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기상반응법에 의한 CdS의 생장 및 photo-luminescence

Title
기상반응법에 의한 CdS의 생장 및 photo-luminescence
Other Titles
Growth of CdS Crystals by Vapor-Phase Reaction Method and Their Photoluminescence Study
Authors
金美廷
Issue Date
1983
Department/Major
대학원 물리학과
Keywords
기상반응법CdS생장photo-luminescence
Publisher
이화여자대학교 대학원
Degree
Master
Advisors
정중현
Abstract
CdS분말을 소결(sintering)하여 기상반응(vapor-phase reaction)법으로 CdS결정을 생장시키어 이들의 형태를 관찰하고 photoluminescence(PL)를 측정하였다. 생장된 결정은 platelet, needle, hexagonal rod형 등이었으며, 이들의 PL을 측정하였던 바, 12K에서 zero phonon peak의 위치가 517.6㎚(2.395eV)이었으며 장파장쪽으로 38meV간격으로 4개의 longitudinal optical(LO) phonon replica를 얻었는데, 이것이 구속정공과 구속전자의 재결합에 기인하는 low temperature(LT) emission이며 552.6㎚를 제외한 4개의 피크들은 Pedrotti등의 G_(5), G_(7), G_(9), G_(11)에 해당한다. 또한 77K에서는 zero phonon peak의 위치가 514.0㎚(2.412eV)이었고 장파장쪽으로 3개의 LO phonon replica를 가지고 있으며 이것은 자유전자와 구속된 정공과의 재결합에 기인하는 high temperature(HT) emission 이고 Pedrotti 등의 G_(4), G_(6), G_(8), G_(10)에 해당한다. 그리고 480∼510㎚ 영역에서 blue edge emission을 얻었으며 730∼750㎚부근에 peak을 가진 red band와 500∼600㎚ 부근에 peak을 가진 orantge band를 얻었다.;CdS crystals were grown by vapor-phase reaction (VPR) method from the sintered CdS cake. The morphology of the grown crystals was studied and the photoluminescence measurements were carried out The obtained crystals had the forms of platelet, needle-like, or hexagonal rods. From the photoluminescence measurement at 12K, zero-phonon peak was observed at 517.6nm (2.395eV) together with four longitudinal optical phonon replicas with the energy separation of 38 meV each in the region of green edge emission due to bound electron-bound hole recombination. The four peaks except the one phonon (552.6nm) correspond to Pedrotti's G_(5), G_(7), G_(9), and G_(11), respectively. At 77K, Zero-phonon line peaked at 514.0nm (2.412eV) together with three longitudinal optical phonons. These peaks correspond to those of Pedrotti's G_(4), G_(6), G_(8), and G_(10) which are due to free electron-bound hole recombination. The photoluminescence spectra also showed the blue edge emission (480-510 nm), red broad band (730-750 nm) and the orange broad band(580-600nm).
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