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Wurtzite copper-zinc-tin sulfide as a superior counter electrode material for dye-sensitized solar cells.

Kong J, Zhou ZJ, Li M, Zhou WH, Yuan SJ, Yao RY, Zhao Y, Wu SX - Nanoscale Res Lett (2013)

Bottom Line: Wurtzite and kesterite Cu2ZnSnS4 (CZTS) nanocrystals were employed as counter electrode (CE) materials for dye-sensitized solar cells (DSSCs).Compared to kesterite CZTS, the wurtzite CZTS exhibited higher electrocatalytic activity for catalyzing reduction of iodide electrolyte and better conductivity.Accordingly, the DSSC with wurtzite CZTS CE generated higher power conversion efficiency (6.89%) than that of Pt (6.23%) and kesterite CZTS (4.89%) CEs.

View Article: PubMed Central - HTML - PubMed

Affiliation: The Key Laboratory for Special Functional Material of MOE, Henan University, Kaifeng 475004, China. zzj@henu.edu.cn.

ABSTRACT
Wurtzite and kesterite Cu2ZnSnS4 (CZTS) nanocrystals were employed as counter electrode (CE) materials for dye-sensitized solar cells (DSSCs). Compared to kesterite CZTS, the wurtzite CZTS exhibited higher electrocatalytic activity for catalyzing reduction of iodide electrolyte and better conductivity. Accordingly, the DSSC with wurtzite CZTS CE generated higher power conversion efficiency (6.89%) than that of Pt (6.23%) and kesterite CZTS (4.89%) CEs.

No MeSH data available.


Related in: MedlinePlus

Current density-voltage (J-V) curves of DSSCs based on different CEs under AM 1.5 (100 mW cm-2).
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Figure 5: Current density-voltage (J-V) curves of DSSCs based on different CEs under AM 1.5 (100 mW cm-2).

Mentions: The performance of CE materials in DSSC devices depends not only on its catalytic activity, but also on the electrical conductivity [29,30]. Electrochemical impedance spectroscopy (EIS) is an effective and widely used tool for investigating the charge transfer process and thereby for evaluating the catalytic activity of a catalyst [31]. Figure 4 shows the Nyquist plots for the devices with wurtzite and kesterite CZTS CEs. The high-frequency intercept on the real axis corresponds to the series resistance (Rs). The first semicircle at the high-frequency region arises from the charge transfer property (Rct). The values of Rs and Rct obtained by fitting the spectra in Figure 5 with an EIS spectrum analyzer are summarized in Table 1. The largest Rs (17.02 Ω) of kesterite CZTS CE can be attributed to the strong ligand of oleylamine on the CZTS NC surface. Similarly, some organic substance capped on the surface of the wurtzite CZTS NCs made the Rs (16.2 Ω) of wurtzite CZTS CE higher than that (15.91 Ω) of Pt CE. However, the value of Rct (2.78 Ω) of the wurtzite CZTS CE is lower than that of Pt (2.92 Ω) and kesterite CZTS (3.56 Ω). The smallest Rct for wurtzite CZTS CE implies that it has eximious catalytic activity on the reduction of triiodide and supersedes the expensive Pt as the CE in DSSCs. The conclusions for the catalytic activity derived from the EIS and CV data are consistent.


Wurtzite copper-zinc-tin sulfide as a superior counter electrode material for dye-sensitized solar cells.

Kong J, Zhou ZJ, Li M, Zhou WH, Yuan SJ, Yao RY, Zhao Y, Wu SX - Nanoscale Res Lett (2013)

Current density-voltage (J-V) curves of DSSCs based on different CEs under AM 1.5 (100 mW cm-2).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4228334&req=5

Figure 5: Current density-voltage (J-V) curves of DSSCs based on different CEs under AM 1.5 (100 mW cm-2).
Mentions: The performance of CE materials in DSSC devices depends not only on its catalytic activity, but also on the electrical conductivity [29,30]. Electrochemical impedance spectroscopy (EIS) is an effective and widely used tool for investigating the charge transfer process and thereby for evaluating the catalytic activity of a catalyst [31]. Figure 4 shows the Nyquist plots for the devices with wurtzite and kesterite CZTS CEs. The high-frequency intercept on the real axis corresponds to the series resistance (Rs). The first semicircle at the high-frequency region arises from the charge transfer property (Rct). The values of Rs and Rct obtained by fitting the spectra in Figure 5 with an EIS spectrum analyzer are summarized in Table 1. The largest Rs (17.02 Ω) of kesterite CZTS CE can be attributed to the strong ligand of oleylamine on the CZTS NC surface. Similarly, some organic substance capped on the surface of the wurtzite CZTS NCs made the Rs (16.2 Ω) of wurtzite CZTS CE higher than that (15.91 Ω) of Pt CE. However, the value of Rct (2.78 Ω) of the wurtzite CZTS CE is lower than that of Pt (2.92 Ω) and kesterite CZTS (3.56 Ω). The smallest Rct for wurtzite CZTS CE implies that it has eximious catalytic activity on the reduction of triiodide and supersedes the expensive Pt as the CE in DSSCs. The conclusions for the catalytic activity derived from the EIS and CV data are consistent.

Bottom Line: Wurtzite and kesterite Cu2ZnSnS4 (CZTS) nanocrystals were employed as counter electrode (CE) materials for dye-sensitized solar cells (DSSCs).Compared to kesterite CZTS, the wurtzite CZTS exhibited higher electrocatalytic activity for catalyzing reduction of iodide electrolyte and better conductivity.Accordingly, the DSSC with wurtzite CZTS CE generated higher power conversion efficiency (6.89%) than that of Pt (6.23%) and kesterite CZTS (4.89%) CEs.

View Article: PubMed Central - HTML - PubMed

Affiliation: The Key Laboratory for Special Functional Material of MOE, Henan University, Kaifeng 475004, China. zzj@henu.edu.cn.

ABSTRACT
Wurtzite and kesterite Cu2ZnSnS4 (CZTS) nanocrystals were employed as counter electrode (CE) materials for dye-sensitized solar cells (DSSCs). Compared to kesterite CZTS, the wurtzite CZTS exhibited higher electrocatalytic activity for catalyzing reduction of iodide electrolyte and better conductivity. Accordingly, the DSSC with wurtzite CZTS CE generated higher power conversion efficiency (6.89%) than that of Pt (6.23%) and kesterite CZTS (4.89%) CEs.

No MeSH data available.


Related in: MedlinePlus