Print Email Facebook Twitter Enhanced photoluminescence at poly(3-octyl-thiophene)/TiO2 interfaces Title Enhanced photoluminescence at poly(3-octyl-thiophene)/TiO2 interfaces Author Van der Zanden, B. Van de Krol, R. Schoonman, J. Goossens, A. Faculty Applied Sciences Department DelftChemTech Date 2004-04-05 Abstract The photoluminescence (PL) of poly(3-octyl-thiophene) (P3OT) thin films applied on TiO2 substrates is compared to the PL of P3OT films applied on quartz. Quenching of excitons occurs at the P3OT/TiO2 interface and not at the P3OT/quartz interface. Yet, in the former case the PL intensity is stronger than in the latter. In particular, P3OT films less than 5 nm thick lumines much more when applied on TiO2, which is in striking contrast to what one expects. For films thicker than 10 nm, the increase of the PL as function of the film thickness is the same for TiO2 and for quartz, which indicates that the PL enhancement originates at the interface. The dissociation of excitons at the P3OT/TiO2 interface yields positive polarons in P3OT, which is not the case at the P3OT/quartz interface. We postulate that interaction between positive polarons and excitons explain the observed enhancement of the PL at the P3OT/TiO2 interface. Subject polymer filmstitanium compoundsphotoluminescenceradiation quenchingpolaronsexcitons To reference this document use: http://resolver.tudelft.nl/uuid:86db11a6-279d-42af-b179-756e4836bb5c DOI https://doi.org/10.1063/1.1699447 Publisher American Institute of Physics ISSN 0003-6951 Source http://link.aip.org/link/APPLAB/v84/i14/p2539/s1 Source Applied Physics Letters, 84 (14), 2004 Part of collection Institutional Repository Document type journal article Rights (c) 2004 The Author(s); American Institute of Physics Files PDF vanderZanden_2004.pdf 55.05 KB Close viewer /islandora/object/uuid:86db11a6-279d-42af-b179-756e4836bb5c/datastream/OBJ/view