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Synthesis and characterization of a pentaselenophene-based donor–acceptor copolymer for use in organic photovoltaic cells
- Source :
-
Solar Energy Materials & Solar Cells . Mar2013, Vol. 110, p140-146. 7p. - Publication Year :
- 2013
-
Abstract
- Abstract: A new conjugated polymer containing pentaselenophene (5Se) electron donor moieties was designed for use in polymer solar cells and synthesized via a Stille coupling reaction. The structure, optical properties, electrochemical properties, hole mobility, photovoltaic properties, and AFM morphology of the homopolymer (P5Se) and the donor–acceptor copolymer (P5SeDTDPP) with a diketopyrrolopyrrole (DPP) acceptor were investigated and are discussed. The polymers showed good solubility, film-forming properties, and thermal stabilities. P5Se exhibited a broad absorption across the visible range, 400–700nm, which is a prerequisite for photovoltaic applications. P5SeDTDPP yielded a broader absorption spectrum, enhanced π–π interactions, and a lower band gap compared to P5Se, due to the enhanced intramolecular charge transfer interactions between the donating moiety (pentaselenophene) and the DPP accepting moiety. Solution-processed field effect transistors fabricated from these polymers displayed p-type organic thin film transistor characteristics. P5Se and P5SeDTDPP exhibited typical p-type organic semiconductor characteristics with hole mobilities of 2.3×10−3 and 1.2×10–2 cm2 V−1 s−1, respectively. Photovoltaic devices were fabricated using polymer:PCBM blends in ITO/PEDOT:PSS/blend/Al structures. The P5SeDTDPP device exhibited an open circuit voltage (V OC) of 0.44V, a short circuit current (J SC) of 10.67mA/cm2, a fill factor (FF) of 0.51, and a power conversion efficiency (PCE) of 2.40% under AM 1.5G (100mW/cm2) conditions. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09270248
- Volume :
- 110
- Database :
- Academic Search Index
- Journal :
- Solar Energy Materials & Solar Cells
- Publication Type :
- Academic Journal
- Accession number :
- 85174314
- Full Text :
- https://doi.org/10.1016/j.solmat.2012.12.032