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应用计算机数值模拟方法计算p+(μc-Si:H)/n(c-Si)及p+(μc-Si:H)/i(a-Si:H)/n(c-Si)异质结太阳能电池中的电场强度分布,说明μc-Si/c-Si异质结电池制造中μc-Si:H膜厚选择,进而对嵌入a-Si:H薄层的μc-Si/c-Si异质结太阳能电池设计进行分析,包括a-Si:H薄层p型掺杂效应及本底单晶硅的电阻率选择,最后讨论μc-Si/c-Si异质结太阳能电池稳定性. 相似文献
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采用高压高功率的超高频等离子体增强化学气相沉积(VHF-PECVD)技术,在腐蚀后的7059玻璃、低晶化和高晶化的微晶硅(μc-Si:H)p型材料3种衬底上,通过改变沉积时间的方法,高速(沉积速率约为1 nm/s)沉积了不同厚度的μc-Si:H薄膜材料.测试其表面形貌及晶化率,比较了不同衬底上高速生长的μc-Si:H薄膜生长机制及微结构的差异,最后得到适于高速沉积pin μc-Si:H太阳电池的μc-Si:H p型材料应具备的条件. 相似文献
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本文介绍了 C_yF_(14)+ O_2等离子刻蚀 a=Si:H/a-C:H 超晶格的工艺原理及方法,简便可行. 相似文献
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Julia P Ostertag Ingo B Ramsteiner Oliver Schmidt Christian Wachtendorf Rudolf Brüggemann 《Progress in Photovoltaics: Research and Applications》2015,23(1):94-105
Optical and electrical simulations were carried out for thin film silicon solar tandem cells with intermediate reflector layer (IRL) between top and bottom cell and compared with experimental external quantum efficiency and current voltage characteristics results. Reference data were collected from a series of tandem cells with different thicknesses of the top cell absorber layer (160–240 nm), the bottom cell absorber layer (1750–2100 nm), and the transparent conductive oxides based IRL (10–80 nm). It turned out that for capturing correctly the influence of the IRL on the light management as a function of the IRL thickness, the conventional semicoherent approach is not sufficient. Whereas the optical properties of a very thin IRL are governed by interference effects that are best calculated using a fully coherent model, increasingly thicker IRL show a more and more incoherent behavior. By taking into account, the interface morphology and angular light distribution within the cell stack an algorithm for the effective IRL reflectivity was proposed that explains the experimental findings very well. The consecutive electrical simulations were carried out with the device simulator ASA. The dependence of short circuit current density jsc and fill factor FF on the thickness dIRL of the IRL is in qualitative agreement between simulation and experiment showing coincident extrema in jsc(dIRL) and FF(dIRL) at the current matching point. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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Wide band gap and highly conducting n-type nano-crystalline silicon film can have multiple roles in thin film solar cell. We prepared phosphorus doped micro-crystalline silicon oxide films (n-μc-SiO:H) of varying crystalline volume fraction (Xc) and applied some of the selected films in device fabrication, so that it plays the roles of n-layer and back reflector in p-i-n type solar cells. It is generally understood that a higher hydrogen dilution is needed to prepare micro-crystalline silicon, but in case of the n-μc-SiO:H an optimized hydrogen dilution was found suitable for higher Xc. Observed Xc of these films mostly decreased with increased plasma power (for pressure<2.0 Torr), increased gas pressure, flow rate of oxygen source gas and flow rates of PH3>0.08 sccm. In order to determine deposition conditions for optimized opto-electronic and structural characteristics of the n-μc-SiO:H film, the gas flow rates, plasma power, deposition pressure and substrate temperature were varied. In these films, the Xc, dark conductivity (σd) and activation energy (Ea) remained within the range of 0–50%, 3.5×10−10 S/cm to 9.1 S/cm and 0.71 eV to 0.02 eV, respectively. Low power (30 W) and optimized flow rates of H2 (500 sccm), CO2 (5 sccm), PH3 (0.08 sccm) showed the best properties of the n-μc-SiO:H layers and an improved performance of a solar cell. The photovoltaic parameters of one of the cells were as follows, open circuit voltage (Voc), short circuit current density (Jsc), fill-factor (FF), and photovoltaic conversion efficiency (η) were 950 mV, 15 mA/cm2, 64.5% and 9.2% respectively. 相似文献
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In this study, we report an appreciably increased efficiency from 6% up to 9.1% of hydrogenated amorphous silicon germanium (a-SiGe:H) thin film solar cells by using a combination of different p-doped window layers, such as boron doped hydrogenated amorphous silicon (p-a-Si:H), amorphous silicon oxide (p-a-SiOx:H), microcrystalline silicon (p-µc-Si:H), and microcrystalline silicon oxide (p-µc-SiOx:H). Optoelectronic properties and the role of these p-layers in the enhancement of a-SiGe:H cell efficiency were also examined and discussed. An improvement of 1.62 mA/cm2 in the short-circuit current density (Jsc) is attributed to the higher band gap of p-type silicon oxide layers. In addition, an increase in open-circuit voltage (Voc) by 150 mV and fill factor (FF) by 6.93% is ascribed to significantly improved front TCO/p-layer interface contact. 相似文献
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Guangtao Yang Ren A. C. M. M. van Swaaij Olindo Isabella Miro Zeman 《Progress in Photovoltaics: Research and Applications》2015,23(10):1283-1290
In this paper, we present a novel way of texturing glass facilitated by ZnO:Al thin film as sacrificial layer for thin film silicon solar cell application. We name this technique zinc oxide‐induced texturing (ZIT). The texturing of glass was achieved by wet etching of ZnO:Al covered glass with HF and HNO3 as etchants. We investigated the influence of the ZnO:Al layer sputtering condition, the layer thickness, and the etchant composition on the surface morphology of the textured glass. We demonstrate that we are able to control the roughness of the ZIT glass over a wide roughness range, ranging from 20 to 400 nm. Highly efficient microcrystalline silicon n‐i‐p solar cells were deposited on ZIT glass. The influence of the substrate morphology on the solar cell performance is also discussed. The highest efficiency for a single junction n‐i‐p microcrystalline silicon solar cell obtained in this work is 10.64% (Active area). Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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PI衬底柔性透明硅薄膜太阳能电池的制备及性能 总被引:1,自引:1,他引:0
