{"id":6093,"date":"2026-10-19T09:48:27","date_gmt":"2026-10-19T09:48:27","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-edlisfraedi-rabia-yasmin-khosa\/"},"modified":"2026-10-19T09:48:27","modified_gmt":"2026-10-19T09:48:27","slug":"doktorsvorn-i-edlisfraedi-rabia-yasmin-khosa","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-edlisfraedi-rabia-yasmin-khosa\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed e\u00f0lisfr\u00e6\u00f0i – Rabia Yasmin Khosa"},"content":{"rendered":"
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Doktorsefni:<\/strong> Rabia Yasmin Khosa<\/p>\n

Heiti ritger\u00f0ar:<\/strong> Rafm\u00e6lingar \u00e1 torlei\u00f0urum til notkunar \u00ed rafsvi\u00f0ssm\u00e1rum ger\u00f0um \u00ed k\u00edsilkarb\u00ed\u00f0i<\/p>\n

Andm\u00e6lendur:<\/strong><\/p>\n

Anders Hall\u00e9n, pr\u00f3fessor vi\u00f0 Konunglega T\u00e6knih\u00e1sk\u00f3lann \u00ed Sv\u00ed\u00fej\u00f3\u00f0.<\/p>\n

Sigur\u00f0ur Ingi Erlingsson, d\u00f3sent vi\u00f0 H\u00e1sk\u00f3lann \u00ed Reykjav\u00edk.<\/p>\n

Lei\u00f0beinandi: <\/strong>Einar \u00d6rn Sveinbj\u00f6rnsson, pr\u00f3fessor vi\u00f0 H\u00e1sk\u00f3la \u00cdslands<\/p>\n

A\u00f0rir \u00ed doktorsnefnd: <\/strong>Hafli\u00f0i P. G\u00edslason, pr\u00f3fessor vi\u00f0 H\u00e1sk\u00f3la \u00cdslands og Dr. Kristj\u00e1n Le\u00f3sson hj\u00e1 N\u00fdsk\u00f6punarmi\u00f0st\u00f6\u00f0 \u00cdslands.<\/p>\n

Doktorsv\u00f6rn st\u00fdrir:<\/strong> Oddur Ing\u00f3lfsson, deildarforseti Raunv\u00edsindadeildar.<\/p>\n

