Open AccessRole of Polymer Fractionation in Energetic Losses and Charge Carrier Lifetimes of Polymer: Fullerene Solar Cells
Author(s) -
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
Publication year - 2015
Publication title -
the journal of physical chemistry c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.401
H-Index - 289
eISSN - 1932-7455
pISSN - 1932-7447
DOI - 10.1021/acs.jpcc.5b05709
Subject(s) - polymer , materials science , luminescence , charge carrier , electroluminescence , fullerene , open circuit voltage , optoelectronics , solar cell , analytical chemistry (journal) , photochemistry , chemical physics , voltage , chemistry , nanotechnology , organic chemistry , physics , quantum mechanics , composite material , layer (electronics)
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
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