Wide-band Light Harvesting Polymers for Large Area OPVs

1. PCT/SG2010/000172 UV-vis absorbance PEDOT: PSS Al Al IMRE Mater: PCBM ITO:Glass Wide-band Light Harvesting Polymersfor Large Area OPVs Introduction Organic photovoltaic cells (OPVs) is one of the next-generation technologies for green and sustainable energy, which can be manufactured at low cost through simple processing. The availability of inherently stable, good performance materials is crucial in enabling OPVs for various commercial applications. Low bandgap polymers are generally recognized as important for OPV applications. Fig 1: UV-Vis Absorbance of IMRE’s Low Band-gap Polymers Research approach • Develop low bandgap donor polymers (Eg: 1.2 -1.8 eV) to enhance light harvesting in long wavelength region • Expand the absorption spectra of the low bandgap polymers to maximize the light absorption efficiency • Choose appropriate building blocks, to facilitate molecular packing thus achieve high mobility donor polymers for high Jsc and high Fill Factor OPV devices OPV performance Our achievements • Low bandgap polymers have wide absorption bands • Consistently high PCEs >6% have been demonstrated with our novel polymers • Large area coatings for practical devices • Non-halogen solvent processable Fig 2: Comparison of IMRE’s low bandgap polymer with P3HT as active layer in OPV testing. Fig 3: Large area OPV coatings Jsc: 12.33 mA/cm2 Voc: 0.751 V FF: 0.694 PCE: 6.43% IMRE Mater: PBCM P3HT:PBCM 3 Research Link, Singapore 117602 Email: enquiry@imre.a-star.edu.sg Website: www.imre.a-star.edu.sg Tel: (65) 6874 8111 Fax: (65) 6872 0785 Spet 2009