Charge storage in doped poly(thiophene): Optical and electrochemical studies

Tze-chiang Chung, J. H. Kaufman, A. J. Heeger, F. Wudl

Research output: Contribution to journalArticle

596 Citations (Scopus)

Abstract

We present a new method of electrochemical polymerization of poly(thiophene) using dithiophene as the starting material, from which we obtain a high-quality film with a sharp interband absorption edge. An in situ study of the absorption spectrum during the electrochemical doping process has been carried out. In the dilute regime, the results are in detailed agreement with charge storage via bipolarons; weakly confined soliton pairs with confinement parameter 0.1-0.2. At the highest doping levels, the data are characteristic of the free-carrier absorption expected for a metal. From a parallel electrochemical voltage spectroscopy study, we find evidence of charge injection near the band edge and charge removal from the bipolaron gap states. In the dilute regime, the position of the chemical potential is consistent with charge storage in weakly confined bipolarons. The high Coulombic recovery over a charge-discharge cycle indicates that poly (thiophene) may be an excellent cathode-active material in battery applications.

Original languageEnglish (US)
Pages (from-to)702-710
Number of pages9
JournalPhysical Review B
Volume30
Issue number2
DOIs
StatePublished - Jan 1 1984

Fingerprint

Thiophenes
Thiophene
thiophenes
Doping (additives)
Charge injection
Electropolymerization
Chemical potential
Solitons
electric batteries
Absorption spectra
Cathodes
polymerization
solitary waves
cathodes
Metals
recovery
Spectroscopy
injection
absorption spectra
Recovery

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Chung, Tze-chiang ; Kaufman, J. H. ; Heeger, A. J. ; Wudl, F. / Charge storage in doped poly(thiophene) : Optical and electrochemical studies. In: Physical Review B. 1984 ; Vol. 30, No. 2. pp. 702-710.
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Charge storage in doped poly(thiophene) : Optical and electrochemical studies. / Chung, Tze-chiang; Kaufman, J. H.; Heeger, A. J.; Wudl, F.

In: Physical Review B, Vol. 30, No. 2, 01.01.1984, p. 702-710.

Research output: Contribution to journalArticle

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AB - We present a new method of electrochemical polymerization of poly(thiophene) using dithiophene as the starting material, from which we obtain a high-quality film with a sharp interband absorption edge. An in situ study of the absorption spectrum during the electrochemical doping process has been carried out. In the dilute regime, the results are in detailed agreement with charge storage via bipolarons; weakly confined soliton pairs with confinement parameter 0.1-0.2. At the highest doping levels, the data are characteristic of the free-carrier absorption expected for a metal. From a parallel electrochemical voltage spectroscopy study, we find evidence of charge injection near the band edge and charge removal from the bipolaron gap states. In the dilute regime, the position of the chemical potential is consistent with charge storage in weakly confined bipolarons. The high Coulombic recovery over a charge-discharge cycle indicates that poly (thiophene) may be an excellent cathode-active material in battery applications.

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