An ordered anodic porous alumina membrane has been used as a lithographic mask of SF6 fast atom beam etching to generate 100 nm period antireflection structure on silicon substrate. The consists deep hexagonal grating with and aspect ratio 12, which is fine two-dimensional structure. In the wavelength region from 400 800 nm, reflectivity surface decreases around 40% less than 1.6%. measured results are explained well theoretical calculated basis rigorous coupled-wave analysis.

Abstract Recently, submicron textures have been researched and applied to multicrystalline silicon solar cells in order improve their optical performance. In this study, the antireflection light trapping effects of surface crystalline Si (c‐Si) were quantitatively investigated by numerical simulations based on Maxwell's equations with a simple two‐dimensional (2D) grating model. The calculated results showed that reflection loss can be effectively reduced using gratings appropriate aspect...

Spectral emittance and thermal stability of two-dimensional W gratings are investigated to obtain high-temperature resistive selective emitters. Numerical calculations based on rigorous coupled-wave analysis performed determine the structural profile with good spectral selectivity. According determined parameters, composed rectangular microcavities period 1.0 μm fabricated single crystalline polycrystalline substrates. The grating shows a strong emission peak which can be explained by...

The effect of front and rear texture thin-film microcrystalline silicon solar cells on light trapping is evaluated by characterizing cell specimens with both superstrate (p-i-n) substrate (n-i-p) configurations that have a variety surface morphologies including intentionally polished flat surfaces. It demonstrated the enhances absorption external quantum efficiency from visible region to near-infrared region, while increases these properties only at wavelengths longer than around 600 nm....

Periodically textured back reflectors with hexagonal dimple arrays are applied to thin-film microcrystalline silicon (μc-Si:H) solar cells. When the textures have a moderate aspect ratio, optimum period for obtaining high short circuit current density (JSC) is found be equal or slightly larger than cell thickness. If thickness exceeds texture period, surface tends flattened and texture-induced defects generated, which constrain improvement in JSC. Based on these findings, we fabricated...

All existing solar cell materials including hybrid perovskites show rather small absorption coefficient ( α ) of ≈10 4 cm −1 in the bandgap E g transition region. The weak band‐edge light is an essential problem, limiting conversion efficiency particularly a tandem cell. Herein, all distorted chalcogenide (BaZrS 3 , SrZrS BaHfS and SrHfS are found experimentally to exhibit extraordinary high exceeding 10 5 near indicating highest among known materials. giant region, which consistent with...

Hydrogenated amorphous silicon (a-Si:H) films, used for light absorbers of p-i-n solar cells, were deposited at various deposition rates (Rd) ranging over two orders magnitude (Rd ∼ 2 × 10−3–3 10−1 nm/s) by using diode and triode plasma-enhanced chemical vapor (PECVD). The impact varying Rd on the light-soaking stability cells has been investigated. Although a reduction mitigates light-induced degradation in typical range (>10−1 nm/s), it remains present even very low (<10−2...

We report a high-efficiency triple-junction thin-film silicon solar cell fabricated with the so-called substrate configuration. It was verified whether design criteria for developing single-junction microcrystalline (μc-Si:H) cells are applicable to multijunction cells. Furthermore, notably high short-circuit current density of 32.9 mA/cm2 achieved in μc-Si:H on periodically textured high-mobility front transparent contacting layer. These technologies were also combined into...

Two-dimensional surface-relief gratings with a period of 1.0–0.2μm composed rectangular microcavities were fabricated on single crystalline W substrates to develop spectrally selective radiators for thermophotovoltaic generation. The displayed strong emission in the near-infrared region where narrow-band-gap photovoltaic cells could convert photons into electricity. enhancement thermal was attributed microcavity effect. Power generation tests carried out and showed more than two times higher...

A simple fabrication technique for subwavelength structured (SWS) surfaces by means of anodic porous alumina masks directly formed on Si substrates was proposed and demonstrated. By this technique, SWS were fabricated polished single-crystalline chemically etched as-cut multicrystalline wafers. Smoothly tapered with a periodicity 100nm height 300–400nm obtained. low reflectivity below 1% observed from 300to1000nm both the wafers, in agreement numerical simulation. After thermal annealing at...

In this article, the light-trapping effect of textured back surface reflectors in thin-film Si solar cells is investigated. A unique substrate with a periodic dimple pattern has been developed by utilizing anodic oxidation Al as self-ordering process. n-i-p hydrogenated microcrystalline (μc-Si:H) fabricated on period 0.9 μm show an improved infrared response compared to those randomly substrates. high short circuit current density 24.3 mA/cm2 achieved 1-μm-thick μc-Si:H cell adopting...

We report on a high-efficiency triple-junction thin-film silicon solar cell fabricated using the substrate configuration. An undoped hydrogenated amorphous (a-Si:H) grown triode plasma-enhanced chemical vapor deposition, which is more stable against light soaking, was applied to a-Si:H/μc-Si:H/μc-Si:H cells with honeycomb-textured substrates. To find best balance in short circuit density and fill factor, we quantitatively investigated effect of current mismatch cells. Accordingly, stabilized...

