Eur. Phys. J. Appl. Phys.
Volume 36, Number 3, December 2006
|Page(s)||231 - 234|
|Section||Surfaces, Interfaces and Films|
|Published online||10 January 2007|
Hybrid solar cells based on thin-film silicon and P3HT
A first step towards nano-structured devices*
Laboratoire de chimie des surfaces et interfaces, CEA/DSM/DRECAM/SPCSI/LCSI, Centre de Saclay, Bât. 466, 91191 Gif-sur-Yvette Cedex, France
2 Laboratoire de physique des interfaces et couches minces, École polytechnique, UMR 7647, 91128 Palaiseau Cedex, France
3 Laboratoire des composants pour le solaire, CEA/DRT/LITEN/LCS, Bât. 451, 91191 Gif-sur-Yvette Cedex, France
Revised: 17 October 2006
Accepted: 24 October 2006
Published online: 10 January 2007
Hybrid concepts based on a nanoscale combination of organic and inorganic semiconductors are a promising way to enhance the cost efficiency of solar cells through a better use of the solar spectrum, a higher aspect ratio of the interface, and the good processability of polymers. A new type of solar cells has been investigated. It is based on a heterojunction between regio-regular poly(3-hexylthiophene) as an organic electron donor and silicon as an inorganic electron acceptor. In a first step towards nano-structured devices, cells made of flat thin films of these materials have been studied as a model case of the heterojunction. The materials were characterized through ellipsometry and absorption spectroscopy. The devices were studied by means of their spectral response and their I-V characteristics. By combining these results, the contribution of each layer and the mechanisms of photocurrent generation are explained. The best cells to-date show a power conversion efficiency of 1.6% under AM 1.5 illumination, with a Voc of 0.704 V and a Jsc of 4.22 mA/cm2.
PACS: 81.07.Pr – Organic-inorganic hybrid nanostructures / 73.50.Pz – Photoconduction and photovoltaic effects
© EDP Sciences, 2006
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