On the Physical Properties PEDOT:PSS Thin Films. (March 2020)

• Record Type: Journal Article
• Authors: Girtan, Mihaela; Mallet, Romain; Socol, Marcela; Stanculescu, Anca
• Is Part Of: Materials today communications. Volume 22(2020)
• Publication Date: 2020-03
• Subjects: PEDOT: PSS -- Electrical conductivity -- Photoconductivity -- Relaxation time -- Thermoelectricity -- Ellipsometry; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2019.100735
• Languages: English
• ISSNs: 2352-4928

Abstract

Graphical abstract: Highlights: Study of the optical properties and charge carriers' transport in PEDOT: PSS. Correlations of ellipsometric measurements with the electrical properties. Calculations of relaxation times of electrical conduction and photoconduction. Thermoelectric measurements and influence of surfactants. Abstract: A complete characterization from optical, morphological, electrical, photo-electrical and thermo-electrical point of view was done for PEDOT:PSS thin films and DMSO and EG sensitized PEDOT:PSS films. The studies on the electrical conductivity and electrical photoconductivity allowed the calculation of different relaxation times. The relaxation time of the electrical conductivity is of order of femtosecond and is multiplied by a factor 10 when PEDOT: PSS thin films were deposited on surfaces sensitized with DMSO and EG. Besides, the photoconduction excitation and relaxation times are of order of seconds. An increase in the relaxation photoconduction time by 2 was observed for films deposited on surfaces sensitized with DMSO and by 1.2 for films deposited on surfaces sensitized with EG. The time response of electrical conductivity after exposure to light adds supplementary knowledge for the understanding of the inertial processes, or hysteresis behavior of organic or perovskite solar cells involving PEDOT:PSS films. The electrical conductivity increases with the temperature and the use of DMSO and EG as surfactants lead to higher values of electrical conductivity and Seebeck coefficient. A better stability of the electrical conductivity with the temperature increase, was noticed for films deposited on surfaces sensitized with DMSO.