(A),TiO2/Sb2S3(N2)(B) and TiO2/Sb2S3(N2-S)(C)

Fig.6 J-V curves(A), IPCE spectra(B), band level alignments(C) and IMPS spectra(D) of the solar cells based on TiO2/Sb2S3(N2) and TiO2/Sb2S3(N2-S) heterojunctionsThe dotted line in (D) shows the tendency of IMPS response to reach III quadrant when the frequency is above 100 kHz that is beyond the frequency limit of our CIMPS system.

Table 1 Device performance under AM1.5 illumination*

Annealing atmosphere	V_oc/V	J_sc/(mA·cm^-2)	FF(%)	η(%)	R_s/kΩ	R_sh/kΩ	τ_D/μs
N₂	0.45±0.03	6.20±0.39	32.54±0.19	0.90±0.08	1.08±0.12	3.04±0.28	12.00±0.00
N₂-S	0.45±0.03	12.59±0.47	36.36±1.27	2.04±0.09	0.44±0.05	2.15±0.16	7.00±1.00

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Effects of Annealing Atmosphere on Composition, Structure and Photovoltaic Properties of Solution-processed Sb₂S₃ Thin Films^†

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