The photovoltaic properties and structure of palladium tetraphenylporphyrin on tin oxide photoelectrochemical cells

Autor:	Bryan R. Hollebone, Daniel Nadezhdin, Cooper H. Langford
Rok vydání:	1981
Předmět:	Chemistry Magnetic circular dichroism Organic Chemistry Doping chemistry.chemical_element General Chemistry Electrolyte Photoelectrochemical cell Photochemistry Tin oxide Catalysis chemistry.chemical_compound Crystallinity Tetraphenylporphyrin Palladium
Zdroj:	Canadian Journal of Chemistry. 59:652-657
ISSN:	1480-3291 0008-4042
DOI:	10.1139/v81-095
Popis:	The photovoltaic properties of palladium tetraphenylporphyrin films on n-doped SnO2 transparent electrode in contact with a solution of quinone/hydroquinone are discussed as a function of the preparation of the film and history of its treatment with heat, H2, or O2/H2O. Magnetic circular dichroism (MCD) spectra of the electrodes provide guidance on film structure. There are three important results. First, MCD spectra show that photovoltaic behaviour is independent of crystallinity of the film. Second, the evolution of film behaviour as "doping" by O2/H2O occurs shows that photoprocesses occur at both the interface of the film with SnO2 and the electrolyte, leading to both photoanodic and photocathodic processes. Third, MCD spectra show that "doping" is not a surface or trace phenomenon but affects the axial ligand sensitive region of the spectra of molecules throughout the film. Transport of charge through the film by successive "redox" reactions appears to provide the simplest qualitative explanation of the results. That is, conduction is by hopping in a non-stoichiometrically oxidized film.
Databáze:	OpenAIRE
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