Issue 34, 2008

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

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

Article information

Article type
Paper
Submitted
28 Feb 2008
Accepted
10 Jun 2008
First published
22 Jul 2008

J. Mater. Chem., 2008,18, 4097-4102

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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