Infrared study of the MoO3 doping efficiency in 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP)
Infrared study of the MoO3 doping efficiency in 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP)
复制标题
DOI：
10.1016/j.orgel.2012.11.031
复制
发表时间：
2013-02-01
影响因子：
3.2
通讯作者：
Pucci, Annemarie
中科院分区：
文献类型：
--
作者：
Glaser, Tobias;Beck, Sebastian;Pucci, Annemarie
电化学掺杂对有机半导体的振动光谱产生了明显的变化，如图所示，在电荷输运材料4,4'-双（n -咔唑基）-1,1'-联苯（CBP）中掺杂了氧化钼（MoO3）。基于振动谱的密度泛函理论（DFT）计算，新的光谱特征可归因于电子从CBP转移到MoO3而形成的CBP阳离子。新振动线的强度是电荷转移概率的直接度量。MoO3在CBP基体内的聚集限制了两种物质之间的活性界面面积。在红外范围内广泛的电子跃迁的出现表明与单个组件相比，界面处有新的电子结构。这种电子激发的强度作为界面面积的度量，表明MoO3浓度线性增加。沉积在冷却的基板上可以产生更小的团块，从而产生更高的效率。(C) 2012 Elsevier B.V.版权所有
Electrochemical doping produces clear changes in the vibrational spectra of organic semiconductors as we show here for the system molybdenum oxide (MoO3) doped into the charge transport material 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP). Based on density-functional theory (DFT) calculations of vibrational spectra, the new spectral features can be attributed to the CBP cation that forms as a result of electron transfer from CBP to MoO3. The intensity of the new vibrational lines is a direct measure for the probability of charge transfer. MoO3 agglomerating within the CBP matrix limits the active interface area between the two species. The appearance of a broad electronic transition in the infrared range indicates a new electronic structure at the interface compared to the individual components. The intensity of this electronic excitation serves as a measure for the interface area indicating a linear increase with MoO3 concentration. Deposition onto cooled substrates results in smaller agglomerates, and thus yields a higher efficiency. (C) 2012 Elsevier B.V. All rights reserved.