Dependence of nanocrystal dimensionality on the polymer nanomorphology, anisotropic optical absorption, and carrier transport in P3HT: TiO2 bulk heterojunctions

Chih Cheng Lin, Po Hsun Ho, Chi Liang Huang, Chao Hung Du, Chen Chieh Yu, Hsuen Li Chen, Yun Chieh Yeh, Shao Sian Li, Cheng Kuang Lee, Chun Wei Pao, Ching Pin Chang, Ming Wen Chu, Chun Wei Chen

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

It is known that the nanoscale morphological organization of donors or acceptors in bulk heterojunction (BHJ) solar cells is critical to device performance and strongly affects carrier generation, transporting, and collection. This work demonstrates the dependence of nanocrystal dimensionality and organization on the polymer nanomorphology in P3HT:TiO2 hybrid bulk heterojunctions, which were revealed using grazing-incidence X-ray diffraction (GIXRD) using a synchrotron X-ray beam and electron tomography. We further performed a multiscale molecular dynamic simulation to understand the morphological orientation of a polymer blended with TiO2 nanoparticles (NPs) or nanorods (NRs). The correlation between polymer nanoscale morphology and the dimensionality and anisotropy of nanocrystals in P3HT:TiO2 hybrids clearly explains the observation of different optical absorption and carrier transport behaviors in directions perpendicular or parallel to the film substrate. Our results provide crucial information toward understanding the interplay between nanocrystal dimensionality and polymer morphology in developing organic/inorganic hybrid electronic devices such as thin film transistors (TFTs) or photovoltaics (PVs).

Original languageEnglish
Pages (from-to)25081-25088
Number of pages8
JournalJournal of Physical Chemistry C
Volume116
Issue number47
DOIs
Publication statusPublished - Nov 29 2012
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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  • Cite this

    Lin, C. C., Ho, P. H., Huang, C. L., Du, C. H., Yu, C. C., Chen, H. L., Yeh, Y. C., Li, S. S., Lee, C. K., Pao, C. W., Chang, C. P., Chu, M. W., & Chen, C. W. (2012). Dependence of nanocrystal dimensionality on the polymer nanomorphology, anisotropic optical absorption, and carrier transport in P3HT: TiO2 bulk heterojunctions. Journal of Physical Chemistry C, 116(47), 25081-25088. https://doi.org/10.1021/jp306921e