\u00c1grip af ranns\u00f3kn: <\/strong>Aflrafeindat\u00e6knin \u00ed dag byggir a\u00f0 miklu leyti \u00e1 rafsvi\u00f0ssm\u00e1rum (MOSFET) sem ger\u00f0ir eru \u00ed h\u00e1lflei\u00f0aranum k\u00edsli (Si). S\u00fa t\u00e6kni hefur veri\u00f0 bestu\u00f0 undanfarna \u00e1ratugi og n\u00fa er svo komi\u00f0 a\u00f0 \u00fea\u00f0 eru efniseiginleikar k\u00edsilsins sem takmarka straumgetu og spennu\u00feol \u00feessara \u00edhluta. \u00c1 s\u00ed\u00f0ustu \u00e1rum hafa hins vegar komi\u00f0 fram \u00e1 sj\u00f3narsvi\u00f0i\u00f0 n\u00fdjir sm\u00e1rar sem ger\u00f0ir eru \u00ed h\u00e1lflei\u00f0aranum k\u00edsilkarb\u00ed\u00f0i (SiC) sem hafa betri n\u00fdtni en hef\u00f0bundnir k\u00edsilsm\u00e1rar og lei\u00f0a til umtalsver\u00f0s orkusparna\u00f0ar. Fram a\u00f0 \u00feessu er \u00fe\u00f3 einungis unnt a\u00f0 nota SiC sm\u00e1rana vi\u00f0 mj\u00f6g h\u00e1ar spennur (> 900 V). Megni\u00f0 af \u00feeim r\u00e1sum sem nota\u00f0ar eru \u00ed aflrafeindat\u00e6kni vinna hins vegar me\u00f0 spennur \u00e1 bilinu 400-600 V og \u00fear eru SiC sm\u00e1rarnir ekki samkeppnish\u00e6fir. \u00c1st\u00e6\u00f0an er ekki tengd efniseiginleikum k\u00edsilkarb\u00ed\u00f0sins heldur \u00fev\u00ed hvernig samskeyti SiC myndar vi\u00f0 einangrandi efni\u00f0 k\u00edsild\u00edox\u00ed\u00f0 (SiO2) sem nau\u00f0synlegt er til st\u00fdra sm\u00e1ranum. Straumgeta sm\u00e1rans takmarkast af \u00fev\u00ed a\u00f0 veilur \u00e1 SiO2\/SiC samskeytunum hremma rafeindir sem eru \u00e1 lei\u00f0 \u00ed gegnum sm\u00e1rann sem veldur \u00fev\u00ed a\u00f0 straumurinn er um \u00ferefalt l\u00e6gri en b\u00faast m\u00e1 vi\u00f0 ef samskeytin v\u00e6ru gallalaus. Reynt hefur veri\u00f0 a\u00f0 leysa \u00feetta vandam\u00e1l s\u00ed\u00f0ustu 20 \u00e1rin en ekki tekist enn sem komi\u00f0 er. \u00cd \u00feessu ranns\u00f3knarverkefni er markmi\u00f0i\u00f0 a\u00f0 leysa \u00feetta me\u00f0 \u00fev\u00ed a\u00f0 r\u00e6kta a\u00f0ra einangrara: \u00e1ln\u00edtr\u00ed\u00f0 (AlN) e\u00f0a \u00e1lox\u00ed\u00f0 (Al2O3) ofan \u00e1 SiC \u00ed sta\u00f0 SiO2. Ni\u00f0urst\u00f6\u00f0ur \u00feessa verkefnis gefa tilefni til bjarts\u00fdni \u00fear sem fj\u00f6ldi veilna \u00e1 AlN\/SiC og Al2O3\/SiC samskeytunum er mun minni en \u00e1 hef\u00f0bundnum SiO2\/SiC samskeytum. Einnig t\u00f3kst a\u00f0 auka spennu\u00feol \u00feessara samskeyta me\u00f0 \u00fev\u00ed a\u00f0 b\u00e6ta vi\u00f0 einangrandi l\u00f6gum ofan \u00e1 Al2O3 og AlN l\u00f6gin. Hins vegar er \u00fe\u00f6rf \u00e1 a\u00f0 leita lei\u00f0a til a\u00f0 auka spennu\u00feol samskeytanna enn frekar ef \u00feessir einangrarar eiga a\u00f0 geta teki\u00f0 vi\u00f0 hlutverki k\u00edsild\u00edox\u00ed\u00f0s \u00ed aflsm\u00e1rum.<\/p>\n

Um doktorsefni\u00f0: <\/strong>Rabia Yasmin Khosa er f\u00e6dd 1 j\u00fal\u00ed 1988 \u00ed Dera Ghazi Khan \u00ed Pakistan. H\u00fan lauk B.Sc. pr\u00f3fi \u00ed e\u00f0lisfr\u00e6\u00f0i +ari\u00f0 2007 fr\u00e1 B.Z.U Multan University, MS pr\u00f3fi \u00ed t\u00e6knilegri e\u00f0lisfr\u00e6\u00f0i fr\u00e1 Verkfr\u00e6\u00f0i- og T\u00e6knih\u00e1sk\u00f3lanum \u00ed Lahore \u00e1ri\u00f0 2010 og M.Phil pr\u00f3fi \u00ed t\u00e6knilegri e\u00f0lisfr\u00e6\u00f0i fr\u00e1 sama sk\u00f3la \u00e1ri\u00f0 2013. H\u00fan h\u00f3f doktorsn\u00e1m \u00ed e\u00f0lisfr\u00e6\u00f0i vi\u00f0 H\u00e1sk\u00f3la \u00cdslands hausti\u00f0 2014.<\/p>\n

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