Department of Applied Chemistry , National Chi Nan University , Puli 54561 , Taiwan.
Department of Fiber and Composite Materials , Feng Chia University , Taichung 40724 , Taiwan.
ACS Appl Mater Interfaces. 2019 Dec 11;11(49):45991-45998. doi: 10.1021/acsami.9b15975. Epub 2019 Nov 20.
A series of tailor-made highly efficient and near-infrared (NIR) porphyrin-based acceptors is designed and synthesized for fullerene-free bulk-heterojunction (BHJ) organic solar cells. Constructing BHJ active layers using a PTB7-Th donor and porphyrin acceptors (P-), which have complementary absorption, accomplishes panchromatic photon-to-current conversion from 300 to 950 nm. Our study shows that side chains of the porphyrin acceptors fairly influence the molecular ordering and nanomorphology of the BHJ active layers. Significantly, the porphyrin acceptor with four dodecoxyl side chains (P-2) achieves an open-circuit voltage () of 0.80 V, short-circuit current density () of 13.94 mA cm, fill factor of 64.8%, and overall power conversion efficiency of 7.23%. This great performance is attributable to the ascendant light-harvesting capability in the visible and near-infrared region, a high-lying LUMO energy level, a relatively high and more balanced carrier mobilities, and more ordered face-on molecular packing, which is beneficial for obtaining high and .
一系列定制的高效近红外（NIR）基于卟啉的受体被设计和合成，用于富勒烯免费的体异质结（BHJ）有机太阳能电池。使用 PTB7-Th 给体和卟啉受体（P-）构建 BHJ 活性层，它们具有互补的吸收，实现了从 300nm 到 950nm 的全色光子到电流的转换。我们的研究表明，卟啉受体的侧链对 BHJ 活性层的分子有序性和纳米形貌有很大的影响。值得注意的是，具有四个十二烷氧基侧链的卟啉受体（P-2）实现了开路电压（）为 0.80V，短路电流密度（）为 13.94mAcm，填充因子为 64.8%，整体功率转换效率为 7.23%。这种优异的性能归因于在可见光和近红外区域上升的光收集能力，较高的 LUMO 能级，较高且更平衡的载流子迁移率，以及更有序的面向上分子堆积，这有利于获得高和。
