Traps and trions as origin of magnetoresistance in organic semiconductors

被引：49

作者：

Cox, M. ^{[1
]}

Janssen, P.

Zhu, F.

Koopmans, B.

机构：

[1] Eindhoven Univ Technol, Ctr NanoMat, Dept Appl Phys, NL-5600 MB Eindhoven, Netherlands

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 03期

关键词：

CONJUGATED POLYMERS; ROOM-TEMPERATURE; TRANSPORT; DEVICES; EXCITONS; FILMS;

D O I：

10.1103/PhysRevB.88.035202

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The large effect of a small magnetic field on the current, magnetoconductance (MC), in organic semiconductors-so-called organic magnetoresistance-has puzzled the field of organic spintronics during the last decade. Although the microscopic mechanisms regarding spin mixing are well understood by now, it is still unknown which pairs of spin carrying particles are influencing the current in such a drastic manner. Here, a model for the MC is presented based on the spin selective formation of metastable trions from triplet exciton-polaron pairs. Additionally, the magnetic-field and voltage dependence of the MC are experimentally investigated in materials showing large effects. Using a combination of analytical and numerical calculations, it is shown that the MC is perfectly described by a process in which trions are created at polaron trap sites.

引用

页数：7

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