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Ultra-visokovakuumski sistem za naparevanje organskih polprevodnikov = Ultrahigh-vacuum system for growth of organic semiconductor layersHudej, Robert ; Bratina, GvidoV Laboratoriju za epitaksijo in nanostrukture na Politehniki Nova Gorica je bila nedavno zaključena instalacija novega sistema za naparevanje organskih polprevodnikov z epitaksijo z molekularnimi ... curki. V laboratoriju tečejo raziskave elektronskih lastnosti tankih slojev organskih polprevodnikov že tretje leto. Do sedaj so bili vzorci pripravljeni z naparevanjem v visoko-vakuumskem sistemu, ki je onemogočal spremljanje rasti kristalov med naparevanjem, ter s tem učinkovito uravnavanje pogojev rasti urejenih struktur. Nov sistem je zgrajen okrog ultravisoko-vakuumske posode, na katero je priključena turbomolekularna črpalka opremljena z dvostopenjsko rotacijsko črpalko, kar omogoča doseganje tlaka do 1.0x10[sup]-10 Torr. Sloje 3,4,9,10-perilendianhidrida tetrakarboksilne kisline, sicer polprevodnika z energijsko špranjo 2.2 eV, naparevamo iz nizkotemperaturne Knudsenove celice. Sistem za uklon in odboj hitrih elektronov, ki je priključen na komoro, omogoča natančno spremljanje kristalografskih značilnosti slojev med naparevanjem, medtem ko masni kvadrupolni spektrometer daje informacijo o sestavi molekularnih curkov. Substrati so nameščeni na manipulatorju, ki omogoča uravnavanje temperature v območju od -140°C do 1000°C. Vstavljanje substratov poteka preko predkomore z ločenim črpalnim sistemom. V prihodnosti bo na komori instaliran le elipsometer, ki trenutno deluje ločeno. Z njim bo mogoče meriti optične lastnosti naparjenih plasti med samim naparevanjem. Po zaključku testiranja, ki vključuje preverjanje enakomernosti debeline in sestave slojev ter kalibracijo hitrosti naparevanja, bomo začeli s sistematičnimi raziskavami načinov rasti organskih polprevodnikov, pomembnih s stališča optoelektronskih aplikacij. Poznavanje osnovnih procesov pri stiku molekul s substratom, bo omogočilo optimizacijo pogojev naparevanja in njihovo prilagoditev željeni strukturi. Sistem bo omogočal natančno izdelavo kvantnih struktur ter odprl pot do eksperimentalnega študija pojavov v nizkodimenzionalnih sistemih.Source: [Program in knjiga povzetkov] = [Program and book of abstracts] (Str. 158)Type of material - conference contributionPublish date - 2000Language - slovenian, englishCOBISS.SI-ID - 159227
Author
Hudej, Robert |
Bratina, Gvido
Topics
polprevodniki |
fizika |
naparevanje |
epitaksija |
molekularni curki
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Hudej, Robert | 20657 |
Bratina, Gvido | 06617 |
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