Open-Circuit Photovoltage Exceeding 950 mV with an 840 mV Average at Sb₂S₃-Thianthrene^+/0 Junctions Enabled by Thioperylene Anhydride Back Contacts.

ABSTRACT: Covalently attached perylene monolayers serve as back contacts for Sb₂S₃ photoelectrochemical cells with a thianthrene^+/0 front, rectifying contact. Covalent attachment of perylenetetracarboxylic dianhydride, PTCDA, to Si(111) utilizes an anhydride-to-imide conversion at surface-attached amines. For Sb₂S₃ solar absorbers, we hypothesized that a terminal thioperylene anhydride, i.e., S=C-O-C=S, formed from thionation of the terminal perylene anhydride would serve as a soft, electron-selective and hole-blocking back contact. We explored several routes to convert carbonyls to thiocarbonyls on surface-attached perylene anhydrides including Lawesson's reagent, P₄S₁₀, and a P₄S₁₀-pyridine complex.

SUBMITTER: Doiron CW 

PROVIDER: S-EPMC7364746 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature