USE OF SPACE-CHARGE-LIMITED CURRENT TO EVALUATE THE ELECTRONIC DENSITY-OF-STATES IN DIAMOND-LIKE CARBON THIN-FILMS

Authors
SILVA SRP AMARATUNGA GAJ
Citation
Srp. Silva et Gaj. Amaratunga, USE OF SPACE-CHARGE-LIMITED CURRENT TO EVALUATE THE ELECTRONIC DENSITY-OF-STATES IN DIAMOND-LIKE CARBON THIN-FILMS, Thin solid films, 253(1-2), 1994, pp. 146-150
Citations number
14
Categorie Soggetti
Physics, Applied","Material Science","Physics, Condensed Matter
Journal title
Thin solid films → ACNP
ISSN journal
00406090
Volume
253
Issue
1-2
Year of publication
1994
Pages
146 - 150
Database
ISI
SICI code
0040-6090(1994)253:1-2<146:UOSCTE>2.0.ZU;2-H
Abstract
Diamond-like carbon thin films are characterized using the space-charg e limited current (SCLC) under electron and hole injection. An electro nic density of states diagram derived using SCLC shows similarities to the Davies-Mott model, with localized states within the midgap region and band tailing at the edges of the gap. The density of midgap state s for diamond-like carbon is of the order of 10(18) cm(-3) eV(-1) and increases to 10(21) cm(-3) eV(-1) at the localized states associated w ith the pi-pi bands. Activation energy and SCLC analysis show a defec t state density of the order of 10(19) cm(-3) eV(-1) close to the cent re of the band gap.