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Impedance Spectroscopy and Dielectric Relaxation of Imidazole-Substituted Palladium(II) Phthalocyanine (ImPdPc) for Organic Solar Cells.

Authors :
Chakroun R
Jamoussi B
Al-Mur B
Timoumi A
Essalah K
Source :
ACS omega [ACS Omega] 2021 Apr 16; Vol. 6 (16), pp. 10655-10667. Date of Electronic Publication: 2021 Apr 16 (Print Publication: 2021).
Publication Year :
2021

Abstract

In this study, we investigated the potential of palladium tetrakis (imidazole) phthalocyanine (PdPc(Imz) <subscript>4</subscript> ) for use as an organic semiconductor for improving the photovoltaic performance. In order to get more information about the prevailing model of the conduction mechanism (correlated barrier hopping (CBH)) for PdPc(Imz) <subscript>4</subscript> , electrical impedance measurements were performed at different temperatures and the obtained data were simulated by the Kohlraush Williams Watt (KWW) approach. Theoretical studies (density functional theory (DFT)) were performed and molecular electrostatic potential (MEP) maps were also extracted to understand the relationship between the molecular structures and the molecular electronic structure of PdPc(Imz) <subscript>4</subscript> and its semiconductor properties. Furthermore, studies on the AC electrical process as a function of temperature highlighted a hopping charge transport according to an equivalent electrical circuit composed of a parallel constant-phase element (CPE), capacitance in the grain boundary layer ( C <subscript>g</subscript> ), and resistance of the grain boundary ( R <subscript>g</subscript> ). To improve interpretation of the results, an in-depth analysis of the behavior of the electric transport was conducted. As a result, the correlated barrier hopping (CBH) conduction mechanism was shown to be the most suitable predominant conduction mechanism.<br />Competing Interests: The authors declare no competing financial interest.<br /> (© 2021 The Authors. Published by American Chemical Society.)

Details

Language :
English
ISSN :
2470-1343
Volume :
6
Issue :
16
Database :
MEDLINE
Journal :
ACS omega
Publication Type :
Academic Journal
Accession number :
34056219
Full Text :
https://doi.org/10.1021/acsomega.1c00034