Jump to main content
Jump to site search

Issue 12, 2011
Previous Article Next Article

Charge transfer excitons in low band gap polymer based solar cells and the role of processing additives

Author affiliations

Abstract

Organic semiconductor blends yielding efficient charge generation and transport are key components for the development of high performance organic bulk-heterojunction solar cells. In this paper the effect of the processing additive octane-dithiol on the charge transfer emission in poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]-dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is investigated. Despite the fact that blends processed with and without additive show a ground state charge transfer optical absorption only the blend processed without additive shows a corresponding charge transfer emission. The presented experimental data show that the nano-morphology of the bulk-heterojunction blends plays an important role for the formation of emissive charge transfer excitons, and that it is a loss channel in the studied solar cells.

Graphical abstract: Charge transfer excitons in low band gap polymer based solar cells and the role of processing additives

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Jul 2011, accepted on 29 Sep 2011 and first published on 21 Oct 2011


Article type: Paper
DOI: 10.1039/C1EE02181H
Citation: Energy Environ. Sci., 2011,4, 5077-5083
  •   Request permissions

    Charge transfer excitons in low band gap polymer based solar cells and the role of processing additives

    M. C. Scharber, C. Lungenschmied, H. Egelhaaf, G. Matt, M. Bednorz, T. Fromherz, J. Gao, D. Jarzab and M. A. Loi, Energy Environ. Sci., 2011, 4, 5077
    DOI: 10.1039/C1EE02181H

Search articles by author

Spotlight

Advertisements