Charge-carrier transport in disordered organic solids

被引:144
作者
Baranovskii, SD [1 ]
Cordes, H
Hensel, F
Leising, G
机构
[1] Univ Marburg, Inst Chem Phys, D-35032 Marburg, Germany
[2] Univ Marburg, Zentrum Mat Wissensch, D-35032 Marburg, Germany
[3] Joanneum Res Forsch Gesel MBH, Inst Nanostrukturierte Mat & Photon, A-8160 Weiz, Austria
关键词
D O I
10.1103/PhysRevB.62.7934
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
An analytic theoretical description of transport processes based on the concept of transport energy is suggested for disordered organic solids. It gives not only the natural explanation of experimental data but also accounts for the results of computer simulations considered so far puzzling. In particular, this approach accounts for the strong difference between the temperature dependence of the carrier drift mobility and that of the relaxation time. Experimental data for the low-field drift mobility display the temperature dependence in the form mu proportional to exp{-(T-0/T)(2)}. It is believed that the characteristic temperature T-0 is determined solely by the scale of the energy distribution of localized states, and such a temperature dependence of mu is widely used to determine this energy scale from experimental data for various materials. We show that this temperature dependence is not universal and that parameter T-0 depends also on the concentration of localized states and on the decay length of the carrier wave function in the localized states. The suggested theory provides a general basis for the treatment of transport processes in disordered organic media.
引用
收藏
页码:7934 / 7938
页数:5
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