• Title/Summary/Keyword: $ZnIn_2Se_4$

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The Effect of Additives on Twining in ZnO Varistors

  • Han, Se-Won;Kang, Hyung-Boo
    • The Korean Journal of Ceramics
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    • v.4 no.3
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    • pp.207-212
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    • 1998
  • By comparison of the experimental results in two systems of ZnO varistors, it's appear that Sb2O3 is the indispensable element for twining in ZnO varistors and the Zn7Sb2O12 spinel acts as the nucleus to form twins. Al2O3 is not the origin of twining in ZnO varistor, but it was found that Al2O3 could strengthen the twining and form a deformation twining by ZnAl2O4 dragging and pinning effect. The inhibition ratios of grain and nonuniformity of two systems ZnO varistors increase with the increase of Al2O3 content. The twins affect the inhibition of grain growth, the mechanism could be explained follow as: twins increase the mobility viscosity of ZrO grain and grain boundary, and drag ZrO grain and liquid grain boundary during the sintering, then the grain growth is inhibited and the microstructure becomes more uniform.

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Enhancing the Efficiency of Core/Shell Nanowire with Cu-Doped CdSe Quantum Dots Arrays as Electron Transport Layer (구리 이온 도핑된 카드뮴 셀레나이드 양자점 전자수송층을 갖는 나노와이어 광전변환소자의 효율 평가)

  • Lee, Jonghwan;Hwang, Sung Won
    • Journal of the Semiconductor & Display Technology
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    • v.19 no.4
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    • pp.94-98
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    • 2020
  • The core/shell of nanowires (NWs) with Cu-doped CdSe quantum dots were fabricated as an electron transport layer (ETL) for perovskite solar cells, based on ZnO/TiO2 arrays. We presented CdSe with Cu2+ dopants that were synthesized by a colloidal process. An improvement of the recombination barrier, due to shell supplementation with Cu-doped CdSe quantum dots. The enhanced cell steady state was attributable to TiO2 with Cu-doped CdSe QD supplementation. The mechanism of the recombination and electron transport in the perovskite solar cells becoming the basis of ZnO/TiO2 arrays was investigated to represent the merit of core/shell as an electron transport layer in effective devices.

III-V Tandem, CuInGa(S,Se)2, and Cu2ZnSn(S,Se)4 Compound Semiconductor Thin Film Solar Cells (3-5족 적층형과 CuInGa(S,Se)2 및 Cu2ZnSn(S,Se)4 화합물반도체 박막태양전지)

  • Jeong, Yonkil;Park, Dong-Won;Lee, Jae Kwang;Lee, Jaeyoung
    • Applied Chemistry for Engineering
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    • v.26 no.5
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    • pp.526-532
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    • 2015
  • Solar cells with other alternative energies are being importantly recognized related with post-2020 climate change regime formation. In a point of view of materials, solar cells are classified to organic and inorganic solar cells which can provide a plant-scale electricity. In particular, recent studies about compound semiconductor solar cells, such as III-V tandem solar cells, chalcopyrite-series CIGSSe solar cells, and kesterite-series CZTSSe solar cells were rapidly accelerated. In this report, we introduce a research trend and technical issues for the compound semiconductor solar cells.

Improvement of Efficiency of Cu(Inx,Ga1-x)Se2 Thin Film Solar Cell by Enhanced Transparent Conductive Oxide Films (투명 전도막 개선을 통한 Cu(Inx,Ga1-x)Se2 박막태양전지 효율 향상에 관한 연구)

  • Kim, Kilim;Son, Kyeongtae;Kim, Minyoung;Shin, Junchul;Jo, Sunghee;Lim, Donggun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.27 no.4
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    • pp.203-208
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    • 2014
  • In this study, Sputtering method was used to grow Al-dopes ZnO films on a CIGS absorber layer, in order to examine the effect of TCO on properties of CIGS solar cell devices. Structural, electrical and optical properties were investigated by varied thickness of Al-dopes ZnO films. Also, relation to the application as a window layer in CIGS thin film solar cell were studied. It was found that the electrical and structural properties of ZnO:Al film improved with increasing its thickness. However, the optical properties degraded. Jsc of the fabricated CIGS based solar cells was significantly influenced by the variation of the ZnO:Al window layer thickness. Because ZnO:Al window layer is one of the Rs factors in CIGS solar cell. Rs has the biggest influence on efficiency characteristic. In order to obtain high efficiency of CIGS solar cell, ZnO:Al window layer should be fabricated with electrically and optically optimized.

