Novel donor-acceptor low band gap copolymers for bulkheterojunction (BHJ) solar cells

Journal of Material Sciences & Engineering

ISSN: 2169-0022

Open Access

Novel donor-acceptor low band gap copolymers for bulkheterojunction (BHJ) solar cells

2nd International Conference and Exhibition on Materials Science & Engineering

October 07-09, 2013 Hampton Inn Tropicana, Las Vegas, NV, USA

Athanasius J. Manji, Patrick J. Murphy and Igor F. Perepixhka

Accepted Abstracts: J Material Sci

Abstract :

Tremendous advances have been achieved over the past decade in the area of design and synthesis of novel conjugated polymers for bulk heterojunction (BHJ) solar cells and light emitting diodes (LEDs). With ingenious use of variety of synthetic techniques, researchers have synthesised copolymers with optimized physical properties. For instance, an organic photovoltaic (OPV) material showing a record-breaking power conversion efficiency (PCE) of 10 ▒ 0.3 % has been reported recently [1]. In the design of semiconducting copolymers, the donor-acceptor (DA) approach has been found to afford low band gap (LBG) copolymers with broad absorptionto efficiently harvest solar energy [2,3]. Here we report the synthesis of two novel LBG copolymers (PFDEBT and PFDES) and studies of their photo-physical and electrochemical properties, for prospective use in organic electronics. PFDEBT with benzothiadiazole acceptor moiety demonstrated bathochromic shift of absorption from 578 nm in solution to 591 nm in the solid state with an optical band gap of 1.69 eV, while PFDES containingdibenzothiophene-S,S-dioxide unit showed absorption at 489 and 494 nm in both the liquid and solid states respectively with an optical band gap of 2.25 eV. Both polymers are highly emissive materials; with the former emitting in the red region of the emission spectrum attaining emission λmax of 709 nm and 28% photoluminescence quantum yield (PL Φ) in solution, while the later emits in the green region with an emission λmaxof 517 nm and 55% PL Φ. The HOMO energy levels of the polymers estimated from cyclic voltammetry analysis are - 4.9 and - 5.1 respectively. Preliminary studies of BHJ solar devices ofthe blend of these copolymers with PC60BM showed PCE of 1.45% and 1.1% for PFDEBT and PFDES respectively for non-optimised devices.p Keywords: donor-acceptor conjugated polymers, low band gap, organic photovoltaicand organic light emitting diodes.

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