Electronic Structure and Interface Properties of a Model Molecule for Organic Solar Cells
2009; Wiley; Volume: 11; Issue: 1 Linguagem: Inglês
10.1002/cphc.200900626
ISSN1439-7641
AutoresHolger Hintz, Heiko Peisert, Umut Aygül, Florian Latteyer, Indro Biswas, Peter Nagel, Michael Merz, S. Schuppler, Dietrich Breusov, Sybille Allard, Ullrich Scherf, Thomas Chassé,
Tópico(s)Organic Light-Emitting Diodes Research
ResumoWe study the electronic structure of 4,7-bis(5-methylthiophen-2-yl)benzo[c][1,2,5]thiadiazole (MTBT) and its interface properties with gold using X-ray photoemission spectroscopy (XPS), valence-band ultraviolet photoemission spectroscopy (UPS), X-ray absorption spectroscopy (XAS), as well as resonant photoemission (ResPES). MTBT can be regarded as a model molecule for PCPDTBT, a promising candidate for efficient bulk heterojunction solar cells. Almost no contribution of sulfur and only a weak contribution of nitrogen to the HOMO level is found. At the interface with gold, a strong chemical interaction between the sulfur of the benzothiadiazole and gold occurs, which may have consequences for interface properties in devices.
Referência(s)