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Al0.85Ga0.15As/GaAs太阳能电池器件工艺优化研究 总被引:2,自引:0,他引:2
报道了优化的p-n型Al0.85Ga0.15As/GaAs太阳能电池器件工艺。分别采用真空蒸发Cr/Au和AuGeNi/Au制作下面栅线和背面电极,并分别在450℃和350℃下快速合金化形成欧姆接触。采用NH4OH:H2O2:H3PO4:H2O体系的选择性腐蚀液去除高掺杂的GaAs接触层。采用真空蒸发技术制备ZnS/MgF2双层复合减反射层。测试结果表明,采用优化工艺制备的器件的光电转换效率得到了 相似文献
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GaAs衬底层选择性腐蚀技术 总被引:2,自引:1,他引:1
本文在GaAsGaAlAs选择性腐蚀的基础上进行了腐蚀GaAs衬底层获得GaA/GaAlAs外延层薄膜的二次腐蚀技术。最终选用了C3H4(OH)(COOH)3.H2O-H2O2系选择性腐蚀液和H2SO4-H2O2系腐蚀液,获得了快速,可控制,重复性好的可全部可局部去除衬底的腐蚀方法。 相似文献
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高清晰度电视图象处理显示系统电子部第三研究所陈堤HDTV技术研究项目中有MPEG-2图象压缩方案研究和不同的信道编码(32QAM,VSB,COFDM)的研究,主要目标是:1)提供一套HDTV图象处理显示系统,显示HDTV活动图象序列。2)凡进行HDT... 相似文献
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GaAs、GaP、InP、InGaAsP、AlGaAs、InAlGaAs的化学腐蚀研究 总被引:2,自引:0,他引:2
许兆鹏 《固体电子学研究与进展》1996,16(1):56-63
为研制全集成光开关、微片式激光器等,对GaAs、GaP、InGaAsP、InAIGaAs、AlGaAs等材料的化学腐蚀进行了实验研究。为了研制InAlGaAs/InAlAs/InAlGaAs微片式激光器,开发了H3PO4/H2O2/H2O薄层腐蚀液和HCl/H2O选择性腐蚀液;为了研制InGaAsP/InP/InGaAsPTbar型光波导,开发了HCl/H3PO4/H2O2薄层腐蚀液和HCl/H2O2选择性腐蚀液;为了研制GaP、InGaP光波导,开发了HCl/HNO3/H2O薄层腐蚀液。它们都具有稳定、重复性好、速率可控、腐蚀后表面形貌好等特点。除此之外,蚀刻成的GaP光波导侧壁平滑无波纹起伏。此种结果尚未见报导。 相似文献
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采用PECVD技术在P型硅衬底上制备了a-SiOx:H/a-SiOy:H多层薄膜,利用AES和TEM技术研究了这种薄膜微结构的退火行为,结果表明:a-SiOxL:H/a-SiOy:H多层薄膜经退火处理形成nc-Si/SiO2多层量子点复合膜,膜层具有清晰完整的结构界面,纳米硅嵌埋颗粒呈多晶结构,颗粒大小随退火温度升高而增大小随退火温度升高而增大,在一定的实验条件下,样品在650℃下退火可形成尺寸大 相似文献
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GaAs(100)表面钝化和Mg/S/GaAs界面的SRPES研究 总被引:1,自引:1,他引:0
应用同步辐射光电子谱(SRPES)表征了一种新的CH3CSNH2/NH4OH溶液体系处理的GaAs(100)表面的成键特性和电子态.结果表明,经过处理的GaAs(100)表面,S既与As成键也与Ga成键,形成了S与GaAs的新界面,这说明CH3CSNH2/NH4OH溶液处理的GaAs(100)表面具有明显的钝化作用.钝化表面退火处理后,发现AS的硫化物不稳定,分解或反应生成Ga-S成分和元素态As;室温下,Mg淀积硫钝化的GaAs表面的实验结果表明,Mg置换GaS的Ga成为金属Ga偏析到表面,而硫以MgS 相似文献
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利用叔丁砷化氢(TBA)和叔丁磷化氢(TBP)的MOVPE已制成低阈值1.3μm的InGaAsP多量子阱(MQW)激光器。实验证明:与用常规的氢化物HsH3和PH3生长的四元InGaAsP材料相比,用TBA和TBP进行的四元材料生长可改善V族组分的可控性。从而使2英寸的InGaAsP MQW晶片的光致发光(PL)波长具有极好的均匀性,其标准偏差仅2.6nm,4.2K时,PL的最大半值全宽(FWHM 相似文献
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Sh S Tazhibaev E G Lenskaia K Kh Khasenova N M Karsybekova N R Alekseeva 《Eksperimental?nai?a onkologii?a》1989,11(4):66-70
The influence of carminomycin (CM) on enzymic systems of metabolism of oxygen active forms, free radical lipid peroxidation and microviscosity of membrane lipids as well as toxic and antitumour action of CM were studied in normal and tumour-bearing rats. Detected responses of the system of superoxide anion- and H2O2 metabolism reflected the role of active oxygen forms in CM toxicity. The investigation results of the lipid peroxidation fluorescent products level and microsomal lipid phase microviscosity did not suppose stimulation of lipid peroxidation as key mechanism for CM toxic effects. Problems on the prevention and treatment of anthracyclines side effects are discussed. 相似文献
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K Hirai J Pan H Shimada T Izuhara T Kurihara K Moriguchi 《Journal of electron microscopy》1999,48(3):289-296
