Observation of the subgap optical absorption in polymer-fullerene blend solar cells

This letter reports on highly sensitive optical absorption measurements on organic donor-acceptor solar cells, using Fourier-transform photocurrent spectroscopy (FTPS). The spectra cover an unprecedented dynamic range of eight to nine orders of magnitude making it possible to detect defect and disor...

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Published inApplied physics letters Vol. 88; no. 5; pp. 052113 - 052113-3
Main Authors Goris, L., Poruba, A., Hod'ákova, L., Vaněček, M., Haenen, K., Nesládek, M., Wagner, P., Vanderzande, D., De Schepper, L., Manca, J. V.
Format Journal Article
LanguageEnglish
Published United States American Institute of Physics 30.01.2006
Subjects
ABSORPTION
ABSORPTION SPECTRA
ANNEALING
BUTYRIC ACID
CRYSTAL DEFECTS
FOURIER TRANSFORMATION
FULLERENES
ILLUMINANCE
LAYERS
MATERIALS SCIENCE
MORPHOLOGICAL CHANGES
PHOTOCONDUCTIVITY
POLYMERS
SOLAR CELLS
SPECTROSCOPY
ULTRAVIOLET RADIATION
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Summary:This letter reports on highly sensitive optical absorption measurements on organic donor-acceptor solar cells, using Fourier-transform photocurrent spectroscopy (FTPS). The spectra cover an unprecedented dynamic range of eight to nine orders of magnitude making it possible to detect defect and disorder related sub-band gap transitions. Direct measurements on fully encapsulated solar cells with an active layer of poly[2-methoxy-5-( 3 ′ , 7 ′ -dimethyl-octyloxy)]-p-phenylene-vinylene:(6,6)-phenyl-C61-butyric-acid (1:4 weight ratio) enabled a study of the intrinsic defect generation due to UV illumination. Solar cell temperature annealing effects in poly(3-hexylthiophene):PCBM (1:2 weight ratio) cells and the induced morphological changes are related to the changes in the absorption spectrum, as determined with FTPS.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2171492