(Invited) Spectroscopy of Deep Gap States in High-k Insulators

Autor:	Florin Cerbu, Oreste Madia, Wan Chih Wang, Andre Stesmans, Valery V. Afanas'ev, Michel Houssa
Rok vydání:	2014
Předmět:	Materials science Condensed matter physics Spectroscopy High-κ dielectric
Zdroj:	ECS Transactions. 64:17-22
ISSN:	1938-6737 1938-5862
DOI:	10.1149/06408.0017ecst
Popis:	The work describes the physical principles of the exhaustive photodepopulation spectroscopy. This method allows one to determine the energy distribution of gap states in insulating materials using the observation of optically-assisted electron removal from the gap states in incremental spectral windows. Examples of the inferred energy distributions of acceptor-type electron states in several high-k oxide insulators (Al2O3, HfO2, GdxAl2-xO3) indicate that these are »1-2 eV broad. At the same time, no detectable density of donor states, expected to be present due to oxygen vacancies, is found in the studied oxides.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::27de6f86ed310f642be45e2bd1a480a0 https://doi.org/10.1149/06408.0017ecst Zobrazit plný text záznamu