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Мониторинг Ð¿Ð¾Ð²ÐµÑ€Ñ Ð½Ð¾ÑÑ‚Ð¸ GaAs как способ контроля температуры при молекулярно-пучковой эпитаксии

выпускная квалификационная работа бакалавра

Мониторинг Ð¿Ð¾Ð²ÐµÑ€Ñ Ð½Ð¾ÑÑ‚Ð¸ GaAs как способ контроля температуры при молекулярно-пучковой эпитаксии

Abstract

В рамках данной работы был разработана методика косвенного определения температуры ростовой поверхности в процессе молекулярно-пучковой эпитаксии. Детальны анализ температур реконструкционных переходов, исследованных при различных условиях МПЭ на поверхности GaAs in situ методом дифракции быстрых электронов на отражение, а также температур, определяемых с помощью термопары и ИК-пирометра, показывает, что разница между реальными (TS) и измеряемыми (TTC, TPIR) значениями температур для подложек GaAs(001) и GaAs(111)B может достигать ~100–120°С. В работе описывается набор реперных точек, которые могут быть использованы при создании калибровочных зависимостей TTC/TPIR и TS как функции мощности РТС нагревателя. Исследование реконструкционных переходов на поверхности полуизолирующей подложки GaAs(111)B позволило определить, что температура реконструкционного перехода между состояниями (2×2) и (√19×√19)R23.4° находится в диапазоне ТS = 540–550°С при динамическом режиме спуска температуры подложки со скоростью 15 °C/мин и потоке As РВЕР= 10-5 Па.

This thesis is devoted to developing of a method of the indirect temperature determination during the MBE growth. A detailed analysis of reconstruction transitions studied under various MBE conditions on the GaAs surface by reflection high-energy electron diffraction (RHEED) technique, as well as the MBE temperatures determined using a thermocouple and an IR pyrometer, shows that the difference between the real (TS) and measured (TTC, TPIR) temperature scan reach ~100–120°C for GaAs(001) and GaAs(111) B substrates. The developed method describes a set of reference points that can be used to create the calibration curves TTC/TPIR and TS as a function of the PTC heater power. The study of reconstruction transitions on the surface of a undoped GaAs(111)B substrate made it possible to determine that the temperature of the reconstruction transition between the (2×2) and (√19×√19)R23.4° states is in the range ТS = 540–550°С at the dynamic mode of decreasing the substrate temperature at a rate of 15°C/min and a As flux of РВЕР= 10-5 Pa.

Keywords

реконструкционные состояния, reconstruction, molecular beam epitaxy, молекулярно-пучковая эпитаксия, ИК-пирометр, GaAs, реконструкционные Ð¿ÐµÑ€ÐµÑ Ð¾Ð´Ñ‹, термопара, pyrometer, reconstruction modifications, reflection high-energy electron diffraction, дифракция Ð±Ñ‹ÑÑ‚Ñ€Ñ‹Ñ ÑÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð¾Ð², thermocouple

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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