Efficiency enhancement in low-bandgap polymer solar cells by processing with alkane dithiols
Efficiency enhancement in low-bandgap polymer solar cells by processing with alkane dithiols
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DOI：
10.1038/nmat1928
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发表时间：
2007-07-01
期刊：
影响因子：
41.2
通讯作者：
Bazan, G. C.
中科院分区：
文献类型：
--
作者：
Peet, J.;Kim, J. Y.;Bazan, G. C.
高电荷分离效率结合与溶液处理相关的降低的制造成本以及在柔性基板上实施的潜力，使“塑料”太阳能电池成为未来光电子学的一个引人注目的选择。然而，根据实现高功率转换效率的需要来控制体异质结材料中的供体/受体形态的尝试已经取得了有限的成功。通过在用于旋转浇铸包含低带隙聚合物和富勒烯衍生物的膜的溶液中掺入几体积%的烷二硫醇，通过改变本体异质结形态，光伏电池（空气质量1.5全局条件）的功率转换效率从2.8%增加到5.5%。这一发现可能能够对热退火不受欢迎或无效的体异质结材料进行形态控制。
High charge-separation efficiency combined with the reduced fabrication costs associated with solution processing and the potential for implementation on flexible substrates make 'plastic' solar cells a compelling option for tomorrow's photovoltaics. Attempts to control the donor/acceptor morphology in bulk heterojunction materials as required for achieving high power-conversion efficiency have, however, met with limited success. By incorporating a few volume per cent of alkanedithiols in the solution used to spin-cast films comprising a low-bandgap polymer and a fullerene derivative, the power-conversion efficiency of photovoltaic cells (air-mass 1.5 global conditions) is increased from 2.8% to 5.5% through altering the bulk heterojunction morphology. This discovery can potentially enable morphological control in bulk heterojunction materials where thermal annealing is either undesirable or ineffective.