The generation of oxygen free radicals was investigated using cytochemistry and its energy-filtering transmission electron microscopy in reference to the toxic mediator for the herbicide paraquat. When isolated intact mitochondria from rat livers were incubated in a medium containing paraquat and NADH, a mitochondrial NADH-quinone oxidoreductase activity generated superoxide anions to cause the destruction of mitochondria which resulted in cell death. The superoxide anions were immediately converted into hydrogen peroxide, which then formed cerium perhydroxide deposits in the presence of cerium ions and precipitated on the outer surface of the mitochondrial outer membrane. This localization was also specifically identified by energy spectral imaging and image-electron energy loss spectral analyses. Precipitation reaction was scavenged by the addition of either cytochrome c or catalase and inhibited by dicoumarol (an inhibitor of NAD(P)H-quinone oxidoreductases). These cytochemical energy-filtering transmission electron microscopic results indicated that paraquat generated free radicals from the outer membrane of mitochondria. 相似文献
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低功率激光对细胞质膜通透性及细胞功能的影响 总被引:4,自引:0,他引:4
目的:探索低功率激光对细胞质膜通透性及细胞功能的影响。方法:以波长为632.8nm,功率密度为5.4mW/cm~2的氦氖激光照射人外周血淋巴细胞15、30、60分钟,并采用钙荧光指示剂Fura—2/Am定量测试法检测淋巴细胞内游离钙浓度和质膜Ca~(2+)—Mg~(2+)—ATP酶活性变化。结果:照射后淋巴细胞内游离钙浓度明显低于正常(P<0.05);同时细胞膜Ca~(2+)—Mg~(2+)—ATP酶活性增加(P<0.05);而且照射后细胞内游离钙浓度降低与质膜上Ca~(2+)—Mg~(2+)—ATP酶的激活呈负相关。结论:低功率激光照射激活细胞膜Ca~(2+)—Mg~(2+)—ATP酶活性,使细胞膜对钙通透性发生变化,且影响到细胞内Ca~(2+)贮存,造成细胞膜通透性和细胞功能的改变。 相似文献
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A D Durnev T B Suslova Z P Cheremisina O Iu Dubovskaia E A Nigarova L G Korkina S B Seredenin B T Velichkovski? 《Eksperimental?nai?a onkologii?a》1990,12(2):21-24
The cell chemiluminescence method was used to demonstrate the ability of asbest and zeolite dusts from 8 deposits of the USSR to induce generation of free oxygen radicals in the phagocytosing cells suspension. It has been found that asbest and zeolite (0.01 and 0.05 mg/ml) increase levels of cells with chromosome aberrations in human cell cultures. The cytogenetic effect of asbest was inhibited by superoxide dismutase (50 mg/ml). The damaging effect of zeolite was decreased by the pharmacological drug bemithyl (0.007-0.07 mM) and completely eliminated by catalase (20 mg/ml). The results obtained indicate that mutagenic effect of dust particles of asbest and zeolite is mediated by oxygen radicals. 相似文献
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本文应用电子显微镜研究了PVA在H_2Q存在下的氧化降解机理,并对PVA降解前后的微观结构变化进行了观察。结果表明:高聚物PVA在有光敏剂(H_2Q)存在下,能引发PVA产生降解,其降解机理是按自由基连锁反应过程进行的,降解后的低聚合度PVA的微结构形态也与降解前不同。 相似文献
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La_2O_3-SnO_2材料乙醇气敏性能与催化活性间关系 总被引:1,自引:0,他引:1
通过测量La2O3-SnO2的气敏性能和催化活性,考察了La2O3对SnO2气敏性能和催化性能的影响,同时讨论了该材料对甲烷(CH4)和乙醇(C2H5OH)的灵敏度与其催化氧化反应间的关系。结果表明:300℃时,掺杂w(La2O3)为3%时,可使乙醇的转化率从84.5%提高到100%,对体积分数为1×10-4的乙醇的灵敏度由11.06提高到53.22。说明目标气体的反应活性越高,其灵敏度也越高。掺杂La2O3提高乙醇气体的灵敏度的原因是因为增加了SnO2表面乙醇反应中的耗氧率。 相似文献