期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 37, 页码 31931-31939出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b09745
关键词
sensitized solar cells; nanorods; type-II heterojunction; charge collection; II-VI semiconductors
资金
- National Research Foundation of Korea (NRF) [2015K2A1A2070386, 2016R1A2B4012938]
- U.S. NSF [1507170]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1507170] Funding Source: National Science Foundation
One-dimensionally elongated nanoparticles with type-II staggered band offset are of potential use as light-harvesting materials for photovoltaics, but only a limited attention has been given to elucidate the factors governing the cell performance obtainable from such materials. Herein, we describe a combined strategy to enhance charge collection from CdSe/CdSexTe1-x type-II heterojunction nanorods (HNRs) utilized as light harvesters for sensitized solar cells. By integrating morphology- and composition-tuned type-II HNRs into solar cells, factors that yield interfaces favorable both for the electron injection into TiO2 and hole transfer to electrolyte are examined. Furthermore, it is shown that a more efficient photovoltaic system results from cosensitization with CdS quantum dots (QDs) predeposited on a TiO2 scaffold, which improves charge collection from HNRs. Electrochemical impedance spectroscopy (EIS) analysis suggests that such a synergistically enhanced system benefits from the decreased recombination within HNRs and facilitated charge transport through the cosensitized TiO2 electrode, even with the activation of a recombination path presumably related to the photogenerated holes in CdS QDs.
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