Possible conduction mechanisms in coconut‐shell activated carbon
作者:
W. M. Daud,
M. Badri,
H. Mansor,
期刊:
Journal of Applied Physics
(AIP Available online 1990)
卷期:
Volume 67,
issue 4
页码: 1915-1917
ISSN:0021-8979
年代: 1990
DOI:10.1063/1.345621
出版商: AIP
数据来源: AIP
摘要:
This work reports on the result of electrical conductivity measurements carried out on coconut‐shell activated carbon. The results suggest that the charge carriers moved by variable‐range hopping below 200 K, by hopping among localized energy states between 200 K and 385 K, and by percolation through energy states close to the mobility edge above 385 K. In the latter two conduction processes, significant additional frequency‐dependent contributions to the conductivity were observed and are tentatively attributed to polarization of unremovable lignin and/or ionic impurities. These explanations are based on the present trends of the electrical transport theory for amorphous semiconductors.
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