In this paper, we present our latest results toward high-efficiency thin-film silicon solar cells. Owing to the superior light trapping capability of periodic textures combined with other technologies, a new world record was achieved for efficiency single-junction microcrystalline cells, conversion 11.0%, independently confirmed by Advanced Industrial Science and Technology (AIST) Characterization, Standards, Measurement (CSM) team.

The potential of high-rate growth high-quality microcrystalline silicon (µc-Si:H) films for solar cell applications is investigated by very high frequency plasma-enhanced chemical vapor deposition (VHF-PECVD) under a high-pressure SiH4 depletion condition. It found that the morphology textured substrates plays an important role in not only light trapping but also µc-Si:H film growth. A conversion efficiency 11.1% attained substrate-type on substrate with honeycomb textures, which has rounded...

We report that thin-film silicon solar cells exhibiting high stabilized efficiencies can be obtained by depositing hydrogenated amorphous (a-Si:H) absorbers using triode-type plasma-enhanced chemical vapor deposition. The improved light-soaking stability and performance of are also realized optimizing the device design, such as p p–i buffer layers. As a result, we attain independently confirmed 10.1–10.2% for a-Si:H single-junction (absorber thickness: ti = 220–310 nm) 12.69% an (ti 350...

The impact of intrinsic amorphous silicon bilayers in silicon/crystalline (a-Si:H/c-Si) heterojunction solar cells is investigated. microstructure factor R* the interfacial a-Si:H layer, which related to Si-H bond and determined by infrared absorption spectroscopy, controlled a wide range varying growth pressure power density plasma-enhanced chemical vapor deposition process. Surface passivation at a-Si:H/c-Si interface significantly improved using an bilayer, i.e., stack layer with large...

Abstract Thin crystalline silicon (c‐Si) solar cells are highly attractive for realizing light‐weight and flexible wafer‐based as well reducing the material cost. Silicon heterojunction (SHJ) architecture using hydrogenated amorphous (a‐Si:H) is suitable very thin c‐Si cells, because of its capability excellent surface passivation. In this work, potential examined by characterizing SHJ with a wide range thicknesses from 50 to 400 μm. A trade‐off between open‐circuit voltage (V OC ) short...

The angle-dependent reflectivity of several surface structures was analyzed and evaluated with the viewpoint solar cell applications. Numerical analysis showed that a Si subwavelength structure (SWS) maintains lower at large incident angles than conventional light-trapping techniques such as random pyramid texture, it can contribute to increasing output power cells under oblique irradiation. This wide-angle antireflection effect demonstrated by fabricating test crystalline including SWS...

Light trapping is a key issue to boost the efficiency of thin-film Si solar cells including μc-Si:H. In this work, effect textured back reflectors on light in μc-Si:H has been investigated with self-orderly patterned Al substrates obtained by anodic oxidation. By increasing period from 0 1.1 μm, short circuit current densities 1-μm-thick significantly increase 18 over 24 mA/cm2, which attributed improved near infrared region. The optimum for determined be around 1 μm cells. addition, it...

Surface texturing is a technique commonly used to enhance light absorption in thin film silicon solar cells; it should be noted that highly textured substrates often induce structural defects the active layer, which deteriorates photovoltaic performance. In this paper, we propose flattened light-scattering substrate (FLiSS) with large refractive index contrast plane as an approach overcome trade-off. A FLiSS composed of two-dimensional ZnO grating and Ag reflector applied μc-Si:H cells,...

ABSTRACT Hydrogenated amorphous silicon (a‐Si : H) films are prepared by plasma‐enhanced chemical vapor deposition (PECVD) with a triode electrode configuration in which SiH 4 –H 2 glow‐discharge plasma is confined spatially away from the substrate. Although rate (0.1–0.5 Å/s) lower than that of conventional diode PECVD process (2.5 Å/s), light‐induced degradation conversion efficiency (Δ η / ini ) single‐junction solar cell substantially reduced (e.g., Δ ~ 10% at an absorber thickness t i =...

We developed advanced light management techniques and applied them to single-junction microcrystalline silicon solar cells improve their current density conversion efficiency. A high short-circuit of 30.8 mA/cm2 is attained in a 3-µm-thick cell aided by the superior light-trapping effect periodically textured back reflectors, reduced absorption loss from high-mobility transparent conductive oxide films. In addition, an unprecedented efficiency 10.5% independently confirmed 1.8-µm-thick with...

Abstract Dielectric films with anti‐reflective sub‐wavelength structures are applied to thin‐film silicon solar cells improve the light incoupling at front surface. It is verified that modification of refractive index incident medium using dielectric beneficial reduce average reflectivity Si an coating based on optical interference. also shown structure must be combined a proper light‐trapping texture enhance absorption within cells. The effectiveness demonstrated by increase short‐circuit...