• Title/Summary/Keyword: Ge doped

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Photodarkening and Thermal Bleaching Effect in Ge-doped Multicomponent Oxide Glasses by UV Irradiation (자외선 조사에 따른 게르마늄 함유 다성분계 산화물 유리의 광흑화와 열표백화 현상)

  • 이회관;오영석;강원호
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.3 no.3
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    • pp.161-165
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    • 2002
  • Ge-doped rnulticomponent oxide glasses were prepared by a conventional melting method. The change of micro structure in glasses was investigated by using PL (photoluminescence) and ESR (electron spin resonance). Before UV irradiation, the PL intensity increased according to germanium contents, but decreased the intensity as soon as UV irradiation. A changed property was recovered near it original properties when it was annealed. These photodarkening and thermal bleaching effect were observed by ESR intrument. These effect did not change the glass phase but vary only change of micro structure.

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The effects of Germanium concentration and Hydrogen loading time on the growth of fiber Bragg grating (Ge 도핑농도와 수소처리시간 변화가 광섬유격자 형성에 미치는 영향)

  • Song, J.H.;Lee, J.H.;Song, J.T.;Lee, K.S.;Lee, Y.S.;Jeon, C.O.;Jeon, K.I.
    • Proceedings of the KIEE Conference
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    • pp.993-995
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    • 1998
  • We fabricated fiber gratings with three different Ge-doped fibers exposed to 60atm pressure of Hz gas at 90"C for different times and studied the effects of Ge-doping concentration and $H_2$ loading time on the growth of gratings. According to experiments. the growing effect of hydrogen loading on high Ge-doped fiber was great.

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Carbon이 첨가된 Ge-doped SbTe 상변화재료의 박막 및 소자 특성

  • An, Hyeong-U;Park, Yeong-Uk;O, Cheol;Jang, Gang;Jeong, Jeung-Hyeon;Lee, Su-Yeon;Jeong, Du-Seok;Kim, Dong-Hwan;Jeong, Byeong-Gi
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.55-55
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    • 2011
  • 질소 등을 GST225 상변화재료에 첨가시켜 비저항을 증가시킴으로서 PCRAM의 동작 전류를 감소시킨 연구가 선행된 바 있다. 본 연구에서는 GST225와 달리 고속 동작 특성을 갖는 것으로 널리 알려진 Ge-doped SbTe (GeST) 상변화 재료에 Carbon을 첨가하여 박막 특성을 연구하여 동작 전류 감소의 가능성을 타진하였다. 실험을 위한 박막 제작을 위해 2 inch size의 GeST 및 C doped GeST (C-GeST) single target을 이용하여 RF magnetron co-sputtering 하였다. 박막은 carbon이 첨가되지 않은 GeST와 carbon 첨가량이 늘어나는 순서로 C-GeST 1, C-GeST 2, C-GeST 3로 구성된다. 이 때 제작한 박막의 composition analysis를 위해 XRF/RBS/AES가 사용되었고 제작된 박막의 기본적인 특성평가를 위해 resistivity(${\rho}$)와 crystallzation temp.(Cx), surface morphology(AFM), x-ray diffraction pattern(XRD)를 측정하였다. 실험결과 GeST, C-GeST 1, C-GeST 2, C-GeST 3 박막의 Cx는 각각 209, 225, 233, $245^{\circ}C$로 측정되어 carbon 첨가량이 증가됨에 따라 결정화 온도가 증가되는 것을 알 수 있었다. 또한 ${\rho}$도 마찬가지로 annealing 온도를 약 $320^{\circ}C$로 할 경우 ${\rho}$(as-dep)와 ${\rho}$(crystalline) 모두 0.03 / $2.61*10^{-6}$, 0.08 / $7.93*10^{-6}$, 0.09 / $11.99*10^{-6}$, 0.13 / $13.49*10^{-6}{\Omega}{\cdot}m$로 증가하였다. 증가된 ${\rho}$의 원인이 박막의 grain size의 감소라고 단언 할 수는 없으나 AFM 측정결과 grain이라고 추측되는 박막 feature들의 size가 점차 감소하는 것을 확인하였다.

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고 투과, 저 저항 Ge-doped $In_2O_3$ (IGO) 투명 전극의 특성 평가 연구

  • Gang, Sin-Bi;Kim, Han-Gi
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.192-192
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    • 2013
  • 본 연구에서는 RF/DC 마그네트론 스퍼터링 시스템을 이용하여co-sputtering 방법으로 성장시킨 고이동도를 갖는Ge-doped $In_2O_3$In2O3 (IGO) 박막의 전기적, 광학적, 구조적 특성을 평가하고, 이를 유기태양전지와 유기발광다이오드에 적용함으로써 고이동도 IGO 투명전극의 소자 적용가능성을 타진하였다. GeO2 타겟에 인가되는 도핑 Power와 급속열처리 온도가 30 W, $500^{\circ}C$일 때, 최적화 된 IGO 박막으로부터 $2.8{\times}10^{-4}$ Ohm-cm의 낮은 비저항과 86.9% (550 nm)의 높은 투과도를 확보하였다. 뿐만 아니라 Near Infra-red (750~1,200 nm) 영역에서의 IGO투명전극의 광투과율이 결정질의 ITO보다 높은(약15%) 투과도를 보이는 것을 통해 IGO박막의 높은 LAS (Lewis Acid Strength) 값을 가지는 Ge 원소의 도핑이 NIR 영역의 광투과율 향상에 미치는 영향을 확인할 수 있었다. 최적 조건의 IGO 박막을 적용하여 Fill Factor 67.38%, Short circuit current density 8.43 mA/cm2, open circuit voltage 0.60 V, efficiency 3.44%의 유기태양전지 및 19.24%의 외부양자효율을 갖는 유기발광다이오드를 제작함으로써 결정질 ITO 전극(20.05%)을 대체할 수 있는 고투과, 고이동도 IGO 투명 전극 및 이를 이용한 광전소자 적용 가능성을 타진하였다.