Effects of Deletion of P, Ca, Zn, Mg, Fe, K, Mn, or Se from Mineral Premix in the Diets Containing $40\%$ Fish Meal on Growth Performance of Juvenile Korean Rockfish (Sebastes schlegeli) (어분이 $40\%$ 함유된 배합사료에 P, Ca, Zn, Mg, Fe, K, Mn과 Se 무 첨가가 조피볼락의 성장에 미치는 효과)

  • LEE Sang-Min;PARK Sung-Real;KIM Tae Jin;MEONG Jeong-In;CHANG YoungJin
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.31 no.2
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    • pp.252-258
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    • 1998
  • A feeding experiment was conducted to investigate the effects of deletion of P, Ca, Zn, Mg, Fe, K, Mn, or Se from mineral premix in the diets containing $40\%$ fish meal on growth performance of juvenile Korean rockfish. Three replicate groups of the fish initially averaging 5.4 g were fed the experimental diets deleted one ot each mineral (P, Ca, Zn, Mg, Fe, K, Mn, Se or all) in the mineral premix for 9 weeks. A basal diet with fish meal ($40\%$), meat meal ($9\%$), soybean meal ($5\%$), corngluten meal ($3\%$), and leather meal ($3\%$) as protein sources were included. Weight gain in fish fed diets deleted Ca, Zn, K, or Se was lower than that of control diet ( P<0.05). Daily feed intake, condition factor, hepatosomatic index and liver chemical composition were not affected by dietary mineral premixes (P>0.05). Apparent skeletal deformities were not observed in the diets deleted each mineral, The data obtained in this study indicate that each of the Ca, Zn, K, or Se should be added in the diet contained $40\%$ fish meal for normal growth of Korean rockfish.

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Synthesis of Solution-Processed Cu2ZnSnSe4 Thin Films on Transparent Conducting Oxide Glass Substrates

  • Ismail, Agus;Cho, Jin Woo;Park, Se Jin;Hwang, Yun Jeong;Min, Byoung Koun
    • Bulletin of the Korean Chemical Society
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    • v.35 no.7
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    • pp.1985-1988
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    • 2014
  • $Cu_2ZnSnSe_4$ (CZTSe) thin films were synthesized on transparent conducting oxide glass substrates via a simple, non-toxic, and low-cost process using a precursor solution paste. A three-step heating process (oxidation, sulfurization, and selenization) was employed to synthesize a CZTSe thin film as an absorber layer for use in thin-film solar cells. In particular, we focused on the effects of sulfurization conditions on CZTSe film formation. We found that sulfurization at $400^{\circ}C$ involves the formation of secondary phases such as $CuSe_2$ and $Cu_2SnSe_3$, but they gradually disappeared when the temperature was increased. The formed CZTSe thin films showed homogenous and good crystallinity with grain sizes of approximately 600 nm. A solar cell device was tentatively fabricated and showed a power conversion efficiency of 2.2% on an active area of 0.44 $cm^2$ with an open circuit voltage of 365 mV, a short current density of 20.6 $mA/cm^2$, and a fill factor of 28.7%.

Growth and characterization of $Cu_2ZnSnSe_4$ (CZTSe) thin films by sputtering of binary selenides and selenization

  • Munir, Rahim;Jung, Gwang-Sun;Ahn, Byung-Tae
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2012.05a
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    • pp.98.2-98.2
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    • 2012
  • Thin film solar cells are growing up in the market due to their high efficiency and low cost. Especially CdTe and $CuInGaSe_2$ based solar cells are leading the other cells, but due to the limited percentage of the elements present in our earth's crust like Tellurium, Indium and Gallium, the price of the solar cells will increase rapidly. Copper Zinc Tin Sulfide (CZTS) and Copper Zinc Tin Selenide (CZTSe) semiconductor (having a kesterite crystal structure) are getting attention for its solar cell application as the absorber layer. CZTS and CZTSe have almost the same crystal structure with more environmentally friendly elements. Various authors have reported growth and characterization of CZTSe films and solar cells with efficiencies about 3.2% to 8.9%. In this study, a novel method to prepare CZTSe has been proposed based on selenization of stacked Copper Selenide ($Cu_2Se$), Tin Selenide ($SnSe_2$) and Zinc Selenide (Zinc Selenide) in six possible stacking combinations. Depositions were carried out through RF magnetron sputtering. Selenization of all the samples was performed in Close Space Sublimation (CSS) in vacuum at different temperatures for three minutes. Characterization of each sample has been performed in Field Emission SEM, XRD, Raman spectroscopy, EDS and Auger. In this study, the properties and results of $Cu_2ZnSnSe_4$ thin films grown by selenization will be presented.

