Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/1952
Title: Optical absorption by defect states in organic solar cells
Authors: GORIS, Ludwig 
Poruba, A
Purkrt, A
VANDEWAL, Koen 
SWINNEN, Ann 
HAELDERMANS, Ilse 
HAENEN, Ken 
MANCA, Jean 
Vanecek, M
Issue Date: 2006
Publisher: ELSEVIER SCIENCE BV
Source: JOURNAL OF NON-CRYSTALLINE SOLIDS, 352(9-20). p. 1656-1659
Abstract: Organic bulk heterojunction solar cells enjoy a well established reputation, reaching conversion efficiencies up to 4% at present. Information on electronic states in the gap, whether or not connected with defects, that can influence the power conversion efficiency, are still lacking. A photoelectrical study of the optical absorption processes in encapsulated cells is presented. Fourier-transform photocurrent spectroscopy is used to measure the transitions connected with free charge carrier generation. The dynamic range obtained with this method reaches over at least eight orders of magnitude. Measurements on solar cells with an active layer of MDMO-PPV:PCBM (1:4 weight ratio) enabled a study of the intrinsic defect generation due to UV-illumination. Temperature annealing effects in P3HT:PCBM (1:2 weight ratio) cells and the induced morphological changes are related with the changes in absorption spectrum. These morphological changes were separately probed with optical and transmission electron microscopy. (c) 2006 Elsevier B.V. All rights reserved.
Notes: Hasselt Univ, Mat Res Inst, B-3590 Diepenbeek, Belgium. Acad Sci Czech Republ, Inst Phys, CR-16200 Prague 6, Czech Republic. IMEC VZW, Div IMOMEC, B-3590 Diepenbeek, Belgium.Goris, L, Hasselt Univ, Mat Res Inst, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.ludwig.goris@uhasselt.be
Keywords: solar cells; composition; photovoltaics; band structure; optical spectroscopy; STEM/TEM; defects; nano-composites; absorption; FTIR measurements; polymers and organics; defects
Document URI: http://hdl.handle.net/1942/1952
ISSN: 0022-3093
e-ISSN: 1873-4812
DOI: 10.1016/j.jnoncrysol.2005.09.053
ISI #: 000238782900189
Category: A1
Type: Journal Contribution
Validations: ecoom 2007
Appears in Collections:Research publications

Show full item record

SCOPUSTM   
Citations

15
checked on Sep 2, 2020

WEB OF SCIENCETM
Citations

13
checked on May 21, 2022

Page view(s)

48
checked on May 24, 2022

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.