TY - GEN
T1 - Reduced Coulomb interaction in organic solar cells by the introduction of high-k SrTiO3 nanoparticles
AU - Benson, Niels
AU - Engel, Miriam
AU - Schaefer, David
AU - Erni, Daniel
AU - Kern, Julia
AU - Deibel, Carsten
AU - Herzig, Eva M.
AU - Muller-Buschbaum, Peter
AU - Schmechel, Roland
PY - 2013
Y1 - 2013
N2 - A concept is introduced which allows for reduced Coulomb interaction in organic solar cells and as such for enhanced power conversion efficiencies. The concept is based on the introduction of electrically insulating, nanostructured high-k materials into the organic matrix, which do not contribute to the charge carrier transport, however, enhance the effective permittivity of the organic active layer. Using an analytical model, it is demonstrated that even at a distance of 20 nm to the organic/inorganic interface of the nanostructure, the Coulomb interaction in the organic semiconductor can be reduced by more than 15 %. The concept is substantiated experimentally by realizing P3HT:PCBM solar cells with integrated SrTiO3 nanoparticles. It could be demonstrated that in comparison to a reference cells without nanoparticles, the power conversion efficiency is improved by ∼17 %. This effect is interpreted to be the result of an organic active layer effective permittivity enhancement, which is supported by the result of transient absorption as well as grazing incidence wide angle x-ray scattering measurements.
AB - A concept is introduced which allows for reduced Coulomb interaction in organic solar cells and as such for enhanced power conversion efficiencies. The concept is based on the introduction of electrically insulating, nanostructured high-k materials into the organic matrix, which do not contribute to the charge carrier transport, however, enhance the effective permittivity of the organic active layer. Using an analytical model, it is demonstrated that even at a distance of 20 nm to the organic/inorganic interface of the nanostructure, the Coulomb interaction in the organic semiconductor can be reduced by more than 15 %. The concept is substantiated experimentally by realizing P3HT:PCBM solar cells with integrated SrTiO3 nanoparticles. It could be demonstrated that in comparison to a reference cells without nanoparticles, the power conversion efficiency is improved by ∼17 %. This effect is interpreted to be the result of an organic active layer effective permittivity enhancement, which is supported by the result of transient absorption as well as grazing incidence wide angle x-ray scattering measurements.
KW - High-k organic semiconductors
KW - Organic PV
KW - Reduced Coulomb interaction
UR - http://www.scopus.com/inward/record.url?scp=84896466485&partnerID=8YFLogxK
U2 - 10.1109/PVSC.2013.6745113
DO - 10.1109/PVSC.2013.6745113
M3 - Conference contribution
AN - SCOPUS:84896466485
SN - 9781479932993
T3 - Conference Record of the IEEE Photovoltaic Specialists Conference
SP - 3086
EP - 3091
BT - 39th IEEE Photovoltaic Specialists Conference, PVSC 2013
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 39th IEEE Photovoltaic Specialists Conference, PVSC 2013
Y2 - 16 June 2013 through 21 June 2013
ER -