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首页> 外文期刊>The European physical journal, B. Condensed matter physics >Self-assembled monolayers as interfaces for organic opto-electronic devices
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Self-assembled monolayers as interfaces for organic opto-electronic devices

机译：自组装单分子层作为有机光电器件的界面

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Charge injection into an organic semiconductor can be improved by using a self-assembled monolayer of functionalized molecules grafted on the electrode. This new interface can be designed in order to reduce the Schottky barrier between the conductive electrode and the organic semiconductor. The polar-izability of the molecules involved can also be chosen in order to increase the adhesion of the molecular semiconductor onto the electrode. We present Kelvin Probe experiments and saturated photovoltage measurements performed on a number of such derivatized electrodes. They permit a quantitative description of the potential shifts due to the self-assembled monolayers which are related to the electrical dipoles of the individual molecules constituting them. When conjugated sites contributing to the band states of the organic semiconductor are placed too close to the electrode in the negative part of the image-force potential, two new effects unfavorable to charge injection can appear. We demonstrate that it is convenient to separate the attachment group of the molecule from the conjugated core by a spacer of non-conjugated sites in order to reduce these undesirable effects.
机译：通过使用嫁接在电极上的功能化分子的自组装单分子层，可以改善向有机半导体中的电荷注入。可以设计这个新的界面，以减少导电电极和有机半导体之间的肖特基势垒。为了增加分子半导体在电极上的附着力，还可以选择所涉及分子的极化率。我们介绍了在许多这种衍生电极上进行的开尔文探针实验和饱和光电压测量。它们允许对由于自组装单分子层引起的电势位移进行定量描述，这些分子与构成它们的单个分子的电偶极子有关。当在图像力电位的负部分中将有助于有机半导体的能带状态的共轭位点太靠近电极时，会出现两个不利于电荷注入的新效应。我们证明了方便的是通过非共轭位点的间隔基将分子的连接基团与共轭核心分开，以减少这些不良影响。

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