Microstructured surface design for omnidirectional antireflection coatings on solar cells

Zhou, Weidong; Tao, Meng; Chen, Li; Yang, Hongjun

doi:10.1063/1.2817470

Cited by 129 publications

(104 citation statements)

References 18 publications

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“…The same result was also obtained in other structures. 9,10 It is also worth mentioning that further reduction in reflection is feasible with optimized index engineering.…”

Section: 10mentioning

confidence: 99%

“…9,10 Due to the limitation of the experimental setup, we could not measure the reflectivity of amorphous silicon solar cells with omni-AR structure. In here, the simulation results for amorphous silicon solar cells with and without omni-AR structure are carried out to understand the optical performance of the spherical surface textures for AR application on the amorphous solar cells.…”

Section: 10mentioning

confidence: 99%

“…9,10 The omni-AR structure is formed by coating solar cells with a monolayer of microscale spherical dielectric particles, followed by a dielectric film with film thickness of less than the diameter of the spherical dielectric particles. The performance of the omni-AR structure can be controlled by tuning the size, shape, refractive index and packing density of the dielectric particles, and the thickness and the refractive index of the dielectric film.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a key issue toward increasing the efficiency of semiconductor-based solar cells is the methods to reduce the interfacial reflection in the wavelength regime of interest to solar cells. [1][2][3][4][5][6][7][8][9][10] A common method is a single-layer quarterwavelength antireflection ͑AR͒ coating, such as a silicon nitride film on silicon solar cells or a transparent conducting oxide film on thin-film solar cells. 8 However, this coating is effective only for a particular wavelength, not broad spectrum.…”

Section: Introductionmentioning

confidence: 99%

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Solution-processed omnidirectional antireflection coatings on amorphous silicon solar cells

Wang

Tummala

Chen

et al. 2009

Journal of Applied Physics

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Solution-processed spherical surface textures are demonstrated on commercial amorphous silicon solar cells. The texture is formed with a monolayer of silica microspheres by convective coating, followed by a spin-on-glass film. It is found that the spherical texture reduces the reflectivity of the cells in the wavelength regime of 400-1200 nm, thus broad spectrum. It is also found that the spherical texture improves the efficiency of the cells at various incident angles from surface normal to at least 60°. The improvement in efficiency increases at larger incident angles to as high as 12% relative improvement, demonstrating its omnidirectionality. Current-voltage characteristics show that the efficiency improvement with coating is largely due to the increased short circuit current, while the open-circuit voltage remains the same. Therefore the efficiency improvement is attributed to more light coupled into the cells. This omnidirectional surface texture offers an attractive solution for antireflection in both polycrystalline silicon and thin-film solar cells.

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“…The same result was also obtained in other structures. 9,10 It is also worth mentioning that further reduction in reflection is feasible with optimized index engineering.…”

Section: 10mentioning

confidence: 99%

Section: 10mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solution-processed omnidirectional antireflection coatings on amorphous silicon solar cells

Wang

Tummala

Chen

et al. 2009

Journal of Applied Physics

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“…High κ materials such as TiO 2 and ZnO have been used as AR coated films in Si thin film solar cells [6]-[8]. However, ZnO shows a photo induced variation of electrical properties under visible illumination [9].Multilayer AR coating with refractive index variation effectively enhances the solar cell efficiency [10], [11]. Precise control of the optical thickness of TSO films grown using PEALD will be useful for the light-capturing structure of thin film solar cells.…”

mentioning

confidence: 99%

Optical and Electrical Properties of Ti&lt;SUB&gt;x&lt;/SUB&gt;Si&lt;SUB&gt;1-x&lt;/SUB&gt;O&lt;SUB&gt;y&lt;/SUB&gt; Films