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A Study on the High-Temperature Characteristics of a Tunable All-Optical Filter Using Fiber Bragg Grating (FBG를 이용한 파장가변 형 전광 필터의 고온 특성에 관한 연구)

  • Son, Yong-Hwan;Yang, Se-Hoon;Kim, Hyun-Seung;Han, Sang-Kook
    • Journal of IKEEE
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    • v.14 no.4
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    • pp.263-269
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    • 2010
  • In this paper, we present high temperature characteristics of a tunable all-optical filter using fiber Bragg grating(FBG) filter in Ge doped and Ge & B co-doped fiber, including peak reflectivity, bandwidth and various normalized refractive index change with temperature variation. The reflection spectrum of a FBG filter with refractive index change is affected by its thermal stability. Consequently Ge doped FBG tunable filter has a better thermal stability than Ge & B co-doped FBG tunable filter. Also, both FBG tunable filters show good thermal stability up to about $500^{\circ}C$.

THERMOLUMINESCENCE DOSIMETRIC PROPERTIES OF Ge- AND Er-DOPED OPTICAL FIBRES AND THEIR APPLICATION IN THE MEASUREMENT OF DEPTH -DOSE IN SOLID WATER PHANTHOM

  • Amin, Y.M.;Abdulla, Y.A.;Khoo, B.H.
    • Journal of Radiation Protection and Research
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    • v.26 no.3
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    • pp.143-147
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    • 2001
  • The dosimetric properties of Ge- and Er-doped optical fibres are studied. The Ge-doped fibre is found to be more sensitive to radiation and there is little fading of TL signal compared with Er-doped fibre. The Ge- and Er-doped fibres showed a linear response over a range of ${\sim}1\;Gy$ to about 120 Gy and ${\sim}1Gy$ to about 250Gy respectively. The Ge-doped fibre is found to be dose-rate independent both for photons and electron beams of energy ranging from 6 to 10 MeV and 6 to 12 MeV respectively. The fibre is energy independent for energy greater than ${\sim}0.1\;MeV$ for photon or 0.1 MeV for electron beam. From the depth-dose measurement, it was found that the position of maximum dose, dmax, increased with increasing energy ranging from ${\sim}2\;cm$ and ${\sim}2.5\;cm$ for 6 MeV and 10 MeV photons respectively. The central axis percentage depth dose at 10 cm depth was found to be in good agreement with the value obtained using ionization chamber.

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Ge-doped Boro-Phospho-Silicate Glass Micro-lens Array Produced by Thermal Reflow (가열용융 방법에 의한 Ge-BPSG 마이크로렌즈 어레이 제작)

  • Jeong, Jin-ho;Oh, Jin-Gyeong;Choi, Jun-Seok;Choi, Gi-Seon;Lee, Hyeong-Jong;Bae, Byeong-Seong
    • Korean Journal of Optics and Photonics
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    • v.16 no.4
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    • pp.340-344
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    • 2005
  • Microlens cells of Ge-doped BPSG (Boro-Phospho-Silicate Glass) are fabricated by dicing the film produced by FHD (Flame Hydrolysis Deposition). Microlens arrays of $53.4{\mu}m$ square unit are produced by the thermal reflow of the diced unit cells at $1200^{\circ}C$. The gap between the microlenses was about $70{\mu}m,$ and the thickness of the produced lens was about $28.4{\mu}m$. We analyzed the reflowed shape of the microlens cell by an image-process technique, and the focal length was about $62.2{\mu}m$. This method of fabricating a microlens is simple and inexpensive compared to the conventional method using the photolithographic process. Also, the control of the radius of curvature of the microlens is easier and a more precise microlens way of various types can be fabricated using this method.

A Study of Gamma-ray Irradiation Effects on Commercially Available Single-mode Optical Fiber using Fiber Bragg Grating Sensor Systems (광섬유 브래그 격자 센서를 이용한 국내외 상용 단일모드 광섬유의 감마선 영향 연구)

  • Kim, Jong-Yeol;Lee, Nam-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.10
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    • pp.2287-2292
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    • 2012
  • In this study, $Co^{60}$ gamma-ray induced loss on Ge-doped single mode (SM) fiber has been measured. Gamma-ray is irradiated for 4 hours at the dose rate of 0.5 kGy/hr, 2 kGy/hr, 8 kGy/hr. Consequently, gamma-ray induced loss based on radiation effects in Ge-doped SM fiber occur significantly. Furthermore, dose rate effect was observed, that dose rate using the same total dose increased higher, then optical fiber loss increased more. Also annealing effect was observed, that the loss after irradiation, increased higher, then the recovery rate of loss was increased. This results are foreseen to be base data in the future radiation-hardened optical fiber study.