Polymer frontier orbital and morphology engineering for nanophotonics

摘要

Polymer thin film based optoelectronic devices including solar cells appear attractive for space applications wherelightweight, large size, low cost, and flexible shape are desirable. The photoelectric power conversion efficiencies ofcurrently reported polymer solar cells are still relatively low (typically less than 8% under AM 1.5 and one Sun intensity)due to several losses, i.e., the ‘photon loss’ due to mismatch of materials energy gaps versus the sunlight photon energies,the ‘exciton loss’ and the ‘carrier loss’ due to poor solid state morphologies of existing polymeric donor/acceptor binarysystems. Therefore, both molecular frontier orbitals (HOMOs, LUMOs) and phase morphologies need to be optimized tofurther enhance the efficiency. In this presentation, our recent efforts on frontier orbital and morphology engineering ofconjugated polymer blocks and corresponding block copolymers will be reviewed. The HOMO/LUMO energy gaps ofthe new polymers were in a range of 1.5-2.0 eV which are attractive for solar cell applications. The terminal functionalgroups of donor and acceptor type conjugated blocks make them potentially ideal candidates for the development ofdonor/acceptor block copolymer supramolecular nanostructures for a variety of high efficiency optoelectronicapplications. Dye sensitized triple system appear attractive for high efficiency optoelectronics due to reduction of chargerecombination.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.