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Analysis of Antioxidant Nutrients in Green Yellow Vegetable Juice (녹즙의 항산화 영양성분 분석)

  • Chung, So-Yong;Kim, Hyeon-Wee;Yoon, Sun
    • Korean Journal of Food Science and Technology
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    • v.31 no.4
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    • pp.880-886
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    • 1999
  • The present study was attempted to investigate the contents of antioxidant nutrients in green juice of Angelica keiskei, kale, carrot, celery, cucumber. All 5 green juice were found to contain antioxidant nutrients such as ${\beta}-carotene$, vitamin E, vitamin C, Se, Cu, Mn, Zn and phenols. ${\beta}-carotene$ contents of carrot, kale, Angelica keiskei, celery and cucumber juice were 5909.0, 3285.3, 1398.4, 176.7 and 61.4 mg/l00 g, respectively. ${\alpha}-tocopherol$ contents of 5 green juices were $0.04{\sim}1.41$ mg/l00 g. Kale juice had highest ${\alpha}-tocopherol$ and celery juice contained lowest, kale juice also contained highest vitamin C (105.1 mg/l00 g) and Angelica keiskei, cucumber, celery and carrot had vitamin C contents of 31.4, 9.3, 7.5 and 5.2 mg/l00 g, respectively. Angelica keiskei had highest amount of antioxidant minerals among the sample such as Cu (0.40 mg/l00 g), Mn (0.5 mg/l00 g), Zn (0.24 mg/l00 g), Se $(0.61\;{\mu}g/kg)$. Kale was the second best source of antioxidant minerals which were Cu (0.45 mg/l00 g), Mn (0.22 mg/l00 g), Zn (0.24 mg/l00 g), Se $(0.33\;{\mu}g/kg)$. However, celery and cucumber were poor in antioxidant minerals. Total phenolic contents of 5 green juices were $0.01\;{\sim}0.05%$, kale juice also had highest total phenolics among the samples.

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Effect of Temperature on the Characteristics of ZnO Thin Film Applied to the Window Layer of CIGS Solar Cells (CIGS 태양전지의 윈도우 층에 적용되는 ZnO 박막 특성에 관한 온도의 영향)

  • Jung, Kyung Seo;Kwon, Sang Jik;Cho, Eou Sik
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.4
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    • pp.304-308
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    • 2013
  • For the application to the window layer of $Cu(In,Ga)Se_2$(CIGS) solar cell, zinc oxide(ZnO) thin film was deposited at various temperatures by in-line pulsed DC sputtering. From the structural, optical, and electrical investigation and analysis, it was possible to obtain the lower thickness, the lower resistivity, and the higher transmittance at a higher process temperature. The energy band gap of ZnO was calculated using the transmittance data and was analyzed in terms of the dependency on temperature. From the X-ray diffraction(XRD) results, it was possible to conclude that a dominant peak was found about $34.2{\sim}34.6^{\circ}$(111) and crystallinity was obtained at a temperature above $150^{\circ}C$.

Sputtered Al-Doped ZnO Layers for Cu2ZnSnS4 Thin Film Solar Cells

  • Lee, Kee Doo;Oh, Lee Seul;Seo, Se-Won;Kim, Dong Hwan;Kim, Jin Young
    • Proceedings of the Korean Vacuum Society Conference
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    • 2013.02a
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    • pp.688-688
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    • 2013
  • Al-doped ZnO (AZO) thin films have attracted a lot of attention as a cheap transparent conducting oxide (TCO) material that can replace the expensive Sn-doped In2O3. In particular, AZO thin films are widely used as a window layer of chalcogenide-based thin film solar cells such as Cu(In,Ga)Se2 and Cu2ZnSnS4 (CZTS). Mostly important requirements for the window layer material of the thin film solar cells are the high transparency and the low sheet resistance, because they influence the light absorption by the activelayer and the electron collection from the active layer, respectively. In this study, we prepared the AZO thin films by RF magnetron sputtering using a ZnO/Al2O3 (98:2wt%) ceramic target, and the effect of the sputtering condition such as the working pressure, RF power, and the working distance on the optical, electrical, and crystallographic properties of the AZO thin films was investigated. The AZO thin films with optimized properties were used as a window layer of CZTS thin film solar cells. The CZTS active layers were prepared by the electrochemical deposition and the subsequent sulfurization process, which is also one of the cost-effective synthetic approaches. In addition, the solar cell properties of the CZTS thin film solar cells, such as the photocurrent density-voltage (J-V) characteristics and the external quantum efficiency (EQE) were investigated.

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