Effects of conjugated polymer incorporation on the morphology and energy harvesting of solution-processed, phthalocyanine-based thin films

Gary Z. Cheung, Binxing Yu, Mengdi Liu, Zheng Gong, Jesse Kohl, Christopher E. Petoukhoff, Piotr Piotrowiak, Deirdre M O'Carroll

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Here, we investigate the morphology, spectral absorption bandwidth and energy transfer in solution-processed, phthalocyanine-based thin films blended with conjugated polymer materials with complementary absorption bands. Unary, binary, and ternary solutions of the solution- processable phthalocyanine derivative 2,3,9,10,16,17,23,24-octakis(octyloxy)-29H,31H-phthalocyanine (Oct-Pc) and the conjugated polymers poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO) and poly(3-hexylthiophene) (P3HT) were used to prepare sub-55-nm-thick unary-phase and blended thin films. Spectroscopic analysis shows that absorption band full-width-at-half-maximum (FWHM) values increase from between 60 nm and 160 nm for the individual materials to greater than 450 nm for the composite ternary-blend thin film due to the complementary bandgap energies and spectral absorption bands of the constituent materials. Additionally, photoluminescence and transient absorption measurements show very efficient transfer of excited-state energy in the wider band-gap materials (donors) to the narrower band-gap material (acceptor). Resonant energy or charge transfer occurs with efficiencies between 90% and 100% for the various blends. Atomic-force microscopy and grazing-incidence, wide-angle X-ray scattering data indicate that P3HT and Oct-Pc exhibit the poorest blending. This correlates with the lowest donor photoluminescence quenching efficiency due to the extended separation of the P3HT chains from Oct-Pc molecules. However, addition of a relatively small fraction of PFO disrupts Oct-Pc crystallinity and enables improved mixing and energy transfer between P3HT and Oct-Pc.

Original languageEnglish
Pages (from-to)469-476
Number of pages8
JournalSynthetic Metals
Volume220
DOIs
Publication statusPublished - Oct 1 2016

Fingerprint

Energy harvesting
Conjugated polymers
absorption spectra
Thin films
Energy transfer
polymers
thin films
Absorption spectra
Energy gap
energy transfer
Photoluminescence
acceptor materials
donor materials
energy
photoluminescence
Spectroscopic analysis
spectroscopic analysis
energy absorption
Full width at half maximum
X ray scattering

Keywords

  • Absorption
  • Morphology
  • Organic semiconductors
  • Photoluminescence
  • Ternary blend

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Effects of conjugated polymer incorporation on the morphology and energy harvesting of solution-processed, phthalocyanine-based thin films. / Cheung, Gary Z.; Yu, Binxing; Liu, Mengdi; Gong, Zheng; Kohl, Jesse; Petoukhoff, Christopher E.; Piotrowiak, Piotr; O'Carroll, Deirdre M.

In: Synthetic Metals, Vol. 220, 01.10.2016, p. 469-476.

Research output: Contribution to journalArticle

Cheung, Gary Z. ; Yu, Binxing ; Liu, Mengdi ; Gong, Zheng ; Kohl, Jesse ; Petoukhoff, Christopher E. ; Piotrowiak, Piotr ; O'Carroll, Deirdre M. / Effects of conjugated polymer incorporation on the morphology and energy harvesting of solution-processed, phthalocyanine-based thin films. In: Synthetic Metals. 2016 ; Vol. 220. pp. 469-476.
@article{0d92ca61e3bc4663b32a6c4b660c362e,
title = "Effects of conjugated polymer incorporation on the morphology and energy harvesting of solution-processed, phthalocyanine-based thin films",
abstract = "Here, we investigate the morphology, spectral absorption bandwidth and energy transfer in solution-processed, phthalocyanine-based thin films blended with conjugated polymer materials with complementary absorption bands. Unary, binary, and ternary solutions of the solution- processable phthalocyanine derivative 2,3,9,10,16,17,23,24-octakis(octyloxy)-29H,31H-phthalocyanine (Oct-Pc) and the conjugated polymers poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO) and poly(3-hexylthiophene) (P3HT) were used to prepare sub-55-nm-thick unary-phase and blended thin films. Spectroscopic analysis shows that absorption band full-width-at-half-maximum (FWHM) values increase from between 60 nm and 160 nm for the individual materials to greater than 450 nm for the composite ternary-blend thin film due to the complementary bandgap energies and spectral absorption bands of the constituent materials. Additionally, photoluminescence and transient absorption measurements show very efficient transfer of excited-state energy in the wider band-gap materials (donors) to the narrower band-gap material (acceptor). Resonant energy or charge transfer occurs with efficiencies between 90{\%} and 100{\%} for the various blends. Atomic-force microscopy and grazing-incidence, wide-angle X-ray scattering data indicate that P3HT and Oct-Pc exhibit the poorest blending. This correlates with the lowest donor photoluminescence quenching efficiency due to the extended separation of the P3HT chains from Oct-Pc molecules. However, addition of a relatively small fraction of PFO disrupts Oct-Pc crystallinity and enables improved mixing and energy transfer between P3HT and Oct-Pc.",
keywords = "Absorption, Morphology, Organic semiconductors, Photoluminescence, Ternary blend",
author = "Cheung, {Gary Z.} and Binxing Yu and Mengdi Liu and Zheng Gong and Jesse Kohl and Petoukhoff, {Christopher E.} and Piotr Piotrowiak and O'Carroll, {Deirdre M}",
year = "2016",
month = "10",
day = "1",
doi = "10.1016/j.synthmet.2016.07.022",
language = "English",
volume = "220",
pages = "469--476",
journal = "Synthetic Metals",
issn = "0379-6779",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Effects of conjugated polymer incorporation on the morphology and energy harvesting of solution-processed, phthalocyanine-based thin films

