PCT SG 2010 000172 Institute of Materials Research and Engineering

PCT/SG 2010/000172 Institute of Materials Research and Engineering Wide-band Light Harvesting Polymers for 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 UV-vis absorbance • Develop low bandgap donor polymers (Eg: 1. 2 -1. 8 e. V) 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 Al Fig 3: Large area OPV coatings P 3 HT: PBCM Al PEDOT: PSS Fig 2: Comparison of IMRE’s low bandgap polymer with P 3 HT as active layer in OPV testing. IMRE Mater: PCBM ITO: Glass IMRE Mater: PBCM Jsc: 12. 33 m. A/cm 2 Voc: 0. 751 V FF: 0. 694 PCE: 6. 43% 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