The kinetics of the R- and UV-band photoconductivity (PC) in radiation damaged diamond
Identifieur interne : 003E28 ( Main/Exploration ); précédent : 003E27; suivant : 003E29The kinetics of the R- and UV-band photoconductivity (PC) in radiation damaged diamond
Auteurs : L. A. Vermeulen [Afrique du Sud] ; A. Halperin [Afrique du Sud]Source :
- Journal of Physics and Chemistry of Solids [ 0022-3697 ] ; 1984.
Abstract
Illumination in the UV-band of radiation damaged diamond was found to enhance the PC in the red (the RPC). Continuous R-illumination then caused the RPC to decay hyperbolically to zero. R-band illumination also enhanced the PC in the UV band (UPC). Continuous illumination in the UV-band then caused the UPC to decay to a level about half of the maximum UPC. A two-level model was proposed in which exchange of holes between the U- and R-levels via the valence band was assumed to take place under illumination. The differential equations obtained from the kinetics of the transitions were solved with some approximations, and were found to give an excellent agreement with the experimental results. Further support for the model was obtained from numerical integration of the differential equations. When compared with the experimental results this provided information on the crystal parameters involved. The transition rates for valence-band holes into the levels R and U were found to be: AR= UU = 2.3 × 10−11 m3sec−1, which gave for the capture-cross-sections at 290 K of these centres S = 3.2 × 10−17m2. Surprisingly low densities of the order of 1012m−3 were obtained for R and U, indicating that only a small fraction of the damage-produced defects play a role in the UPC and RPC.
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DOI: 10.1016/0022-3697(84)90074-X
Affiliations:
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A." last="Vermeulen">L. A. Vermeulen</name><affiliation wicri:level="4"><country xml:lang="fr">Afrique du Sud</country><wicri:regionArea>Solid State Physics Research Unit and Department of Physics, University of the Witwatersrand, Johannesburg</wicri:regionArea><orgName type="university">Université du Witwatersrand</orgName><placeName><settlement type="city">Johannesburg</settlement><region type="region" nuts="2">Gauteng</region></placeName></affiliation></author><author><name sortKey="Halperin, A" sort="Halperin, A" uniqKey="Halperin A" first="A." last="Halperin">A. Halperin</name><affiliation wicri:level="4"><country xml:lang="fr">Afrique du Sud</country><wicri:regionArea>Solid State Physics Research Unit and Department of Physics, University of the Witwatersrand, Johannesburg</wicri:regionArea><orgName type="university">Université du Witwatersrand</orgName><placeName><settlement type="city">Johannesburg</settlement><region type="region" nuts="2">Gauteng</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Physics and Chemistry of Solids</title><title level="j" type="abbrev">PCS</title><idno type="ISSN">0022-3697</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1984">1984</date><biblScope unit="volume">45</biblScope><biblScope unit="issue">7</biblScope><biblScope unit="page" from="771">771</biblScope><biblScope unit="page" to="779">779</biblScope></imprint><idno type="ISSN">0022-3697</idno></series><idno type="istex">96B15948FB73BA044EBCDC00DC9FDCB599BB2624</idno><idno type="DOI">10.1016/0022-3697(84)90074-X</idno><idno type="PII">0022-3697(84)90074-X</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-3697</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Illumination in the UV-band of radiation damaged diamond was found to enhance the PC in the red (the RPC). Continuous R-illumination then caused the RPC to decay hyperbolically to zero. R-band illumination also enhanced the PC in the UV band (UPC). Continuous illumination in the UV-band then caused the UPC to decay to a level about half of the maximum UPC. A two-level model was proposed in which exchange of holes between the U- and R-levels via the valence band was assumed to take place under illumination. The differential equations obtained from the kinetics of the transitions were solved with some approximations, and were found to give an excellent agreement with the experimental results. Further support for the model was obtained from numerical integration of the differential equations. When compared with the experimental results this provided information on the crystal parameters involved. The transition rates for valence-band holes into the levels R and U were found to be: AR= UU = 2.3 × 10−11 m3sec−1, which gave for the capture-cross-sections at 290 K of these centres S = 3.2 × 10−17m2. Surprisingly low densities of the order of 1012m−3 were obtained for R and U, indicating that only a small fraction of the damage-produced defects play a role in the UPC and RPC.</div></front></TEI><affiliations><list><country><li>Afrique du Sud</li></country><region><li>Gauteng</li></region><settlement><li>Johannesburg</li></settlement><orgName><li>Université du Witwatersrand</li></orgName></list><tree><country name="Afrique du Sud"><region name="Gauteng"><name sortKey="Vermeulen, L A" sort="Vermeulen, L A" uniqKey="Vermeulen L" first="L. A." last="Vermeulen">L. A. Vermeulen</name></region><name sortKey="Halperin, A" sort="Halperin, A" uniqKey="Halperin A" first="A." last="Halperin">A. Halperin</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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