A p-π* conjugated triarylborane as an alcohol-processable n-type semiconductor for organic optoelectronic devices
A p-π* conjugated triarylborane as an alcohol-processable n-type semiconductor for organic optoelectronic devices
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p-pi 共轭三芳基硼烷作为有机光电器件中可醇加工的 n 型半导体
DOI：
10.1039/c9tc01562k
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发表时间：
2019-06-28
影响因子：
6.4
通讯作者：
Wang, Lixiang
中科院分区：
文献类型：
--
作者：
Yu, Yingjian;Dong, Changshuai;Wang, Lixiang
我们报道了一种基于三芳基硼烷的p-pi*共轭有机分子，作为具有独特的醇溶解性的n型有机半导体。其良好的醇溶性能，即使在没有极性侧链的情况下，主要是由于硼原子嵌入后共轭主链的大偶极矩和增强的灵活性。P-pi*共轭直接影响电子结构，因为LUMO是完全离域的，包括B原子，而HOMO具有驻留在节点上的B原子。结果表明，该分子的LUMO/HOMO能级为-3.61 eV/-5.73 eV，电子迁移率为1.37×10(-5)cm(2)V-1 S(-1)。我们进一步展示了它作为电子受体在酒精处理的有机太阳能电池(OSCs)中的应用。据我们所知，这种p-pi*共轭分子是第一个可酒精处理的非富勒烯电子受体，这是对OSCs进行环境友好处理的强烈需求。
We report a p-pi* conjugated organic molecule based on triarylborane as n-type organic semiconductor with unique alcohol solubility. Its favorable alcohol solubility even in the absence of polar side chains is mainly due to the large dipole moment and enhanced flexibility of the conjugated backbone once the boron atom is embedded. The p-pi* conjugation directly affects the electronic structure as the LUMO is fully delocalized, including the boron atom, whereas the HOMO has the boron atom residing on a node. As a result, the molecule exhibits low-lying LUMO/HOMO energy levels of -3.61 eV/-5.73 eV paired with a good electron mobility of 1.37 x 10(-5) cm(2) V-1 s(-1). We further demonstrate its application as an electron acceptor in alcohol-processed organic solar cells (OSCs). To our best knowledge, this p-pi* conjugated molecule is the first alcohol-processable non-fullerene electron acceptor, a feature that is in strong demand for environmentally friendly processing of OSCs.