Supramolecular Organic-Inorganic Domains Integrating Fullerene- based Acceptors with Polyoxometalate-bis-Pyrene Tweezers for Organic Photovoltaic Applications

GIANCANE, GABRIELE; BETTINI, SIMONA; VALLI, LUDOVICO; BRACAMONTE, VICTORIA; CARRARO, MAURO; BONCHIO, MARCELLA; PRATO, MAURIZIO

Journal of Materials Chemistry C

Royal Society of Chemistry

Año: 2021

2050-7526

strategy to improve organic photovoltaics, and to enhance the device efficiency, builds on the design of interfacial layers (IFL) materials implementing the performance of the photoactive acceptor/donor system. A novel IFL blend has been engineered by a supramolecular organic-inorganic heterojunction integrating polyoxometalate-bis-pyrene (pyrPOM) receptors that can selectively bind fullerene-based acceptors through π-π interactions and in particular the most used phenyl-C61-butyric acid methyl ester (PCBM) PCBM. The resulting pyrPOM@PCBM IFL assembled by means of the Langmuir-Blodgett approach, has been fully characterized both in solution and on solid supports by means of the Langmuir-Schaefer method, featuring a high dielectric function, good polarizability and piezo-responsive behaviour, which suggest ferroelectric properties. An organic solar cell is realized interposing the IFL between poly(3-hexylthiophene) (P3HT) as polymer donor donor and the PCBM acceptor layers,