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The paper presents a complex process used for obtaining ZnO nanostructures for antireflective coatings. The process is suitable to silicone solar cells and can be used in order to increase their efficiency under low solar radiation, allowing the control of the morphological and optical properties of ZnO nanostructures deposited on glass through ZnO seed layer deposition process. During the research,...
Plasmonic effects in microcrystalline silicon thin-film solar cells with textured front contacts and back reflectors were investigated. Nanotexturing of the front contact of the thin film-solar cell leads to enhanced light trapping, while the nanotextured back reflector allows for the formation of localized plasmonic resonances, which partially contribute to light scattering and partially to optical...
A light trapping method is proposed making use of non-tracking concentrators taking into account the solar resource over an entire year. The maximum concentration achievable was calculated to be 4.6 for a PV cell embedded in glass. This method was applied to thin film solar cells, in particular aSi and CIGS solar cells. The aSi stack consisted of ZnO, aSi, and ZnO, while the CIGS stack consisted of...
We have systemically studied effect of n-SiOx:H layers with relatively high oxygen content on silicon-based solar cell performance for use as a multi-functional layer. Optimization of n-SiOx:H layers and their application to μc-Si:H single-junction and a-Si:H/μc-Si:H tandem solar cells have experimentally been conducted. The μc-Si:H single-junction solar cells with novel structure p-μc-SiO:H/ i-μc-Si:H/...
Transparent conducting oxides (TCOs) with qualitatively better resistance to humidity than ZnO, the traditional Cu(In,Ga)Se2 (CIGS) TCO, are needed to reduce the water-induced degradation of CIGS photovoltaics (PV). Amorphous In-Zn-O (a-IZO) is found both to act as a water vapor transport barrier and to be essentially inert in damp heat testing at 85°C, 85%RH (85/85). In particular, no significant...
The optical absorption of an ultra-thin active layer solar cell can be significantly increased by engineering properly both the in plane patterning of the active layer and the vertical stack. This structuration both controls incident light coupling into slow light modes of the photonic crystals and photon lifetime in the absorbing material. Numerical results on optical and electrical properties will...
In order to achieve a high efficient a-Si solar cell, the TCO (transparent conductive oxide) substrates are required to be a low sheet resistivity, a high transparency, and a textured surface with light trapping effect. Recently, a zinc oxide (ZnO) thin film attracts our attention as new coating material having a good transparent and conductive for TCO of solar cells1-2.
We demonstrate a practical optoelectronic application of of Er-doped ZnO nanorod arrays (NRAs) synthesized by hydrothermal method serving as an antireflection (AR) coating. Er-doped ZnO NRAs exhibits broadband AR characteristics for unpolarized, TE-polarized, and TM-polarized lights. Due to growth on any surface of devices/substrates with ease, broadband AR characteristics, Er-doped ZnO NRAs can benefit...
Two attributes of opaline photonic crystal (PC) back-reflectors optically coupled to thin semiconductor films contribute to enhanced optical absorption in the semiconductor. Namely, (i) the PC back-reflector behaves as a perfect mirror (PM), exhibiting complete reflection over stop-gap frequencies; and (ii) the PC-semiconductor film interface couples incident light into resonant states that propagate...
Silicon-based thin-film photovoltaics is on the way the overcome drawbacks such as high degradation and low efficiencies by applying novel multiple-junction solar cells consisting of amorphous and microcrystalline absorber layers. In order to produce reliable high-power low-cost solar modules the design of the back contact and back reflector is an important issue. In this paper, ersol Thin Film GmbH...
The present paper will give insight into amorphous silicon based photovoltaic thin film technology with a special focus on implementing LPCVD ZnO front contact. ersol Thin Film GmbH (ETF) evaluated amorphous silicon modules on growth-textured Zinc Oxide (ZnO) films. The process is based on substrate glasses with outer dimensions of 1100 × 1300 mm2. The use of growth-textured Zinc Oxide layers for...
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