ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces
5 years ago

Route to Improving Photovoltaics Based on CdSe/CdSexTe1–x Type-II Heterojunction Nanorods: The Effect of Morphology and Cosensitization on Carrier Recombination and Transport

Route to Improving Photovoltaics Based on CdSe/CdSexTe1–x Type-II Heterojunction Nanorods: The Effect of Morphology and Cosensitization on Carrier Recombination and Transport
Jaewook Kim, Byungwoo Park, Moonsub Shim, Sangheon Lee, Byungho Lee, Bumjin Gil, Joseph C. Flanagan, Taehyun Hwang
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.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b09745

DOI: 10.1021/acsami.7b09745

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