Charged Elementary Excitations in Anthracene Polymers. A Systematical Electrical and EPR Study as a Function of Doping
1986; Wiley; Volume: 136; Issue: 1 Linguagem: Inglês
10.1002/pssb.2221360116
ISSN1521-3951
AutoresL. Sh. Grigoryan, I. L. Kharutyunyan, A.A. Matnishyan, R. S. Nikogosyan, E. G. Sharoyan,
Tópico(s)Organic Electronics and Photovoltaics
ResumoAbstract A systematical study of electrical conductivity and EPR of iodine‐doped anthracene polymers (C 14 H 6 I x ) n is carried out within a wide range of iodine concentrations (0.07 ≦ x ≦ 0.85). The room temperature electrical conductivity has a broad maximum near x = 0.5. No metallic‐type conduction is observed. The intensity of EPR signal for all of the investigated samples depends on temperature according to the Curie law and has a minimum near x = 0.19. A clear decoupling of paramagnetism with iodine concentration and electrical conductivity is detected. An idealized model of the structure of (C 14 H 6 I x ) n including polarons and bipolarons is proposed. On the base of the model a mechanism of generation and compensation of spin and charge during the doping process is discussed and an interpretation of experimental data is given.
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