Abstract

Advances in organic photovoltaic technologies have been geared toward industrial high-throughput printing manufacturing, which requires insensitivity of photovoltaic performance regarding to the light-harvesting layer thickness. However, the thickness of light-harvesting layer for all polymer solar cells (all-PSCs) is often limited to about 100 nm due to the dramatically decreased fill factor upon increasing film thickness, which hampers the light harvesting capability to increase the power conversion efficiency, and is unfavorable for fabricating large-area devices. Here we demonstrate that by tuning the bulk heterojunction morphology using a non-halogenated solvent, cyclopentyl methyl ether, in the presence of a green solvent additive of dibenzyl ether, the power conversion efficiency of all-PSCs with photoactive layer thicknesses of over 500 nm reached an impressively high value of 9%. The generic applicability of this green solvent additive to boost the power conversion efficiency of thick-film devices is also validated in various bulk heterojunction active layer systems, thus representing a promising approach for the fabrication of all-PSCs toward industrial production, as well as further commercialization.

中文翻译：

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使用绿色溶剂添加剂实现高效的厚膜全聚合物太阳能电池

摘要

有机光伏技术的进步已经朝着工业高通量印刷制造发展，该工业需要对光收集层厚度不敏感的光伏性能。然而，由于在增加膜厚度时填充因子急剧降低，所有聚合物太阳能电池（所有PSC）的光收集层的厚度通常限制在约100 nm，这阻碍了光收集能力以提高功率转换效率，不利于制造大面积设备。在这里，我们证明了在存在二苄基醚的绿色溶剂添加剂的情况下，使用非卤代溶剂环戊基甲基醚调节本体异质结的形态，光敏层厚度超过500 nm的全PSC的功率转换效率达到了令人印象深刻的9％。这种绿色溶剂添加剂在提高厚膜器件的功率转换效率方面的普遍适用性也已在各种体异质结有源层系统中得到验证，因此代表了将全PSC朝工业化生产以及进一步发展的一种有前途的方法商业化。