Increasing Electrode Work Function Using a Natural Molecule
Increasing Electrode Work Function Using a Natural Molecule
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DOI：
10.1002/admi.202201800
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发表时间：
2022-12-02
影响因子：
5.4
通讯作者：
Yamada, Yoichi
中科院分区：
文献类型：
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作者：
Akaike, Kouki;Hosokai, Takuya;Yamada, Yoichi
为有机电子产品提供可持续性是非常必要的，以减少有机设备在处置时对环境和人类健康的负面影响。为了获得电子器件的生物降解性和生物相容性，利用天然分子作为器件成分是必不可少的。在这项研究中，据报道，咖啡酸（CfA），植物生物合成的极性苯丙素，吸附普遍增加实用电极和有机膜的功函数（WFs）。在电极材料上真空沉积或旋转浇铸CfA膜形成偶极层，其中羧基上的负电荷暴露于最外表面。CfA的邻苯二酚部分到基板表面上的优先吸附驱动分子取向，导致WF增加到0.7 eV。因此，具有CfA中间层的单层器件在正向偏压下促进空穴注入10（1）-10（2）倍，这验证了天然分子用于有机电子学的可用性。
Providing sustainability to organic electronics is highly demanded to reduce the negative impact of organic devices on environments and human health upon their disposal. To attain biodegradability and biocompatibility of the electronic devices, utilization of the natural molecules for the device constituents is essential. In this study, it is reported that the adsorption of caffeic acid (CfA), a polar phenylpropanoid that plants bio-synthesize, universally increases work functions (WFs) of practical electrodes and organic films. Either vacuum-depositing or spin-casting CfA films on the electrode materials form a dipole layer with the negative charges on the carboxyl group exposed to the outermost surface. The preferential adsorption of the catechol moiety of CfA onto substrate surfaces drives the molecular orientation, leading to the WF increase up to 0.7 eV. As a consequence, the single-layer devices with the CfA interlayer facilitate the hole injection in forward bias by a factor of 10(1)-10(2), which validates the usability of the natural molecule for organic electronics.