共查询到20条相似文献,搜索用时 31 毫秒
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本文从磷掺杂对价带顶上隙态和导带带尾分布的影响,讨论了掺杂对非晶硅隙态的影响。轻掺杂使带隙深处态密度增加;重掺杂还加宽了价带带尾。掺杂对导带带尾影响不明显,掺杂造成光隙的减少是由于价带带尾单方面变动造成的。 相似文献
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采用射频等离子体增强化学气相沉积(RF-PECVD)方法,在不同CO_2与硅烷气体流量比(R_C=[CO_2]/[SiH_4]=0.0、0.5、1.0、2.0)、衬底温度(T_S=200℃)、乙硼烷掺杂浓度(R_B=[B_2H_6]/[SiH_4]=1.5%)、高氢稀释比(R_H=[H2]/[SiH_4]=200)、高气压(220 Pa)和高功率密度(1 W·cm~(-2))条件下制备一系列氢化非晶硅氧(a-SiO_x∶H)薄膜。通过分光光度计(UV-VIS)透射谱分析薄膜折射率n、光学带隙E_g与R_C的关系;采用绝缘电阻测试仪进行变温暗电导测试,分析讨论暗电导σ_d、激活能E_a与R_C的关系;运用傅里叶变换红外光谱(FTIR)对薄膜的键合模式及薄膜中氧、氢含量进行分析表征。结果显示,随R_C增加,薄膜光学带隙展宽,折射率减小,激活能E_a增大,费米能级向导带底移动,薄膜缺陷增多。 相似文献
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Kaining Ding Thomas Kirchartz Bart E. PietersCarolin Ulbrich Alexander M. ErmesSandra Schicho Andreas LambertzReinhard Carius Uwe Rau 《Solar Energy Materials & Solar Cells》2011,95(12):3318-3327
We simulated device characteristics of a-Si:H single junction, μc-Si:H single junction and a-Si:H/μc-Si:H tandem solar cells with the numerical device simulator Advanced Semiconductor Analysis (ASA). For this purpose we measured and adjusted electrical and optical input parameters by comparing measured and simulated external quantum efficiency, current−voltage characteristic and reflectivity spectra. Consistent reproducibility of experimental data by numerical simulation was achieved for all types of cells investigated in this work. We also show good correspondence between the experimental and simulated characteristics for a-Si:H/μc-Si:H tandem solar cells with various absorber thicknesses on both Asahi U-type SnO2:F and sputtered/etched (Jülich) ZnO:Al substrates. Based on this good correlation between experiment and theory, we provide insight into device properties that are not directly measurable like the spatially resolved absorptance and the voltage-dependent carrier collection. These data reveal that the difference between tandem solar cells grown on Asahi U-type and Jülich ZnO substrates primarily arises from their optical properties. In addition, we find out that the doped layers do not contribute to the photocurrent except for the front p-layer. We also calculated the initial efficiencies of a-Si:H/μc-Si:H tandem solar cells with different combinations of a-Si:H and μc-Si:H absorber layer thicknesses. The maximum efficiency is found at 260 nm/1500 nm for tandem solar cells on Asahi U-type substrates and at 360 nm/850 nm for tandem solar cells on Jülich ZnO substrates. 相似文献
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400cm2 a-Si/a-Si叠层太阳电池的研究 总被引:6,自引:0,他引:6
以全部国产化装备和工业用原材料,以简单铝背电极制备出初始效率为8.28%,经室外阳光照射一年后稳定效率为7.35%,面积为20cm×20cm,有效面积为360cm2a-Si/a-Si叠层太阳电池。主要制备技术措施:(1)TCO/p界面接触特性的改善;(2)μc-SiC∶H/a-SiC∶H复合窗口层技术;(3)p/i界面H处理;(4)高质量本征a-Si∶H材料;(5)优良的n1/p2隧道结;(6)最佳电池结构设计等。 相似文献
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《Solar Cells》1979,1(1):91-98
It is now well established that the properties of hydrogenated amorphous silicon are highly dependent on the preparation conditions. In this paper we describe the Schottky barrier characteristics of cells incorporating a-SiH grown at different substrate temperatures and in various hydrogen partial pressures. The characteristics of the cells in the dark and under illumination are highly dependent on the type of the dominant conduction process. The illuminated cell characteristics are described for cells with efficiencies of 2%. The open-circuit voltage Voc and the short-circuit current Isc are shown to be temperature dependent and the dependence is more pronounced for non-optimum cells than for optimum devices. The spectral response for the cells is also described. 相似文献
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通过AFORS-HET软件模拟了TCO/a-Si:H(p)/a-Si:H(i)/c-Si(n)/a-Si:H(i)/a-Si:H(n)/Ag结构的硅异质结电池中硅衬底电阻率、本征非晶硅薄膜厚度、发射极材料特性以及TCO功函数对电池性能的影响。结果表明:在其它参数不变的条件下,硅衬底电阻率越低,转换效率越高;发射极非晶硅薄膜厚度对短路电流有较大影响,发射极掺杂浓度低于7.0×1019cm-3时,电池各项性能参数都极差;TCO薄膜功函数应大于5.2 eV,以保证载流子的输运收集。 相似文献
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气固两相旋流中气粒两相流场特性数值模拟 总被引:2,自引:1,他引:2
以气固旋流分离器为研究对象,对气相采用κ-ε模型及代数应力模型,对颗粒相应用随机轨道模型,并考虑相间耦合的相互作用,建立了描述气固两相旋流中气粒两相流场特性数学模型,同时,应用SIMPLEC方法,成功地进行了气固两相旋流听敢粒两相流场特性数值模拟。结果表明:在内锥体顶部上方易形成旋涡;分离器靠外壁处气流为上升流,且偏向出口;在分离器中心区域存在回流,越靠近底部,回流越明显;尘粒初始位置越靠近分离器入口断面底部与分离器外侧越易到达分离器底部;在相同初始条件下,较大粒径尘粒易于到达分离器底部,较小粒径尘粒则先向分离器底部运动,后又向分离器顶部运行,从而可能从分离器出口跑出,或在分离器中某一位置不停旋转。 相似文献
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系统研究了非晶硅本征层的沉积温度和激光刻线功率对薄膜电池组件性能的影响。各非晶硅薄膜(P层、I层和N层)采用等离子体增强化学气相沉积(PECVD)制备。I层的光学带隙随着沉积温度的升高而降低,同时也引起电池转换效率的变化。采用傅里叶红外分析检测I层的H含量及键合方式,H含量及键合方式的变化是引起光学带隙变化的根本原因。激光刻线的形貌采用光学显微镜作微观分析,而采用不同激光功率刻线后,薄膜电池的性能也有所差异,结果显示7.5μJ是最合适的功率。 相似文献
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