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半导体材料的发展及现状 总被引:1,自引:1,他引:0
介绍了半导体材料近10年来的开发、研制状况及其在半导体器件和电路中的应用;对其中一些材料进行了分析比较;描述了半导体新型材料的发展前景。 相似文献
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太阳能光伏发电技术在建筑中的应用 总被引:1,自引:0,他引:1
本文阐述了太阳能光伏发电系统的基本组成及工作原理,提出了光伏发电系统与建筑一体化的概念,并分析了其发展优势。然后提出在九洲电气新建厂区建设太阳能光伏电站的设计构想,最后对此工程的发展前景进行了预测。 相似文献
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Unlike crystalline silicon, quasi-monocrystalline porous silicon (QMPS) layers have a top surface with small voids in the body. What is more pertinent to the present study is the fact that, at a given wavelength of interest for solar cells, these layers are often reported, in the literature, to have a higher absorption coefficient than crystalline silicon. The present study builds on existing literature, suggesting an analytical model that simulates the performance of an elementary thin QMPS (as an active layer) solar cell. Accordingly, the effects that the interface states located at the void-silicon interface and that the porosity of this material have on the cell parameters are investigated. Furthermore, the effects of the optimum base doping, QMPS thickness, and porosity on the photovoltaic parameters were taken into consideration. The results show that the optimum base doping depends on the QMPS thickness and porosity. For an 8 μm thickness, the film QMPS layer gives a 35.4 mA/cm2 for short-circuit current density, 15% for conversion efficiency, and 527 mV for open-circuit voltage when the value of the interface states is about 1012 cm−2 and the base doping is about 2×1018 cm−3 under AM 1.5 conditions. 相似文献
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在半导体材料的加工过程中,很多重要步骤都涉及到了化学作用,讨论了半导体材料加工过程中化学缓蚀、化学机械抛光和清洗步骤的化学作用原理,介绍了从化学角度分析和优化半导体加工工艺的观点。 相似文献
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A Schiff base ligand was employed to synthesise TiO2 nano-particles by a two-step sol–gel method. The effect of the ligand on purity, particle size, optical properties and photo-voltaic performance of dye-sensitised solar cells was investigated. Various concentrations of the ligand were applied and each sample was characterised. Changing the ligand content had an effective role on the optical and photo-voltaic properties of the final product. The obtained products were characterised through powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectra, energy-dispersive X-ray spectrometry and ultraviolet–visible spectroscopy. 相似文献
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在对器件结构中材料应力进行分析和测量的基础上,提出了控制和优化器件结构中材料应力的几种方法,包括合理选择工艺条件、采用多层复合膜技术、确定双层结构的最佳厚度值以及选择适当的材料种类等。实际应用结果表明,这些方法是有效的和可行的。 相似文献
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用 Schwarz-Christoffel变换法计算了质量迁移InGaAsP BH激光器中的结电压分布;分析了迁移层和有源层侧向厚度,上限制层空穴浓度和有源层注入电流对迁移层同质结漏电流的影响;并提出以过渡模式为界,区分A类和B类模式,从理论上比较全面地分析了五层对称平板波导的模式行为;指出降低阈值电流和保证单基横模工作这两方面对迁移层厚度有相反的要求,从而存在一定意义下的最佳迁移层厚度. 相似文献
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半导体工艺设备是集成电路发展的重要先决条件。集成电路工艺技术的改进提高和产品的更新换代都与工艺设备息息相关。如何发展我国的半导体工艺设备,促进集成电路产业的发展,是我们应当认真思考的一个问题。本文在简单回顾了我国半导体工艺设备的发展历程之后,论述了它的现状与面临的问题,并就今后的发展提出了几点具体意见。 相似文献