• Journal of Welding and Joining
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• 제12권1호
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• pp.94-101
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• 1994

In this study, plasma spraying has been used to produce $TiO_2$ polycrystalline coatings from $TiO_2$ powders. The physical and chemical properties of plasma sprayed $TiO_2$ coatings depend greatly on plasma spraying conditions. The electrical resistivity, oxygen concentration, photocurrent and crystal structure of plasma sprayed $TiO_2$ coating has been studied. The results are as follows: 1. The oxygen loss and electrical conductivity of $TiO_2$ plasma sprayed coatings increased by low pressure and high amount of auxiliary gas, hydrogen in plasma spraying. 2. Oxygen loss increase electrical conductivity, and decrease photocurrent of $TiO_2$ plasma sprayed coatings. 3. Photocurrent of $TiO_2$ plasma sprayed coatings manufactured in atmospheric pressure is higher than that of low pressure.

• 대한화학회지
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• 제34권6호
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• pp.600-605
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• 1990

광전기화학쎌, ITO/SnO$2$/rose bengal, NaClO$4$/Pt을 이용하여 들뜬 rose bengal로부터 박막 반도체 SnO$2$의 전도띠로 주입되는 전류의 크기를 조사하였다. 초감응제로써 urea를 첨가하여 광조사 시간의 경과에 따라 광전류는 증가하다가 일정시간 후에는 계속 감소하는 특성을 나타내었다. Urea를 포함하고 있는 염료용액을 분광학적인 방법으로 분석한 결과, 광화학 반응으로 염료의 농도는 시간에 따라 감소하지만 염료회합(dye aggregation)이 전류의 증가와 관련이 있는 것으로 나타났다.

• Bulletin of the Korean Chemical Society
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• 제30권1호
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• pp.97-101
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• 2009

A new approach was applied to examine the charge generation and transport in organic photoconductive devices by Monte‐Carlo simulation utilizing multiple site interactions of carriers with all other charges within Coulomb radius. Stepwise generation frame was considered first by a charge separation process that was counted in two separate transactions, i.e., hopping against physical decay and dissociation against recombination. Thereafter, diffusion/ drifting process of free carriers was counted to follow. This method enables to examine readily the photocurrent generated alongside the charge generation efficiency. The field and temperature dependences of the efficiency and photocurrent were obtained comparable to Onsager’s and experimental data.

• 한국광학회지
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• 제10권3호
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• pp.254-258
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• 1999

전계흡수형 반도체 광도파로에서 흡수된 빛에 의해 발생된 광전류는 전파되는 파장에 따라 Fabry-Perot 모드의 간섭패턴을 나타냄을 보이고, 이로부터 인가전압에 따른 흡수계수의 변화를 측정할 수 있는 방법을 제시하였다. 광전류 신호는 파장에 따라 공명 반공명을 반복해서 나타내며 그 진폭은 흡수계수의 크기에 의존하므로 전계에 따른 흡수계수의 변화량을 측정 할 수 있었고, 1.55 $\mu\textrm{m}$ 파장에서 역전압 1.5V 인가시 bulk in GaAsP의 흡수계수 변화는 대략 157cm-1임을 알 수 있었다.

• 한국전기전자재료학회논문지
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• 제16권7호
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• pp.622-626
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• 2003

We report the electrical properties of organic light emitting diodes (OLEDs) depending on the crystal structure of hole injection layer of copper(II)-phthalocyanine(CuPc) and the light irradiation the carrier mobility of copper(II)-phthalocyanine(CuPc) of light source. OLEDs were constructed with indium tin oxide(ITO)/CuPc/triphenyl-diamin(TPD)/tris-(8-hydroxyquinoline)aluminum(Alq$_3$)/Al.Photocurrent multiplication of OLEDs was varied by the heat-treatment condition of CuPc thin film and the light irradiation.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2007년도 추계학술발표대회 및
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• pp.57.1-57.1
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• 2007

• 한국재료학회:학술대회논문집
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• 한국재료학회 2007년도 추계학술발표대회 및
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• pp.58.2-58.2
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• 2007

• 한국표면공학회지
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• 제44권3호
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• pp.89-94
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• 2011

In this study, the photocurrent characteristics of plasma sprayed $TiO_2$ coatings have been investigated according to additive transition metal (Fe, Mn, Nb powder) and heat treatment conditions. The plasma sprayed $TiO_2$ coatings by heat treatment at $400^{\circ}C$ and 90 min had the higher photocurrent at ultraviolet light, no photocurrent at visible light. The photocurrent of plasma sprayed $TiO_2$ coatings added by Fe, Mn, Nb (named by plasma sprayed $TiO_2$ composite coatings) was lower than that of plasma sprayed $TiO_2$ coatings at ultraviolet light, as was low in intensity ratio of XRD(101)/(110). and the atomic percentage of oxygen by plasma sprayed $TiO_2$ composite coatings was higher than that by plasma sprayed $TiO_2$ coatings. The photocurrent of plasma sprayed $TiO_2$ composite coatings in heat treatment at $400^{\circ}C$ and 90 min was higher than that of plasma sprayed $TiO_2$ coatings in same heat treatment conditions at ultraviolet and visible light, as was high in oxygen affinity by heat treatment.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2005년도 춘계학술발표대회 및 제8회 신소재 심포지엄 논문개요집
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• pp.221-221
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• 2005

• 한국인쇄학회지
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• 제18권2호
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• pp.103-111
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• 2000

We synthesized hexapyrrolylbenzene(HPB) an octapyrrolylenaphthalene(OPN) and measured photocurrent and darkcurrent of them. At the result, photocurrent of HBP/TiOPc and OPN/TiOPc systems were 1.81E-11 and 1.04E-10 at electric field 4.4$\times$10$^3$V/cm, and efficiency of them were 16 and 167 respectively.