Comparative advantages of Zn-Cu-In-S alloy QDs in the construction of quantum dot-sensitized solar cells

Alloyed structures of quantum dot light-harvesting materials favor the suppression of unwanted charge recombination as well as acceleration of the charge extraction and therefore the improvement of photovoltaic performance of the resulting solar cell devices. Herein, the advantages of Zn-Cu-In-S (ZC...

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Bibliographic Details
Published in:RSC advances 2018-01, Vol.8 (7), p.3637-3645
Main Authors: Yue, Liang, Rao, Huashang, Du, Jun, Pan, Zhenxiao, Yu, Juan, Zhong, Xinhua
Format: Article
Language:English
Subjects:
Chemistry
Circuits
Construction materials
Copper base alloys
Electrochemical impedance spectroscopy
Energy conversion efficiency
Open circuit voltage
Photovoltaic cells
Quantum dots
Solar cells
Substrates
Titanium oxides
Zinc base alloys
Zinc sulfide
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Summary:Alloyed structures of quantum dot light-harvesting materials favor the suppression of unwanted charge recombination as well as acceleration of the charge extraction and therefore the improvement of photovoltaic performance of the resulting solar cell devices. Herein, the advantages of Zn-Cu-In-S (ZCIS) alloy QD serving as light-harvesting sensitizer materials in the construction of quantum dot-sensitized solar cells (QDSCs) were compared with core/shell structured CIS/ZnS, as well as pristine CIS QDs. The built QDSCs with alloyed Zn-Cu-In-S QDs as photosensitizer achieved an average power conversion efficiency (PCE) of 8.47% ( V oc = 0.613 V, J sc = 22.62 mA cm −2 , FF = 0.610) under AM 1.5G one sun irradiation, which was enhanced by 21%, and 82% in comparison to those of CIS/ZnS, and CIS based solar cells, respectively. In comparison to cell device assembled by the plain CIS and core/shell structured CIS/ZnS, the enhanced photovoltaic performance in ZCIS QDSCs is mainly ascribed to the faster photon generated electron injection rate from QD into TiO 2 substrate, and the effective restraint of charge recombination, as confirmed by incident photon-to-current conversion efficiency (IPCE), open-circuit voltage decay (OCVD), as well as electrochemical impedance spectroscopy (EIS) measurements. Benefiting from the accelerative electron injection and retarded charge recombination, Zn-Cu-In-S alloy QD based QDSC achieved a PCE of 8.55%, which is 21%, and 82% higher than those of CIS/ZnS, and pristine CIS QDs based solar cells, respectively.
ISSN:2046-2069
2046-2069
DOI:10.1039/c7ra12321c