Lim¹,

Yun²,

Kim³

2009

ETRI J

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Manuscript received May 19, 2009; revised Sept. 29, 2009; accepted Oct. 9, 2009 I. IntroductionTiO 2 has attracted attention due to its high dielectric constant (κ) and high refractive index (n). However, TiO 2 has disadvantages of a high leakage current and a low crystallization temperature below 400°C [1]. One way of overcoming these problems is fabricating a mixture of TiO 2 and a low κ material, such as SiO 2 and Al 2 O 3 [2]. It is expected that a mixed material like Ti x Si 1-x O y (TSO) film will show improved leakage current and breakdown voltage. If the compositions of the mixture are controlled accurately, the dielectric constant and refractive index can be tailored, which will be useful in fabricating optical and electronic devices. Plasma-enhanced atomic layer deposition (PEALD) is a powerful method to deposit thin films with precise controls of the mixed material composition and film thickness [2], [3]. Tailoring the refractive index and film thickness provides many advantages, particularly in the fabrication of antireflection (AR) coating films used as solar cells. In the field of thin film solar cells, AR coating with the designed optical thickness (a product of refractive index and film thickness) is required to enhance solar cell efficiency [4], [5]. High κ materials such as TiO 2 and ZnO have been used as AR coated films in Si thin film solar cells [6]-[8]. However, ZnO shows a photo induced variation of electrical properties under visible illumination [9].Multilayer AR coating with refractive index variation effectively enhances the solar cell efficiency [10], [11]. Precise control of the optical thickness of TSO films grown using PEALD will be useful for the light-capturing structure of thin film solar cells.To secure a wide refractive index range, a low n material (such as SiO 2 and Al 2 O 3 ) and a high n material (such as TiO 2 ) should be selected to fabricate an AR coating for a thin film solar cell. In this study, 4 ], respectively. The formation of one cycle for SiO 2 is TEOS/source purge (SP)/O 2 gas (plasma)/reactant gas purge (RP), and that for TiO 2 is TTIP/SP/O 2 gas (plasma)/RP. The plasma power density was about 0.4 W/cm 2 , and the plasma was turned on only during the supply of O 2 reactant gas. The purging gas was Ar, and the reactant gases were O 2 +Ar. The formation of one cycle for the TSO film is N Ti subcycles of TiO 2 , and N Si subcycles of SiO 2 , which designates the cycle coordinates (N Ti , N Si ).For example, TSO (1, 2) designates one cycle of TiO 2 and two cycles of SiO 2 [13]. TSOs of (1, 2), (1, 1), (2, 1), and (3, 1) were fabricated; thus, the Ti content varied with the cycle coordinates. To obtain reflection spectra curves, TSO films were deposited on a p-type Si (100) wafer as shown in Fig. 1(a), and for I-V measurement, a metal/TSO/ITO/glass structure was fabricated as shown in Fig. 1(b). The I-V measurement was performed with a voltage mode, which means that voltages were supplied and then currents were measured. In addition, the I-V curves were measured ...

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Pyrrolidone and Caprolactam‐Based Materials in Adhesion Related Applications

Hood

Ananthraman²,

Musa

2021

Handbook of Pyrrolidone and Caprolactam Based Materials

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Adhesion is the process of attachment of substances due to the presence of intermolecular forces of attraction between them. Polyvinyl pyrrolidone (PVP) polymers have widespread use in the adhesive industry because of their favorable physicochemical properties. In an aqueous environment, the adhesive properties of pyrrolidone‐based materials are correlated to their polarities. Pressure sensitive adhesives (PSA) are an unusual class of adhesive polymers. A PSA composition should also exhibit high‐cohesive strength and elasticity. Lactam‐based vinyl monomers are widely employed in ultraviolet and electron beam curable adhesives commonly found in coatings, inks, optical materials, and packaging applications. Urea‐formaldehyde thermoset resins are one of the most important classes of adhesive resins for producing wood‐based panels. The adhesives were made by coaxial‐electrospinning of polycaprolactam as the core and PVP as the adhesive sheath. The resulting material was radiation‐crosslinked to yield matrices that were composed of fibrous layered materials.

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Microstructured surface design for omnidirectional antireflection coatings on solar cells

Cited by 129 publications

References 18 publications

Solution-processed omnidirectional antireflection coatings on amorphous silicon solar cells

Solution-processed omnidirectional antireflection coatings on amorphous silicon solar cells

Optical and Electrical Properties of Ti&lt;SUB&gt;x&lt;/SUB&gt;Si&lt;SUB&gt;1-x&lt;/SUB&gt;O&lt;SUB&gt;y&lt;/SUB&gt; Films

Pyrrolidone and Caprolactam‐Based Materials in Adhesion Related Applications

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Microstructured surface design for omnidirectional antireflection coatings on solar cells

Cited by 129 publications

References 18 publications

Solution-processed omnidirectional antireflection coatings on amorphous silicon solar cells

Solution-processed omnidirectional antireflection coatings on amorphous silicon solar cells

Optical and Electrical Properties of Ti&amp;lt;SUB&amp;gt;x&amp;lt;/SUB&amp;gt;Si&amp;lt;SUB&amp;gt;1-x&amp;lt;/SUB&amp;gt;O&amp;lt;SUB&amp;gt;y&amp;lt;/SUB&amp;gt; Films

Pyrrolidone and Caprolactam‐Based Materials in Adhesion Related Applications

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Optical and Electrical Properties of Ti<SUB>x</SUB>Si<SUB>1-x</SUB>O<SUB>y</SUB> Films