Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 3, Pages 1796-1802Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am3000616
Keywords
Cu2ZnSnSe4; nanoparticles; solvothermal; counter electrode; dye-sensitized solar cells
Funding
- National Natural Science Foundation of China [20871041, 20903033]
- New Century Excellent Talents in University [NCET-08-0659]
- Scientific Research Foundation of Henan University [SBGJ090510, 2010YBZR014]
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Cu2ZnSnSe4 (CZTSe) nanoparticles with diameters of 200-300 nm were synthesized by one-step solvothermal method without surfactants or templates. The structure, composition and morphology of CZTSe nanoparticles were characterized by XRD, XPS, Raman spectrum, EDS, FESEM and TEM. The results indicated that the nanoparticles were single phase and nearly stoichiometric composition. CZTSe nanoparticles drop-casted onto FTO substrate were used as counter electrode (CE) in dye-sensitized solar cells (DSSCs) for the first time, which exhibited Pt-like electrocatalytic activity for the reduction of I-3(-) to I- in DSSCs. The J-V results demonstrated that the thickness of the film affected the photocurrent density and fill factor remarkably, which resulted from the difference of electrocatalytic sites and resistance with different thickness films. And a best efficiency of 3.85% was obtained by adjusting the film thickness. The work presents a new approach for developing low-cost, facile fabrication CZTSe nanoparticles, and demonstrates CZTSe can be explored as a low-cost alternative for expensive and scare Pt in DSSCs.
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