科研之友
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摘要
One of the challenges in the field of organic photovoltaics is developing alternatives to the family of fullerene derivatives that are commonly used as acceptor material but that generally lack strong optical absorption coefficient. We describe the synthesis and optoelectronic properties of three new acceptor electron acceptor polymers that use the alternation of thiophene units and electron-deficient units as a common design theme. The acceptor polymers are combined with poly(3-hexylthiophene) as electron donor material in bulk heterojunction solar cells. The performance of the photovoltaic devices is limited by incomplete exciton dissociation and a sluggish separation of the photogenerated electrons and holes at low fields. The separation is in competition with charge recombination to the triplet state. In addition, the low electron mobility in the acceptor polymers hampers charge collection.
- 出版日期2011-2-24
