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0402U000973,
к.ф.-м.н.
28-03-2002
o
Photoacoustic spectroscopy of nanoscale semiconductor structures
Salnykov Vadym Oleksandrovych,
popup.head Blonskiy I.V.
popup.opponent Корбутяк Д.В.
popup.opponent Бурбело Р.М.
Дисертація присвячена дослідженню властивостей напівпровідникових структур з квантовими точками за допомогою фотоакустичної спектроскопії. В дисертації вперше експериментально показано, що для ансамблю поглинаючих світло термоізольованих часток властивий ефект фотогенерації звуку гігантської інтенсивності, який є наслідком локального перегріву фотозбуджених часток і релаксації енергії перегріву через генерацію пружних пульсаційних коливань. Виявлено і пояснено природу відмінностей спектральних і частотних залежностей амплітуди і зсуву фаз фотоакустичного відклику при газомікрофонній реєстрації сигналу кластерних фаз прямозонних напівпровідників в залежності від щільності діелектричних матриць. Виявлено "фіолетовий" зсув крайового поглинання нанофаз CdS і PbI2, який пояснено з позицій впливу квантово-розмірного ефекту в перенормування спектра електронних збуджень. Запропоновано новий метод визначення коефіцієнта температуропровідності, за допомогою якого показано, що для шарів пористого кремнію при пористості 70 %, значення коефіцієнта температуропровідності тотожне відповідному для SiO2. Отримані результати поглиблюють розуміння фізичних процесів, які протікають в ансамблі фотозбуджених напівпровідникових наночасток, та засвідчують перспективність використання фотоакустичної спектроскопії як методичної бази для вивчення властивостей цього класу матеріалів.
2002-03-28
2020-04-04
Updated: 2025-12-07
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