Publication
Title
Understanding triplet formation pathways in bulk heterojunction polymer : fullerene photovoltaic devices
Author
Abstract
Triplet exciton (TE) formation pathways are systematically investigated in prototype bulk heterojunction (BHJ) super yellow poly(p-phenylene vinylene) (SY-PPV) solar cell devices with varying fullerene compositions using complementary optoelectrical and electrically detected magnetic resonance (EDMR) spectroscopies. It is shown that EDMR spectroscopy allows the unambiguous demonstration of fullerene triplet production in BHJ polymer:fullerene solar cells. EDMR triplet detection under selective photoexcitation of each blend component and of the interfacial charge transfer (CT) state reveals that low lying fullerene TEs are produced by direct intersystem crossing from singlet excitons (SEs). The direct CT-TE recombination pathway, although energetically feasible, is kinetically suppressed in these devices. However, high energy CT states in the CT manifold can contribute to the population of the fullerene triplet state via a direct CT-SE conversion. This undesirable energetic alignment could be one of the causes for the severe reduction in photocurrent observed when the open-circuit voltage of polymer:fullerene solar cells is pushed to 1.0 V or beyond.
Language
English
Source (journal)
Laser physics review. - Place of publication unknown
Publication
Place of publication unknown : 2015
Volume/pages
5:2(2015)
Article Reference
1401109
ISI
000348772600012
Medium
E-only publicatie
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
Faculty/Department
Research group
[E?say:metaLocaldata.cgzprojectinf]
Charge transfer in semiconducting polymer / CVD diamond heterostructures.
Imaging neural activity at the cellular- and network-levels by optically detected diamond spin-magnetometers and nanoparticle FRET sensors.
SILASOL - New Silicon Materials for Solar Applications.
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 17.02.2016
Last edited 10.09.2017
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