MECHANISMS AND OPTIMIZATIONS OF ORGANIC PHOTOELECTRIC PROCESSES
The relatively low power conversion efficiencies (less than 6％) of current polymer based solar cells can be attributed to the ‘photon loss, the ‘exciton loss and the ‘carrier loss. Optimizations in both spatial and energy regimes should be pursued to improve. For instance, in spatial regime, a -donor-bridge-acceptor- type block copolymer has been designed and synthesized in order to develop a desired bicontinuous ordered nano structure (BONS) type solar cell. In comparison to corresponding donor/acceptor blend type cell, the ‘BONS cell exhibited much better photovoltaic performances (Voc increased from 0.14 volt to 1.10 volt, and Jsc increased from 0.017 mA/cm2 to 0.058 mA/cm2) which is mainly due to improvement in morphology. In energy regime, the photo induced exciton dissociation would be most efficient when the corresponding donor/acceptor frontier orbital offset is equal to the exciton binding energy which is the sum of the exciton dissociation reorganization energy plus the coulomb binding potential.
S.Sun C.Zhang S.Choi T.Matos A.Ledbetter C.Bonner
Center for Materials Research, Norfolk State University Norfolk, VA 23504, USA
国际会议
2007世界太阳能大会(Proceedings of ISES Solar World Congress 2007)
北京
英文
2007-09-18（万方平台首次上网日期，不代表论文的发表时间）