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n-CdS/p-Si Heterojunction 太陽電池의 電氣的 特性
李海翼 又石大學校 1985 論文集 Vol.7 No.-
The n-CdS/-p-Si Heterojunction Solar Cell was fabricated by depositing CdS thin film on the p-Si(100) single crystal by chemical bath deposition method. X-ray diffraction patterns revealed that anealed CdS thin film at 350℃ for an hour crystallized Cubic ZnS structure in the air. Spectral Response of the cell showed that photocurrents were generated both n-CdS region and p-Si region. The absorption edge of Si was about 110nm. Under 80 mW/Cm^2 condition the parameterers for the cell were as followed; open circuit voltage Voc=0.53V, short circuit current Isc=11.3mA, fill factor F.F=0.35 and conversion efficiency n=2.63%.
L.P.E에 의한 Al_xGa_(1-x)As 에피층의 성장 조건과 불순물 주입 효과
이해익,박순규 又石大學校 1994 論文集 Vol.16 No.-
GaAs and AlGeAs epitaxial layers were grown on semi-insulating GaAs substrate by liquid phase epitaxy. We tried to find the best growing condition for high quality GaAsepitaxial layers by measuring the electrical properties using C-V method, Hall method and DLTS. Carrier concentration of undoped GaAs epitaxial layer, grown using the Ga+GaAs solution annealed at 800℃ in hydrogen atmosphere for 24 hours, showed the best properties. The carrier concentration is 4.0×10 exp (15)cm^-3 and the mobiliy is 4,405cm^2/V-sec. By DLTS, we observed the electron trap E_1(E_c-0.56eV, 2.3×10 exp (-18)cm^2) in undoped GaAs layers and Te-doped GaAs layers, the electron traps E_2(E_c-0.27eV, 5.0×10 exp (-13)㎝) and E_3(E_c-0.67eV, 6.0×10 exp (-17)cm^2) in Te-doped Al_0 _34Ga_0 _46As layers. We observed the hole traps H_1(E_v+0.45eV, 1.7×10 exp (-20)cm^2), H_2(E_v+0.35eV, 6.2×10 exp (-21)cm^2) and H_3(Ev+0.50eV, 1.6×10 exp (-19)cm^2) in p-type Mg-doped AIGaAs samples. We think, H_3 is Mg related hole trap.
이해익,박경숙,최용순,이상영 한국산업미생물학회 1991 한국미생물·생명공학회지 Vol.19 No.5
Peroxidase를 다량 함유하는 식물체를 검색할 목적으로 십자화과 식물 9종에 대하여 효소활성 분포를 조사하였다. 검색한 식물체 중 배추 뿌리에서 본 효소의 활성이 강하게 나타나 배추 뿌리로부터 본 효소의 정제를 행하였다. 정제된 효소는 분자량 50,000의 단량체로서 pH 7.0, 50℃에서 최적 활성을 나타내었다. phenol 및 phenol 유도체가 좋은 기질로 작용하였으며 pyrogallol에 대한 H_2O_2의 Km값은 1.6mM이었다. 본 효소는 406㎚에서 Soret 흡수대를 나타내어 다른 peroxidase와 마찬가지로 분자내 보결분자단으로 heme을 가지고 있음을 알았다. 정제된 배추뿌리 기원의 효소는 면역화학적, 전기영동적 성질이 horseradish 기원의 peroxidase와 유사하였다. The distribution of peroxidase activity in 9 kinds of cruciferous plants was investigated. Among the plants examined, peroxidase activity was found to be high levels in roots of Chinese cabbage. One kind of peroxidase was purified approximately 56-fold from crude extracts of Chinese cabbage roots. The molecular weight of the enzyme was 50,000 and consisted oif a single polypeptide chain, as estimated by sodium dodecyl sulfate polyacrylamide gel electrophoresis and Sephadex G-150 gel column chromatography. The enzyme showed optimum activity at pH 7.0 and 50℃. Phenol and phenol derivatives serves as substrates of the enzyme and Km value for H_2O_2 was 1.6 mM toward pyrogallol. The enzyme showed a Soret band at 406 ㎚ and this result indicate that the enzyme contained heme as a prosthetic group. The immurochemical and electrophoretic properties of purified peroxidase from Chinese cabbage were very similar to horseradish peroxidase.
미생물에 있어서 글리옥살라아제 I의 효소학적, 유전학적 고찰
이해익 한국미생물 · 생명공학회 1990 한국미생물·생명공학회지 Vol.18 No.1
효모나 세균을 이용한 메칠글리옥살 대사의 효소학적, 유전학적 연구로부터 생물체들은 메칠글리옥살의 해독을 위하여 보편적이고 다양한 경로를 가지고 있음을 알았다. 이들 대사경로 가운데 글리옥살라아제 I은 메칠글리옥살 해독에 있어서 가장 중요한 경로이다. 글리옥살라아제 I의 분자구조는 효소의 기원에 따라 크게 다르게 나타났고, 아연 이온은 효소활성에 필수적이었다. Pseudomonas putida의 글리옥살라아제 I은 유전자는 메칠글리옥살리아의 제거제로 작용하였고, 또한 세균의 크기를 조절하는 역활을 가지고 있었다. 본 유전자의 염기배열과 정제효소의 아미노 말단을 비교해 본 결과 아미노 말단의 메치오닌 잔기는 번역 후 제거 됨을 알았다. 그밖에 글리옥살라아제 I의 생리학적 역활에 대해서도 논의하였다. The enzymatic studies on the methylglyoxal metabolism in yeast and bacterial cells indicated that organisms are equipped with the common and manifold systems for the detoxification of methylglyoxal. Among these systems, the glyoxalase I is the most important route for methylglyoxal detoxification. The molecular structure of glyoxalase I is apparently distinct from the enzyme sources, and zinc ion is an essential cofactor in enzyme activity. The gene for Pseudomonas putida glyoxalase I functioned as a scavenger of methylglyoxal and regulated the cell size of the bacterium. Comparison of the nucleotide sequence of the P. putida glyoxalase I gene with the N-terminal amino acid sequence of the purified enzyme revealed that the N-terminal methionine residue was removed after translation. Possible physiological role of glyoxalase I was also discussed.
Admittance Spectroscopy에 의한 CdTe의 Deep Energy Lerel에 관한 硏究
李海翼 又石大學校 1984 論文集 Vol.6 No.-
Trap energy levels, electron emission rates and trap concentrations were investigated by Admittance Spectroscopy Method for n type CdTe single crystal. The Ag-CdTe Schottky barrier was formed for Admittance measurements. It was found that there existed there deep energy levels between the CdTe band gap. One of the trap energy level (D_2) was calculated as Ec-0120eV. Electron emission rate en increased rapidly as temperature raised up and could be expressed en =9.3 x 10^9 exp (-(2.3-10^3)/(T) The value of trap concentration was 4 x 10^17 cm^-3 for D_2.