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Issue 34, 2008
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Nanoscale morphology and performance of molecular-weight-dependent poly(3-hexylthiophene)/TiO2nanorod hybrid solar cells

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Abstract

We have investigated the effect of polymer molecular weight on the morphology and performance of poly(3-hexylthiophene)/TiO2nanorod hybrid photovoltaic devices by using scanning near field optical microscopy (SNOM), atomic force microscopy (AFM) and confocal Raman microscopy. From the topography and absorption mapping images, it is found that the rod-like structure of the low molecular weight polymer hybrid film consists of a large amount of grain boundaries and has a less continuous absorption mapping image. In contrast, the larger domain structure of the high molecular weight polymer hybrid film exhibits a continuous absorption mapping image, as a result of enhanced polymer stacking and electronic delocalization. The nanoscale morphology of the hybrid samples with different molecular weights also reveals the nature of photovoltaic performance and carrier transport behavior investigated by the time-of-flight technique.

Graphical abstract: Nanoscale morphology and performance of molecular-weight-dependent poly(3-hexylthiophene)/TiO2nanorod hybrid solar cells

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Publication details

The article was received on 28 Feb 2008, accepted on 10 Jun 2008 and first published on 22 Jul 2008


Article type: Paper
DOI: 10.1039/B803484B
Citation: J. Mater. Chem., 2008,18, 4097-4102
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    Nanoscale morphology and performance of molecular-weight-dependent poly(3-hexylthiophene)/TiO2nanorod hybrid solar cells

    M. Wu, C. Chang, H. Lo, Y. Lin, Y. Lin, W. Yen, W. Su, Y. Chen and C. Chen, J. Mater. Chem., 2008, 18, 4097
    DOI: 10.1039/B803484B

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