Highly sensitive spectroscopic characterization of inorganic and organic heterojunctions for solar cells

Issue		Eur. Phys. J. Appl. Phys. Volume 36, Number 3, December 2006


Page(s)		281 - 283
Section		Characterization of Materials: Imaging,\ Microscopy and Spectroscopy
DOI		10.1051/epjap:2006140

Eur. Phys. J. Appl. Phys. 36, 281-283 (2006)
DOI: 10.1051/epjap:2006140

Highly sensitive spectroscopic characterization of inorganic and organic heterojunctions for solar cells

K. Vandewal¹, L. Goris¹, K. Haenen¹, Y. Geerts² and J.V. Manca¹

¹ Institute for Materials Research, Hasselt University, and IMEC, Division IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
² Laboratoire de Chimie des Polymres, Universit libre de Bruxelles, Campus de la Plaine, CP206/01, boulevard du Triomphe, 1050 Bruxelles, Belgium

koen.vandewal@uhasselt.be

(Received: 25 July 2006 / Accepted 28 September 2006 / Published online: 6 December 2006)

Abstract
Sub-bandgap absorption features ( $\alpha \le 100$ cm^-1) have been detected in organic and inorganic semiconductors and their heterojunctions. Photothermal deflection spectroscopy (PDS) is used to increase the detection limit considerably with respect to common absorption spectroscopy. Results are presented on discotic liquid crystals, donor-acceptor complex formation in P3HT:PCBM solar cells and UV-induced defect generation in nanoporous TiO₂.

PACS
78.20.-e - Optical properties of bulk materials and thin films.
78.40.Me - Organic compounds and polymers.
78.55.Mb - Porous materials.

© EDP Sciences 2006

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