Length-scale effects on electrical and thermal transport in polyaniline thin films

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Conducting polymers are prevalently used in organic and flexible electronics and energy conversion devices. While their thermo-physical properties are well characterized for different processing and doping conditions, very little is known about the effect of length-scale, especially their thermal conductivity and thermal contact resistance of their interfaces with substrates. In this paper we develop an analytical model to capture the heat transfer in ultra-thin polyaniline thin films and their interfaces with other substrate materials. The model is demonstrated on 20-1000 nm thick 50% camphor-sulphonic acid doped polyaniline films patterned on silicon substrate using photolithography and reactive ion etching. The four-probe based technique allows simultaneous electrical and thermal characterization. Experimental results show a 500% and 200% increase in the in-plane thermal conductivity and electrical conductivity, respectively as the film thickness is increased from 20 nm to 1000 nm. These findings suggest up to 300% improvement in thermoelectric performance for 20 nm thick films when compared to the bulk. Such strong length-scale effects are observed to decay rapidly after 100 nm film thickness and can be attributed to the enhanced phonon scattering at the surface and interface boundaries at length-scales comparable to phonon mean free paths.

Original languageEnglish (US)
Pages (from-to)29-35
Number of pages7
JournalOrganic Electronics
Volume11
Issue number1
DOIs
StatePublished - Jan 1 2010

Fingerprint

scale effect
Polyaniline
Thin films
Film thickness
Thermal conductivity
film thickness
Substrates
thermal conductivity
thin films
Camphor
Flexible electronics
camphor
Phonon scattering
Sulfonic Acids
sulfonic acid
Reactive ion etching
thermophysical properties
Conducting polymers
energy conversion
conducting polymers

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

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title = "Length-scale effects on electrical and thermal transport in polyaniline thin films",
abstract = "Conducting polymers are prevalently used in organic and flexible electronics and energy conversion devices. While their thermo-physical properties are well characterized for different processing and doping conditions, very little is known about the effect of length-scale, especially their thermal conductivity and thermal contact resistance of their interfaces with substrates. In this paper we develop an analytical model to capture the heat transfer in ultra-thin polyaniline thin films and their interfaces with other substrate materials. The model is demonstrated on 20-1000 nm thick 50{\%} camphor-sulphonic acid doped polyaniline films patterned on silicon substrate using photolithography and reactive ion etching. The four-probe based technique allows simultaneous electrical and thermal characterization. Experimental results show a 500{\%} and 200{\%} increase in the in-plane thermal conductivity and electrical conductivity, respectively as the film thickness is increased from 20 nm to 1000 nm. These findings suggest up to 300{\%} improvement in thermoelectric performance for 20 nm thick films when compared to the bulk. Such strong length-scale effects are observed to decay rapidly after 100 nm film thickness and can be attributed to the enhanced phonon scattering at the surface and interface boundaries at length-scales comparable to phonon mean free paths.",
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Length-scale effects on electrical and thermal transport in polyaniline thin films. / Jin, Jiezhu; Wang, Qing; Haque, Md Amanul.

In: Organic Electronics, Vol. 11, No. 1, 01.01.2010, p. 29-35.

Research output: Contribution to journalArticle

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AU - Jin, Jiezhu

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AU - Haque, Md Amanul

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AB - Conducting polymers are prevalently used in organic and flexible electronics and energy conversion devices. While their thermo-physical properties are well characterized for different processing and doping conditions, very little is known about the effect of length-scale, especially their thermal conductivity and thermal contact resistance of their interfaces with substrates. In this paper we develop an analytical model to capture the heat transfer in ultra-thin polyaniline thin films and their interfaces with other substrate materials. The model is demonstrated on 20-1000 nm thick 50% camphor-sulphonic acid doped polyaniline films patterned on silicon substrate using photolithography and reactive ion etching. The four-probe based technique allows simultaneous electrical and thermal characterization. Experimental results show a 500% and 200% increase in the in-plane thermal conductivity and electrical conductivity, respectively as the film thickness is increased from 20 nm to 1000 nm. These findings suggest up to 300% improvement in thermoelectric performance for 20 nm thick films when compared to the bulk. Such strong length-scale effects are observed to decay rapidly after 100 nm film thickness and can be attributed to the enhanced phonon scattering at the surface and interface boundaries at length-scales comparable to phonon mean free paths.

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