Self-assembled monolayers as interfaces for organic opto-electronic devices
Self-assembled monolayers as interfaces for organic opto-electronic devices
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自组装单分子层作为有机光电器件的界面
DOI：
10.1007/s100510050962
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
M. Grätzel
中科院分区：
文献类型：
--
作者：
L. Zuppiroli;L. Si;K. Kamarás;F. Nüesch;M. Bussac;D. Adès;A. Siove;E. Moons;M. Grätzel
通过使用接枝在电极上的功能化分子的自组装单层，可以改善向有机半导体中的电荷注入。可以设计这种新的界面以降低导电电极和有机半导体之间的肖特基势垒。也可以选择所涉及的分子的极化率，以增加分子半导体在电极上的粘附力。我们介绍了在许多此类衍生电极上进行的开尔文探针实验和饱和光电压测量。它们允许定量描述由于自组装单分子膜的电位偏移，这些自组装单分子膜与构成它们的单个分子的电偶极子有关。当对有机半导体的带态有贡献的共轭位点在像力电势的负部分中被放置得太靠近电极时，会出现两个不利于电荷注入的新效应。我们证明，它是方便的，以减少这些不良影响，从共轭核心的非共轭位点的间隔区的分子的连接基团。
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 polarizability 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.