Transparent Cu1.8S and CuS thin films on FTO as efficient counter electrode for quantum dot solar cells

Title
Transparent Cu1.8S and CuS thin films on FTO as efficient counter electrode for quantum dot solar cells
Authors
Shankara S. Kalanur채상윤주오심
Keywords
Quantum dot solar cell; Counter electrode; Copper sulfide; Hydrothermal method; Polysulfide redox couple; Charge-transfer resistancea
Issue Date
2013-07
Publisher
Electrochimica acta
Citation
VOL 103, 91-95
Abstract
The use of metal sulfides as counter electrode (CE) improves the short circuit current, open circuit volt-age, fill factor, and power conversion efficiency (η) of quantum dot solar cells (QDSCs) compared tothe conventional Pt electrode. Here we demonstrate a simple hydrothermal method for the preparationof copper sulfide thin film on FTO, containing Cu1.8S and CuS (Cu1.8S/CuS) which can serve as efficientCE for QDSCs. Hydrothermal deposition of Cu1.8S/CuS is carried out using thiourea as a source of sul-fur and different copper salts as a source for copper. The product stoichiometry between Cu and S isobserved to be dependent on the copper precursor. Under the illumination of one sun (100 mW cm−2),the CdS–TiO2QDSCs incorporated with Cu1.8S/CuS CE exhibits η values of 1.66%, which is much higherthan the value 0.61% obtained with Pt CE. Electrochemical impedance spectroscopy reveals low chargetransfer resistance between polysulfide electrolyte and Cu1.8S/CuS CE, indicating the high catalytic activ-ity of Cu1.8S/CuS CE. The results of this work show the potential application of hydrothermal syntheticmethod in making Cu1.8S/CuS CE instead of Pt, for large-scale transparent QDSCs in the future.
URI
http://pubs.kist.re.kr/handle/201004/44872
ISSN
00134686
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KIST Publication > Article
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