Journal
CHEMPHYSCHEM
Volume 14, Issue 2, Pages 364-368Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201200876
Keywords
Ag2S; nanowires; quantum dots; solar cells; ZnO
Funding
- National Research Foundation [NRF2010-0009545]
- Korean Research Foundation
- Korean Government (MOEHRD) [KRF-2008-005-J00501]
- Hyundai-Kia Motors
- National Research Foundation of Korea [2010-0009545, 2009-0094036] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this work, we develop a low-temperature, facile solution reaction route for the fabrication of quantum-dot-sensitized solar cells (QDSSCs) containing Ag2S-ZnO nanowires (NWs), simultaneously ensuring low manufacturing costs and environmental safety. For comparison, a CdS-ZnO NW photoanode was also prepared using the layer-by-layer growth method. Ultraviolet photoelectron spectroscopy analysis revealed type-II band alignments for the band structures of both photoanodes which facilitate electron transfer/collection. Compared to CdS-ZnO QDSSCs, Ag2S-ZnO QDSSCs exhibit a considerably higher short-circuit current density (Jsc) and a strongly enhanced light-harvesting efficiency, but lower open-circuit voltages (Voc), resulting in almost the same power-conversion efficiency of 1.2%. Through this work, we demonstrate Ag2S as an efficient quantum-dot-sensitizing material that has the potential to replace Cd-based sensitizers for eco-friendly applications.
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