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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Fullerene-free organic photovoltaics based on unconventional material combination: a molecular donor and polymeric acceptors
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Fullerene-free organic photovoltaics based on unconventional material combination: a molecular donor and polymeric acceptors

机译：基于非常规材料组合的不含富勒烯的有机光伏产品：分子供体和聚合物受体

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摘要

In conventional organic photovoltaic cells, the active layer consists of a polymeric donor and a molecular acceptor (P-D/M-A). An unconventional material combination based on molecular donor/polymeric acceptor (M-D/P-A) emerged in 2014 but attracted limited attention. To broaden photovoltaic material systems and understand the crucial factors related to the photovoltaic performance, in this report, we adopted a molecular donor (p-DTS(FBTTh2)(2)) and three polymeric acceptors based on perylenediimide (PDI). We find that the high contents (70-80%) of p-DTS(FBTTh2)(2) and the better crystallinity and larger grains in the blend films induced by the addition of 1,8-diiodooctane (DIO) play an important role in constructing the continuous and effective donor phase for charge transfer and hole transport in the active layers. The highest PCE of photovoltaic cells reached 3.01% with a V-OC of 0.68 V, J(SC) of 7.59 mA cm(-2), and FF of 0.58 for the p-DTS(FBTTh2)(2) : PSe-PDI active layer, although the hole and the electron mobilities are still unbalanced. Further optimization of the film morphology and improvement of the electron mobility by material design and device engineering are expected to boost the efficiency of M-D/P-A type fullerene-free solar cells.
机译：在常规的有机光伏电池中，活性层由聚合物供体和分子受体（P-D / M-A）组成。 2014年出现了一种基于分子供体/聚合物受体（M-D / P-A）的非常规材料组合，但受到的关注有限。为了拓宽光伏材料系统并了解与光伏性能相关的关键因素，在本报告中，我们采用了分子供体（p-DTS（FBTTh2）（2））和三种基于ylene二酰亚胺（PDI）的聚合物受体。我们发现，高含量（70-80％）的p-DTS（FBTTh2）（2）以及由添加1,8-二碘辛烷（DIO）引起的共混膜中更好的结晶度和更大的晶粒起着重要作用在构造连续且有效的供体相以在有源层中进行电荷转移和空穴传输的过程。 p-DTS（FBTTh2）（2）的光伏电池最高PCE达到3.01％，V-OC为0.68 V，J（SC）为7.59 mA cm（-2），FF为0.58：PSe-PDI有源层，尽管空穴和电子迁移率仍然不平衡。预期通过材料设计和装置工程来进一步优化膜形态并改善电子迁移率将提高M-D / P-A型无富勒烯太阳能电池的效率。

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