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首页> 外文期刊>Advanced energy materials >Donor-Acceptor-Acceptor’s Molecules for Vacuum-Deposited Organic Photovoltaics with Efficiency Exceeding 9%
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Donor-Acceptor-Acceptor’s Molecules for Vacuum-Deposited Organic Photovoltaics with Efficiency Exceeding 9%

机译：供体-受体-受体分子，用于真空沉积有机光伏，效率超过9％

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摘要

Three vacuum-deposited donor-acceptor-acceptor (d-a-a') small molecule donors are studied with different side chains attached to an asymmetric heterotetracene donor block for use in high efficiency organic photovoltaics (OPVs). The donor with an isobutyl side chain yields the highest crystal packing density compared to molecules with 2-ethylhexyl or n-butyl chains, leading to the largest absorption coefficient and short circuit current in an OPV. It also exhibits a higher fill factor, consistent with its preferred out-of-plane molecular pi-pi stacking arrangement that facilitates charge transport in the direction perpendicular to the substrate. A power conversion efficiency of 9.3 +/- 0.5% is achieved under 1 sun intensity, AM 1.5 G simulated solar illumination, which is significantly higher than 7.5 +/- 0.4% of the other two molecules. These results indicate that side chain modification of d-a-a' small molecules offers an effective approach to control the crystal packing configuration, thereby improving the device performance.
机译：研究了三个真空沉积的供体-受体-受体（d-a-a'）小分子供体，它们的不同侧链连接到不对称异丁烯供体嵌段上，用于高效有机光伏（OPV）。与具有2-乙基己基或正丁基链的分子相比，具有异丁基侧链的供体产生最高的晶体堆积密度，从而在OPV中产生最大的吸收系数和短路电流。它也表现出更高的填充因子，与其优选的平面外分子pi-pi堆叠结构相一致，这有利于电荷在垂直于基板的方向上传输。在1个太阳强度，AM 1.5 G模拟太阳光照下，功率转换效率达到9.3 +/- 0.5％，远高于其他两个分子的7.5 +/- 0.4％。这些结果表明，d-a-a'小分子的侧链修饰提供了控制晶体堆积结构的有效方法，从而改善了器件性能。

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