Solution processable low bandgap diketopyrrolopyrrole (DPP) based derivatives : novel acceptors for organic solar cells
Sonar, P., Ng, G. M., Lin, T. T., Dodabalapur, A., & Chen, Z. K. (2010) Solution processable low bandgap diketopyrrolopyrrole (DPP) based derivatives : novel acceptors for organic solar cells. Journal of Materials Chemistry, 20(18), pp. 3626-3636.
Novel low bandgap solution processable diketopyrrolopyrrole (DPP) based derivatives functionalized with electron withdrawing end capping groups (trifluoromethylphenyl and trifluorophenyl) were synthesized, and their photophysical, electrochemical and photovoltaic properties were investigated. These compounds showed optical bandgaps ranging from 1.81 to 1.94 eV and intense absorption bands that cover a wide range from 300 to 700 nm, attributed to charge transfer transition between electron rich phenylene-thienylene moieties and the electron withdrawing diketopyrrolopyrrole core. All of the compounds were found to be fluorescent in solution with an emission wavelength ranging from 600 to 800 nm. Cyclic voltammetry indicated reversible oxidation and reduction processes with tuning of HOMO-LUMO energy levels. Bulk heterojunction (BHJ) solar cells using poly(3-hexylthiophene) (P3HT) as the electron donor with these new acceptors were used for fabrication. The best power conversion efficiencies (PCE) using 1:2 donor-acceptor by weight mixture were 1% under simulated AM 1.5 solar irradiation of 100 mW cm-2. These findings suggested that a DPP core functionalized with electron accepting end-capping groups were a promising new class of solution processable low bandgap n-type organic semiconductors for organic solar cell applications.
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|Item Type:||Journal Article|
|Keywords:||Absorption band, Bulk heterojunction, Charge transfer transitions, Diketopyrrolopyrroles, Donor-acceptors, Electron donors, Electron-accepting, Electron-rich, Electronwithdrawing, Emission wavelength, End capping, Functionalized, HOMO-LUMO energies, Low bandgap, N-type organic semiconductor, Organic solar cell, Photophysical, Photovoltaic property, Poly-3-hexylthiophene, Power conversion efficiencies, Processable, Reversible oxidation, Solar irradiation, Charge transfer, Conversion efficiency, Cyclic voltammetry, Electrochemical properties, Energy gap, Heterojunctions, Ion exchange, Semiconducting organic compounds, Solar cells, Sulfur compounds, Synthesis (chemical), Electrons|
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||© 2010 The Royal Society of Chemistry.|
|Deposited On:||28 Oct 2014 00:25|
|Last Modified:||29 Oct 2014 04:49|
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