微观电荷动态的比较研究在晶体接受器替代的寡甲基中
Manuel Schrader1, Roland Fitzner, Moritz Hein
1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Journal of the American Chemical Society
|March 17, 2012
概括
显微镜模拟显示,具有接受器-捐赠器-接受器结构的晶体有机半导体由于分子灵活性和二极体而表现出显著的能量障碍和不寻常的电荷传输行为. 这种障碍妨碍了有效的电荷传输,这与对晶体材料的预期相反.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 计算化学计算化学
背景情况:
- 有机半导体对于电子设备至关重要.
- 了解晶体有机材料中的电荷传输是设备优化的关键.
- 具有接受者-捐赠者-接受者 (ADA) 结构的基是有机电子学的有希望的候选者.
研究的目的:
- 为了研究结晶的dcyanovinyl-substituted oligothiophenes中的电荷传输机制.
- 阐明分子结构,热波动和静态二极体对电荷传输特性的影响.
- 识别影响这些材料能量混乱和电荷捕获的因素.
主要方法:
- 使用了微观电荷传输模拟.
- 分析局部电场,能量障碍和普尔-弗伦克尔行为.
- 研究二面角波动和分子极化性的作用.
- 对电荷运输路径上的π堆积效应的评估.
主要成果:
- ADA分子结构和热波动诱导显著的能量障碍和普尔-弗伦克尔行为,在晶体系统中是意想不到的.
- 静态分子二极体有助于能量障碍,而这种障碍是由分子极化而不是二极体补偿所缓解的.
- 具有强合的 π 堆积方向占主导地位,阻碍了替代运输路径,并促进了电荷的捕获.
结论:
- 在晶体有机半导体中,分子设计和动态效应的相互作用导致复杂的电荷传输现象.
- 分子极化对于减少静态二极体材料中的能量混乱至关重要.
- 优化电荷传输需要仔细考虑π堆叠和潜在的电荷捕获地点.
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