AU - Cheung, Gary Z.

AU - Yu, Binxing

AU - Liu, Mengdi

AU - Gong, Zheng

AU - Kohl, Jesse

AU - Petoukhoff, Christopher E.

AU - Piotrowiak, Piotr

AU - O'Carroll, Deirdre M

PY - 2016/10/1

Y1 - 2016/10/1

N2 - Here, we investigate the morphology, spectral absorption bandwidth and energy transfer in solution-processed, phthalocyanine-based thin films blended with conjugated polymer materials with complementary absorption bands. Unary, binary, and ternary solutions of the solution- processable phthalocyanine derivative 2,3,9,10,16,17,23,24-octakis(octyloxy)-29H,31H-phthalocyanine (Oct-Pc) and the conjugated polymers poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO) and poly(3-hexylthiophene) (P3HT) were used to prepare sub-55-nm-thick unary-phase and blended thin films. Spectroscopic analysis shows that absorption band full-width-at-half-maximum (FWHM) values increase from between 60 nm and 160 nm for the individual materials to greater than 450 nm for the composite ternary-blend thin film due to the complementary bandgap energies and spectral absorption bands of the constituent materials. Additionally, photoluminescence and transient absorption measurements show very efficient transfer of excited-state energy in the wider band-gap materials (donors) to the narrower band-gap material (acceptor). Resonant energy or charge transfer occurs with efficiencies between 90% and 100% for the various blends. Atomic-force microscopy and grazing-incidence, wide-angle X-ray scattering data indicate that P3HT and Oct-Pc exhibit the poorest blending. This correlates with the lowest donor photoluminescence quenching efficiency due to the extended separation of the P3HT chains from Oct-Pc molecules. However, addition of a relatively small fraction of PFO disrupts Oct-Pc crystallinity and enables improved mixing and energy transfer between P3HT and Oct-Pc.

AB - Here, we investigate the morphology, spectral absorption bandwidth and energy transfer in solution-processed, phthalocyanine-based thin films blended with conjugated polymer materials with complementary absorption bands. Unary, binary, and ternary solutions of the solution- processable phthalocyanine derivative 2,3,9,10,16,17,23,24-octakis(octyloxy)-29H,31H-phthalocyanine (Oct-Pc) and the conjugated polymers poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO) and poly(3-hexylthiophene) (P3HT) were used to prepare sub-55-nm-thick unary-phase and blended thin films. Spectroscopic analysis shows that absorption band full-width-at-half-maximum (FWHM) values increase from between 60 nm and 160 nm for the individual materials to greater than 450 nm for the composite ternary-blend thin film due to the complementary bandgap energies and spectral absorption bands of the constituent materials. Additionally, photoluminescence and transient absorption measurements show very efficient transfer of excited-state energy in the wider band-gap materials (donors) to the narrower band-gap material (acceptor). Resonant energy or charge transfer occurs with efficiencies between 90% and 100% for the various blends. Atomic-force microscopy and grazing-incidence, wide-angle X-ray scattering data indicate that P3HT and Oct-Pc exhibit the poorest blending. This correlates with the lowest donor photoluminescence quenching efficiency due to the extended separation of the P3HT chains from Oct-Pc molecules. However, addition of a relatively small fraction of PFO disrupts Oct-Pc crystallinity and enables improved mixing and energy transfer between P3HT and Oct-Pc.

KW - Absorption

KW - Morphology

KW - Organic semiconductors

KW - Photoluminescence

KW - Ternary blend

UR - http://www.scopus.com/inward/record.url?scp=84979518712&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84979518712&partnerID=8YFLogxK

U2 - 10.1016/j.synthmet.2016.07.022

DO - 10.1016/j.synthmet.2016.07.022

M3 - Article

AN - SCOPUS:84979518712

VL - 220

SP - 469

EP - 476

JO - Synthetic Metals

JF - Synthetic Metals

SN - 0379-6779

ER -