Jump to main content
Jump to site search

Issue 17, 2010
Previous Article Next Article

The development of nanoscale morphology in polymer:fullerene photovoltaic blends during solvent casting

Author affiliations

Abstract

The power conversion efficiency in a conjugated polymer-functionalized fullerene bulk heterojunction organic photovoltaic (OPV) device is dependent both on the electronic properties of the constituent materials and on the nanoscale morphology of the active semiconductor layer thin-film. Here we use in situ ellipsometry and grazing incidence X-ray scattering (GI-XS) to study molecular self-organization in poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) blend films in real time, during the drying process as they are cast from solution. We illustrate the evolution of the extinction coefficient from a solution to a solid, semi-crystalline state. We show that once the solvent fraction in the film falls below 50%, the P3HT undergoes rapid crystallization via heterogeneous nucleation; a process that is complete in seconds. We also evidence a rapid, dynamic self-annealing process that reduces the characteristic lamella spacing in the P3HT crystallites. The mechanistic understanding of film-formation demonstrated here is an important component in optimizing deposition processes suitable for large-area OPV manufacture.

Graphical abstract: The development of nanoscale morphology in polymer:fullerene photovoltaic blends during solvent casting

Back to tab navigation

Supplementary files

Article information


Submitted
07 May 2010
Accepted
08 Jun 2010
First published
07 Jul 2010

Soft Matter, 2010,6, 4128-4134
Article type
Paper

The development of nanoscale morphology in polymer:fullerene photovoltaic blends during solvent casting

T. Wang, A. D. F. Dunbar, P. A. Staniec, A. J. Pearson, P. E. Hopkinson, J. E. MacDonald, S. Lilliu, C. Pizzey, N. J. Terrill, A. M. Donald, A. J. Ryan, R. A. L. Jones and D. G. Lidzey, Soft Matter, 2010, 6, 4128
DOI: 10.1039/C0SM00343C

Social activity

Search articles by author

Spotlight

Advertisements