Photoelectrochemical, Optical, and Dielectric Studies on Photoactive Assemblies Prepared from Silver Orthophosphate and 2,2 bithiophene in Thermoplastic Gel Electrolyte

An n/p organic/inorganic interface[IOI] assembly consists of poly 2,2 bithiophene [PBTh] as a p-type semiconductor and silver orthophosphate [Ag3PO4] were subjected to photoelectrochemical [PEC], optical, and electrochemical impedance spectroscopy [EIS] studies in thermoplastic gel electrolyte [TPGE...

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Bibliographic Details
Published in:International journal of electrochemical science 2022-08, Vol.17 (8), p.22082, Article 22082
Main Authors: Kasem, Kasem K., Douglas, Heaven Power
Format: Article
Language:English
Subjects:
Gel electrolyte
Impedance studies
photoactive polymer
Photoelectrochemistry
Silver Phosphate
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Summary:An n/p organic/inorganic interface[IOI] assembly consists of poly 2,2 bithiophene [PBTh] as a p-type semiconductor and silver orthophosphate [Ag3PO4] were subjected to photoelectrochemical [PEC], optical, and electrochemical impedance spectroscopy [EIS] studies in thermoplastic gel electrolyte [TPGE], consisting of polyethylene glycol [PEG]/I2/I-. Optical studies show that the occlusion of Ag3PO4 in PBTh created hybrid sub-bands with smaller band gaps between the highest occupied molecular orbitals [HOMO] and lowest unoccupied molecular orbitals [LUMO] of the host polymer. Studies also showed that the occlusion of Ag3PO4 into PBTh matrix network increased the generated photocurrent and further prolonged the lifetime of photo-generated charges. EIS studies show that charge carrier transport takes place by hopping transport, which is consistent with the amorphous, non-crystalline nature of the studied assemblies. Both silver and phosphate ions contributed to the enhancement of the photo-activities of PBTh by doping of Ag atoms in PBTh, and phosphate anions prolonged the lifetime of photogenerated charges created in the surface layers. The assembly showed stability and resistance of photodegradation as evident from the regeneration of the same photoresponse after a longer period of operation.
ISSN:1452-3981
1452-3981
DOI:10.20964/2022.08.04