The design, synthesis, and characterization of a new family of soluble extended arylacetylene optoelectronic materials, is reported. Trends in optical absorption spectra and electrochemical redox processes are first described. Next, the thin-film microstructures and morphologies of films deposited from solution under various conditions are investigated, and organic field-effect transistors (OFETs) and bulk heterojunction photovoltaic (OPV) cells fabricated. OFET measurements reveal that all seven of the semiconductors are FET-active and, depending on the backbone architecture, the arylacetylenes exhibit good p-type mobilities when optimum film microstructural order is achieved. OPV cells using [6,6]-phenyl C61-butyric acid methyl ester (PCBM) as the electron acceptor exhibit power conversion efficiencies up to 1.3% under a simulated AM 1.5 solar irradiation of 100 mW/cm2. These PCEs rank among the highest reported at a time for cells based on non polymeric conjugated small molecules. A direct correlation between OFET arylacetylene hole mobility and OPV performance is identified and analyzed.
Solution-Processable Low-Molecular Weight Extended Arylacetylenes: Versatile p-Type Semiconductors for Field-Effect Transistors and Bulk Heterojunction Solar Cells
MARROCCHI, Assunta;SERI, MIRKO;TATICCHI, Aldo
2010
Abstract
The design, synthesis, and characterization of a new family of soluble extended arylacetylene optoelectronic materials, is reported. Trends in optical absorption spectra and electrochemical redox processes are first described. Next, the thin-film microstructures and morphologies of films deposited from solution under various conditions are investigated, and organic field-effect transistors (OFETs) and bulk heterojunction photovoltaic (OPV) cells fabricated. OFET measurements reveal that all seven of the semiconductors are FET-active and, depending on the backbone architecture, the arylacetylenes exhibit good p-type mobilities when optimum film microstructural order is achieved. OPV cells using [6,6]-phenyl C61-butyric acid methyl ester (PCBM) as the electron acceptor exhibit power conversion efficiencies up to 1.3% under a simulated AM 1.5 solar irradiation of 100 mW/cm2. These PCEs rank among the highest reported at a time for cells based on non polymeric conjugated small molecules. A direct correlation between OFET arylacetylene hole mobility and OPV performance is identified and analyzed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
