wide-band light harvesting polymers for large area opvs

Institute of Materials Research and EngineeringInstitute of Materials Research and Engineering

Wide-band Light Harvesting PolymersWide-band Light Harvesting Polymersfor Large Area OPVsfor Large Area OPVs

Introduction

Spet 2009

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.

• 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

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 performanceOur achievements

UV

-vis abso

rban

ce

Fig 1: UV-Vis Absorbance of IMRE’s Low Band-gap Polymers

Jsc: 12.33 mA/cm2

Voc: 0.751 V

FF: 0.694

PCE: 6.43%

Fig 2: Comparison of IMRE’s low bandgap polymer with P3HT as active layer in OPV testing. Al Al

IMRE Mater: PCBM

PEDOT: PSS

ITO:Glass

P3HT:PBCMP3HT:PBCM IMRE Mater: PBCMIMRE Mater: 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

Fig 3: Large area OPV coatings

PCT/SG2010/000172