Journal
NANO LETTERS
Volume 15, Issue 5, Pages 3088-3095Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00096
Keywords
Nanostructures; solar cells; quantum dots; charge transfer; three-dimensional
Categories
Funding
- National Key Project on Basic Research [2015CB932302, 2012CB932900, 2011CB808701]
- National Natural Science Foundation of China [91127044, 21173237]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12020100]
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The key challenges in enhancing the power conversion efficiency (PCE) of a quantum dot-sensitized solar cell (QDSSC) are efficiently achieving charge separation at the photoanode and improving the charge transfer, which is limited by the interface between the electrolyte and the counter electrode (CE). Here, hierarchically assembled ITO@Cu2S nanowire arrays with conductive single-crystalline ITO cores and Cu2S nanocrystal shells were designed as efficient QDSSCs CEs. These arrays not only provided an efficient three-dimensional charge transport network but also allowed for the effective deposition of more Cu2S nanocrystals as active sites to catalyze the electrolyte reaction. This design considerably reduced the sheet and charge transfer resistance of the CE, thus decreasing the series resistance and increasing the shunt resistance of the QDSSC. As a result, QDSSCs with this CE exhibited an unprecedentedly high V-oc of 0.688 V, a fill factor of 58.39%, and a PCE of 6.12%, which is 21.2% higher than that of the conventional brass/Cu2S CE.
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