Please use this identifier to cite or link to this item:
http://hdl.handle.net/1942/8450
Title: | The relation between open-circuit voltage and the onset of photocurrent generation by charge-transfer absorption in polymer: Fullerene bulk heterojunction solar cells | Authors: | VANDEWAL, Koen GADISA DINKU, Abay OOSTERBAAN, Wibren BERTHO, Sabine BANISHOEIB, Fateme VAN SEVEREN, Ineke LUTSEN, Laurence CLEIJ, Thomas VANDERZANDE, Dirk MANCA, Jean |
Issue Date: | 2008 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | ADVANCED FUNCTIONAL MATERIALS, 18(14). p. 2064-2070 | Abstract: | Photocurrent generation by charge-transfer (CT) absorption is detected in a range of conjugated polymer-[6,61-phenyl C61 butyric acid methyl ester (PCBM) based solar cells. The low intensity CT absorption bands are observed using a highly sensitive measurement of the external quantum efficiency (EQE) spectrum by means of Fourier-transform photocurrent spectroscopy (FrPS). The presence of these CT bands implies the formation of weak ground-state charge-transfer complexes in the studied polymer-fullerene blends. The effective band gap (Eg) of the material blends used in these photovoltaic devices is determined from the energetic onset of the photocurrent generated by CT absorption. It is shown that for all devices, under various preparation conditions, the open-circuit voltage (Voc) scales linearly with E, The redshift of the CT band upon thermal annealing of regioregular poly(3-hexylthiophene):PCBM and thermal aging of poly(phenylenevinylene)(PPV):PCBM photovoltaic devices correlates with the observed drop in open-circuit voltage of high-temperature treated versus untreated devices. Increasing the weight fraction of PCBM also results in a redshift of Eg, proportional with the observed changes in Vo, for different PPV:PCBM ratios. As E9 corresponds with the effective bandgap of the material blends, a measurement of the EQE spectrum by FTPS allows us to measure this energy directly on photovoltaic devices, and makes it a valuable technique in the study of organic bulk heterojunction solar cells. | Notes: | Hasselt Univ, Inst Mat Res, B-3590 Diepenbeek, Belgium. IMEC IMOMEC Vzw, B-3590 Diepenbeek, Belgium. | Document URI: | http://hdl.handle.net/1942/8450 | ISSN: | 1616-301X | e-ISSN: | 1616-3028 | DOI: | 10.1002/adfm.200800056 | ISI #: | 000258166900008 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2009 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
relation.pdf | 289.07 kB | Adobe PDF | View/Open |
SCOPUSTM
Citations
439
checked on Sep 3, 2020
WEB OF SCIENCETM
Citations
489
checked on Oct 14, 2024
Page view(s)
96
checked on May 1, 2023
Download(s)
626
checked on May 1, 2023
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.