title: Photoinduced Carrier Generation and Recombination Dynamics of a Trilayer Cascade Heterojunction Composed of Poly(3-hexylthiophene), Titanyl Phthalocyanine, and C60.
abstract: We use flash-photolysis time-resolved microwave conductivity experiments (FP-TRMC) and femtosecond-nanosecond pump-probe transient absorption spectroscopy to investigate photoinduced carrier generation and recombination dynamics of a trilayer cascade heterojunction composed of poly(3-hexylthiophene) (P3HT), titanyl phthalocyanine (TiOPc), and fullerene (C60). Carrier generation following selective photoexcitation of TiOPc is independently observed at both the P3HT/TiOPc and TiOPc/C60 interfaces. The transient absorption results indicate that following initial charge generation processes to produce P3HT(•+)/TiOPc(•-) and TiOPc(•+)/C60(•-) at each interface from (P3HT/TiOPc*/C60), the final charge-separated product of (P3HT(•+)/TiOPc/C60(•-)) is responsible for the long-lived photoconductance signals in FP-TRMC. At the P3HT/TiOPc interface in both P3HT/TiOPc and P3HT/TiOPc/C60 samples, the electron transfer appears to occur only with the crystalline (weakly coupled H-aggregate) phase of the P3HT.
authors.affiliation: †Chemical and Materials Science Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States.
authors.forename: Jaehong
authors.initials: J
authors.lastname: Park
authors.affiliation: †Chemical and Materials Science Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States.|‡Department of Chemistry and Biochemistry, and Renewable and Sustainable Energy Institute, University of Colorado at Boulder, Boulder, Colorado 80309, United States.
authors.forename: Obadiah G
authors.initials: OG
authors.lastname: Reid
authors.affiliation: †Chemical and Materials Science Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States.|‡Department of Chemistry and Biochemistry, and Renewable and Sustainable Energy Institute, University of Colorado at Boulder, Boulder, Colorado 80309, United States.
authors.forename: Garry
authors.initials: G
authors.lastname: Rumbles