Charge carrier dynamics of polymer: Fullerene blends: From geminate to non-geminate recombination
Journal article, 2014

The charge carrier dynamics of a new polymer-fullerene blend are examined on the femtosecond to the millisecond time scale. The full time range is globally fitted using a chemical reaction rate model that includes all key processes, charge generation, energy transfer, charge separation, and recombination, over the full 12 orders of magnitude in time and a factor of 33 in light intensity. Particular attention is paid to the charge recombination processes and it is found that they are highly material specific. Comparison of the dynamics to those of a previously studied polymer:fullerene blend reveals that while for one blend the recombination dynamics are mainly controlled by geminate recombination, the charge recombination in the presently studied polymer:fullerene blend are entirely controlled by non-geminate electron-hole recombination. Carrier density dependence of the non-geminate recombination rate is analyzed and a correlated disorder model of site energies is proposed to explain the observed dependency. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Recombination dynamics

Nongeminate recombination

Organic solar cells


D.A. Vithanage

Lund University

Ergang Wang

Chalmers, Chemical and Biological Engineering, Polymer Technology

Z. Wang

Linköping University

F. Ma

Lund University

O.W. Inganäs

Linköping University

Mats Andersson

Chalmers, Chemical and Biological Engineering, Polymer Technology

A.P. Yartsev

Lund University

V. Sundström

Lund University

Torbjoern Pascher

Lund University

Advanced Energy Materials

1614-6832 (ISSN) 1614-6840 (eISSN)

Vol. 4 8 1301706

Areas of Advance

Nanoscience and Nanotechnology (SO 2010-2017, EI 2018-)


Materials Science

Subject Categories

Materials Engineering

Chemical Engineering

Nano Technology

Chemical Sciences


Basic sciences



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