{"id":261,"date":"2024-10-29T16:55:19","date_gmt":"2024-10-29T15:55:19","guid":{"rendered":"http:\/\/wwww.icp.universite-paris-saclay.fr\/temic\/?page_id=261"},"modified":"2024-10-29T17:06:46","modified_gmt":"2024-10-29T16:06:46","slug":"trmc","status":"publish","type":"page","link":"https:\/\/www.icp.universite-paris-saclay.fr\/temic\/en\/outstanding-instruments\/trmc\/","title":{"rendered":"TRMC"},"content":{"rendered":"

TRMC<\/h3>\n
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La conductivit\u00e9 micro-onde r\u00e9solue en temps (TRMC: Time-Resolved Microwave Conductivity) permet d\u2019\u00e9tudier la dur\u00e9e de vie de porteurs de charge, \u00e9lectrons et protons, des \u00e9chantillons solides, de l\u2019\u00e9chelle nanoseconde \u00e0 la microseconde gr\u00e2ce au changement de la photoconductivit\u00e9 de l'\u00e9chantillon induit par un laser puls\u00e9<\/p>\n<\/div>\n<\/div><\/div>

Principles of TRMC<\/h3>\n
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Upon pulsed laser irradiation of the sample, free excess charge carriers, i.e. electrons and holes, are created. Free excess charge carriers induce a relative change of reflected microwave power (\u0394P(t)\/P<\/em>). Irradiation of sample by laser induces sample conductivity perturbation \u03c3(t), which directly influences the relative change of initial reflected microwave power. The relation between conductivity and microwave absorption is given by the following expression:<\/p>\n

\u0394P(t)\/P<\/em>\u00a0=\u00a0A<\/em>\u00a0\u0394\u03c3(t) =\u00a0A<\/em>\u00a0e<\/em>\u00a0\u03a3i<\/sub>\u00a0\u0394ni<\/sub>(t)<\/em>\u00a0\u03bci<\/sub><\/em><\/p>\n

where\u00a0\u0394ni<\/sub>\u00a0 corresponds to the number of excess charge carriers i at time t,\u00a0\u03bci<\/sub>\u00a0to the mobility of charge carriers, and A to the time-independent sensitivity factor.<\/em><\/p>\n

The TRMC signal is described by two parameters: the maximum value Imax<\/sub> and the time decay I(t)<\/em>. The maximum signal intensity determines the density of excess free charge carriers created during irradiation, while the decay I(t)\u00a0<\/em>corresponds to the trapping, recombination of charge carriers, or electron\/proton transfer over time ttt, spanning from the nanosecond to the microsecond timescale.<\/p>\n<\/div>\n<\/div><\/div>

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TRMC signals obtained at (a) 360 nm (a) and (b) 420 nm laser excitation [Xu2022<\/a>]<\/em><\/p>\n<\/div>\n<\/div><\/div>

Characteristics<\/h3>\n
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Laser source<\/strong>: OPO pulsed laser (EKSPLA, NT342B) tunable from 225 to 2000 nm. It delivers 8 ns FWMH pulses at a repetition rate of 10\u2005Hz.<\/p>\n

Microwave source<\/strong>: The incident microwaves are generated by a Gunn diode of the K\u03b1 band at 30 GHz.<\/p>\n

Sample<\/strong>: solid<\/p>\n<\/div>\n<\/div><\/div>

Scientific supervisor <\/h3>\n
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Prof Christophe Colbeau-Justin<\/p>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

La conductivit\u00e9 micro-onde r\u00e9solue en temps (TRMC: Time-Resolved Microwave Conductivity) permet d\u2019\u00e9tudier la dur\u00e9e de vie de porteurs de charge, \u00e9lectrons et protons, des \u00e9chantillons solides, de l\u2019\u00e9chelle nanoseconde \u00e0 la microseconde gr\u00e2ce au changement de la photoconductivit\u00e9 de l’\u00e9chantillon induit par un laser puls\u00e9 Upon pulsed laser irradiation of the sample, free excess charge… Lire la suite »TRMC<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":255,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":100,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"class_list":["post-261","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.icp.universite-paris-saclay.fr\/temic\/wp-json\/wp\/v2\/pages\/261","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.icp.universite-paris-saclay.fr\/temic\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.icp.universite-paris-saclay.fr\/temic\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.icp.universite-paris-saclay.fr\/temic\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.icp.universite-paris-saclay.fr\/temic\/wp-json\/wp\/v2\/comments?post=261"}],"version-history":[{"count":5,"href":"https:\/\/www.icp.universite-paris-saclay.fr\/temic\/wp-json\/wp\/v2\/pages\/261\/revisions"}],"predecessor-version":[{"id":266,"href":"https:\/\/www.icp.universite-paris-saclay.fr\/temic\/wp-json\/wp\/v2\/pages\/261\/revisions\/266"}],"up":[{"embeddable":true,"href":"https:\/\/www.icp.universite-paris-saclay.fr\/temic\/wp-json\/wp\/v2\/pages\/255"}],"wp:attachment":[{"href":"https:\/\/www.icp.universite-paris-saclay.fr\/temic\/wp-json\/wp\/v2\/media?parent=261"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}