The Role of Polymer Fractionation in Energetic Losses and Charge Carrier Lifetimes of Polymer: Fullerene Solar Cells

Derya Baran, Michelle S Vezie, Nicola Gasparini, Florent Deledalle, Jizhong Yao, Bob C. Schroeder, Hugo Bronstein, Tayebeh Ameri, Thomas Kirchartz, Iain McCulloch, Jenny Nelson, Christoph J. Brabec

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Non-radiative recombination reduces the open-circuit voltage relative to its theoretical limit and leads to reduced luminescence emission at a given excitation. Therefore it is possible to correlate changes in luminescence emission with changes in open-circuit voltage and in the charge carrier lifetime. Here we use luminescence studies combined with transient photovoltage and differential charging analyses to study the effect of polymer fractionation in indacenoedithiophene-co-benzothiadiazole (IDTBT):fullerene solar cells. In this system, polymer fractionation increases electroluminescence and reduces non-radiative recombination. High molecular weight and fractionated IDTBT polymers exhibit higher carrier lifetime-mobility product compared to their non-fractionated analogues, resulting in improved solar cell performance.
Original languageEnglish (US)
Pages (from-to)19668-19673
Number of pages6
JournalThe Journal of Physical Chemistry C
Volume119
Issue number34
DOIs
StatePublished - Aug 17 2015

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