Photoinduced carrier generation and recombination dynamics of a trilayer cascade heterojunction composed of poly(3-hexylthiophene), titanyl phthalocyanine, and C60

Jaehong Park, Obadiah G. Reid, Gary Rumbles

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14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)7729-7739
Number of pages11
JournalJournal of Physical Chemistry B
Volume119
Issue number24
DOIs
Publication statusPublished - Jun 18 2015

Fingerprint

Photolysis
Heterojunctions
heterojunctions
cascades
Microwaves
flash
photolysis
Photoexcitation
Fullerenes
Absorption spectroscopy
microwaves
conductivity
Experiments
Pumps
Crystalline materials
photoexcitation
fullerenes
Electrons
electron transfer
absorption spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

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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.",
author = "Jaehong Park and Reid, {Obadiah G.} and Gary Rumbles",
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T1 - Photoinduced carrier generation and recombination dynamics of a trilayer cascade heterojunction composed of poly(3-hexylthiophene), titanyl phthalocyanine, and C60

AU - Park, Jaehong

AU - Reid, Obadiah G.

AU - Rumbles, Gary

PY - 2015/6/18

Y1 - 2015/6/18

N2 - 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.

AB - 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.

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