An investigation of the role acceptor side chains play in the processibility and efficiency of organic solar cells fabricated from small molecular donors featuring 3,4-ethylenedioxythiophene cores.
An investigation of the role acceptor side chains play in the processibility and efficiency of organic solar cells fabricated from small molecular donors featuring 3,4-ethylenedioxythiophene cores.
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DOI：
10.1039/c8ra07034b
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发表时间：
2018-11-23
期刊：
影响因子：
3.9
通讯作者：
Samuel, I. D. W.
中科院分区：
文献类型：
--
作者：
Mica, N. A.;Almahmoud, S. A. J.;Jagadamma, L. Krishnan;Cooke, G.;Samuel, I. D. W.
由小分子供体制造的有机光伏器件由于其所需的性质如方便的合成、纯化和批次间的再现性而继续受到极大的关注。在这项研究中，我们已经合成了两个小分子的基础上交替A-D-A结构，利用中央EDOT供体部分和2-乙基己基氰基乙酸酯（SAM-72）或N-（2-乙基己基）氰基乙酰胺（SAM-80）作为受体末端单元。用PC 71 BM将小分子掺入到体异质结太阳能电池中。我们的研究表明，用于SAM-80的侧链仅允许使用挥发性溶剂如氯仿的溶液加工，这限制了器件制造的再现性。然而，SAM-72显示出更好的溶解性，并且使用SAM-72：PC 71 BM有源层制造的器件达到1.9%的平均功率转换效率，填充因子达到60%。后处理方法，如热退火和溶剂蒸气退火，被发现显着提高器件的稳定性，但不能提高整体器件性能。受体侧链的化学性质在基于EDOT的小分子供体的加工性和光伏性能中起重要作用。
Organic photovoltaic devices fabricated from small molecular donors continue to receive significant interest due to their desirable properties such as convenient synthesis, purification and batch-to-batch reproducibility. In this study, we have synthesized two small molecules based on an alternating A–D–A structure, utilizing a central EDOT donor moiety and either 2-ethylhexyl cyanoacetate (SAM-72) or N-(2-ethylhexyl)cyanoacetamide (SAM-80) units as acceptor termini. The small molecules were incorporated into bulk heterojunction solar cells with PC71BM. Our investigations have shown that the side chains utilized for SAM-80 only allow for solution processing using volatile solvents, such as chloroform, which limits the reproducibility of device fabrication. However, SAM-72 displays better solubility and devices fabricated using a SAM-72:PC71BM active layer reached average power conversion efficiencies of 1.9%, with fill factors reaching 60%. Post-processing methods such as thermal and solvent vapor annealing were found to significantly increase the stability of devices, but were not able to improve overall device performance. The chemical nature of the acceptor side chain plays an important role in the processability and photovoltaic performance of EDOT-based small molecule donors.
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