Accession Number : ADA137085
Title : Charge Storage in Doped Poly(thiophene).
Descriptive Note : Technical rept.,
Corporate Author : CALIFORNIA UNIV SANTA BARBARA INST FOR POLYMERS AND ORGANIC SOLIDS
Personal Author(s) : Chung,T C ; Kaufman,J H ; Heeger,A J ; Wudl,F
PDF Url : ADA137085
Report Date : 06 Jan 1984
Pagination or Media Count : 26
Abstract : This paper presents a new method of electrochemical polymerization of poly(thiophene) using dithiphene as the starting material, from which a high quality film with a sharp interband absorption edge is obtained. 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 gamma = 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 (EVS) 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(thiphene) may be an excellent cathode-active material in battery applications.
Descriptors : *Electrochemistry, *Polymerization, *Thiophenes, *Electric charge, *Energy storage, Films, Absorption, Absorption spectra, Doping, Bipolar systems, Voltage, Spectroscopy, Injection, Charge transfer, Electrical conductivity, Electrolytes, Electrodes
Subject Categories : Atomic and Molecular Physics and Spectroscopy
Distribution Statement : APPROVED FOR PUBLIC RELEASE