Tin(II) thiocyanate Sn(SCN)\(_2\) as an ultrathin anode interlayer in organic photovoltaics

We report the application of a coordination polymer semiconductor, tin(II) thiocyanate [Sn(SCN)\(_2\)] as an ultrathin anode interlayer in organic photovoltaics (OPVs). Sub-10 nm layers of Sn(SCN)\(_2\) with high smoothness and excellent transparency having an optical band gap of 3.9 eV were deposit...

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Bibliographic Details
Published inarXiv.org
Main Authors Chaopaknam, Jidapa, Wechwithayakhlung, Chayanit, Nakajima, Hideki, Lertvanithphol, Tossaporn, Horprathum, Mati, Sudyoadsuk, Taweesak, Promarak, Vinich, Saeki, Akinori, Pattanasattayavong, Pichaya
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 12.08.2021
Subjects
Anodes
Coordination polymers
Electronic devices
Energy conversion efficiency
Energy levels
Excitons
Interlayers
Optical properties
Photovoltaic cells
Room temperature
Smoothness
Thiocyanates
Tin
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Summary:We report the application of a coordination polymer semiconductor, tin(II) thiocyanate [Sn(SCN)\(_2\)] as an ultrathin anode interlayer in organic photovoltaics (OPVs). Sub-10 nm layers of Sn(SCN)\(_2\) with high smoothness and excellent transparency having an optical band gap of 3.9 eV were deposited from an alcohol-based solution at room temperature without post-deposition annealing. Inserting Sn(SCN)\(_2\) as an anode interlayer in polymer:fullerene OPVs drastically reduces the recombination loss due to the exciton-blocking energy levels of Sn(SCN)\(_2\). At the optimum thickness of 7 nm, an average power conversion efficiency (PCE) of 7.6% and a maximum of 8.1% were obtained. The simple processability using common solvents gives Sn(SCN)\(_2\) a distinct advantage over the more well-known copper(I) thiocyanate (CuSCN). The electronic and optical properties of Sn(SCN)\(_2\) make it interesting for applications in large-area electronic devices.
ISSN:2331-8422
DOI:10.48550/arxiv.2105.01024