Meyer–Neldel rule in the space‐charge‐limited conduction of hydrogenated amorphous silicon
作者:
G. Oversluizen,
K. J. B. M. Nieuwesteeg,
J. Boogaard,
期刊:
Applied Physics Letters
(AIP Available online 1991)
卷期:
Volume 59,
issue 3
页码: 312-314
ISSN:0003-6951
年代: 1991
DOI:10.1063/1.105581
出版商: AIP
数据来源: AIP
摘要:
The conductivity of a hydrogenated amorphous siliconn+‐intrinsic‐n+(n‐i‐n) structure is reported as a function of temperature. The space‐charge‐limited conductivity &sgr; is shown to follow the Meyer–Neldel rule (MNR) [W. Meyer and H. Neldel, Z. Tech. Phys.18, 588 (1937)]: &sgr; =&sgr;00 exp(Ea/kT0) exp(−Ea/kT), whereEais the conductivity activation energy,kis Boltzmann’s constant, andTis the absolute temperature. The characteristic MNR parameters found are &sgr;00=10−2.4±0.1(&OHgr; cm)−1andT0=590±10 K. These values are practically equal to those previously found for the MNR in the ohmic conductivity in a series of hydrogenated amorphous siliconn‐i‐nstructures with varyingi‐layer thicknesses. It is argued that the MNR can be quantitatively explained by the statistical shift of the Fermi energy and that a single set of parameters corresponding to &sgr;00=10−3±1(&OHgr; cm)−1andT0=550±100 K is applicable for both the space‐charge limited and the ohmic conductivity ofi‐type hydrogenated amorphous silicon. The MNR parameters are rather insensitive to density of states details.
点击下载:
PDF
(290KB)
返 回