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Photoconductivity of lightly-doped and semi-insulating 4H-SiC and the free exciton binding energy
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials.
2002 (English)In: Materials Science Forum, Vols. 389-393, 2002, Vol. 389-3, 613-616 p.Conference paper, Published paper (Refereed)
Abstract [en]

The paper presents a study of the structure of the photoconductivity spectra of various 4H-SiC samples near the absorption edge. By means of comparison of the spectra of low doped (mid 10(14) cm(-3)), very low doped (in 10(13) cm(-3) range), and semi-insulating moderately doped samples, features in the photocurrent due to contribution from creation of free carriers (i.e., excitons in the continuum) can be recognised. This is used for determination of the free exciton binding energy, 20.5 +/- 1 meV, in agreement with a previous study. The second lowest conduction band and the spin-orbit split off valence band are also detected.

Place, publisher, year, edition, pages
2002. Vol. 389-3, 613-616 p.
Keyword [en]
electronic band-gap, exciton binding energy, excitonic band-gap, extrinsic photocurrent, intrinsic photocurrent
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-48819OAI: oai:DiVA.org:liu-48819DiVA: diva2:269715
Conference
ICSCRM2001
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2010-12-07

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Ivanov, Ivan GueorguievStorasta, LiutaurasJanzén, Erik

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