利用硬质玻璃为载板,采用传统硅薄膜太阳能电池生产设备,在聚酰亚胺(PI)塑料薄膜衬底上沉积了B掺杂的ZnO(BZO)薄膜,并以此作为前电极制备了单节电池结构及多节串联一体结构的非晶硅(a-Si)太阳能电池;研究了PI衬底上BZO薄膜的光学及电学性能。结果表明,PI衬底上沉积BZO薄膜后在300~1 200 nm波长范围的透光率为76.63%,方块电阻19.7?/□。所制备的单节和多节串联一体结构的a-Si薄膜太阳能电池的转化效率分别达到6.45%和5.1%,封装后电池组件具有一定的透光性,透光率约达到30.2%。 相似文献
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C. Eminian F.‐J. Haug O. Cubero X. Niquille C. Ballif 《Progress in Photovoltaics: Research and Applications》2011,19(3):260-265
Silver nanoparticles embedded in a dielectric material have strong scattering properties under light illumination, due to localized surface plasmons. This effect is a potential way to achieve light trapping in thin‐film solar cells. In this paper we study light scattering properties of nanoparticles on glass and ZnO, and on silver coated with ZnO, which represent the back reflector of a solar cell. We find that large nanoparticles embedded in the dielectric at the back contact of amorphous silicon solar cells lead to a remarkable increase in short circuit current of 20% compared to co‐deposited cells without nanoparticles. This increase is strongly correlated with the enhanced cell absorption in the long wavelengths and is attributed to localized surface plasmons. We also discuss the electrical properties of the cells. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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T. Sderstrm F.‐J. Haug X. Niquille C. Ballif 《Progress in Photovoltaics: Research and Applications》2009,17(3):165-176
Substrate configuration allows for the deposition of thin film silicon (Si) solar cells on non‐transparent substrates such as plastic sheets or metallic foils. In this work, we develop processes compatible with low Tg plastics. The amorphous Si (a‐Si:H) and microcrystalline Si (µc‐Si:H) films are deposited by plasma enhanced chemical vapour deposition, at very high excitation frequencies (VHF‐PECVD). We investigate the optical behaviour of single and triple junction devices prepared with different back and front contacts. The back contact consists either of a 2D periodic grid with moderate slope, or of low pressure CVD (LP‐CVD) ZnO with random pyramids of various sizes. The front contacts are either a 70 nm thick, nominally flat ITO or a rough 2 µm thick LP‐CVD ZnO. We observe that, for a‐Si:H, the cell performance depends critically on the combination of thin flat or thick rough front TCOs and the back contact. Indeed, for a‐Si:H, a thick LP‐CVD ZnO front contact provides more light trapping on the 2D periodic substrate. Then, we investigate the influence of the thick and thin TCOs in conjunction with thick absorbers (µc‐Si:H). Because of the different nature of the optical systems (thick against thin absorber layer), the antireflection effect of ITO becomes more effective and the structure with the flat TCO provides as much light trapping as the rough LP‐CVD ZnO. Finally, the conformality of the layers is investigated and guidelines are given to understand the effectiveness of the light trapping in devices deposited on periodic gratings. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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Daniel Inns Lei Shi Armin G. Aberle 《Progress in Photovoltaics: Research and Applications》2008,16(3):187-194
In this paper, fabrication of a non‐continuous silicon dioxide layer from a silica nanosphere solution followed by the deposition of an aluminium film is shown to be a low‐cost, low‐thermal‐budget method of forming a high‐quality back surface reflector (BSR) on crystalline silicon (c‐Si) thin‐film solar cells. The silica nanosphere layer has randomly spaced openings which can be used for metal‐silicon contact areas. Using glass/SiN/p+nn+ c‐Si thin‐film solar cells on glass as test vehicle, the internal quantum efficiency (IQE) at long wavelengths (>900 nm) is experimentally demonstrated to more than double by the implementation of this BSR, compared to the baseline case of a full‐area Al film as BSR. The improved optical performance of the silica nanosphere/aluminium BSR is due to reduced parasitic absorption in the Al film. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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Light trapping is one of the key issues to improve the light absorption and increase the efficiency of thin film solar cells. The effects of the triangular Ag nanograting on the absorption of amorphous silicon solar cells were investigated by a numerical simulation based on the finite element method. The light absorption under different angle and area of the grating has been calculated. Furthermore, the light absorption with different incident angle has been calculated. The optimization results show that the absorption of the solar cell with triangular Ag nanograting structure and anti-reflection film is enhanced up to 96% under AM1.5 illumination in the 300–800 nm wavelength range compared with the reference cell. The physical mechanisms of absorption enhancement in different wavelength range have been discussed. Furthermore, the solar cell with the Ag nanograting is much less sensitive to the angle of incident light. These results are promising for the design of amorphous silicon thin film solar cells with enhanced performance. 相似文献