Increased Light Extraction From GaN Light-Emitting Diodes by ${\rm SiN}_{{\rm x}}$ Compound Eyes

Kang, Eun Kyu; Song, Young Min; Jang, Sung Jun; Yeo, Chan Il; Lee, Yong Tak

doi:10.1109/lpt.2013.2260324

Cited by 11 publications

(10 citation statements)

References 26 publications

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“…As the simulated result in Table , the SWSs with the period of 200 and 300 nm show the high average transmittance (T avg ) of 94.19 and 93.86%, respectively, in the wavelength range of 300–1880 nm. The period of less than 200 nm has been designed for effective SWSs, which reduce light scattering in the short wavelength region . Meanwhile, Boden et al have calculated that optimum period of antireflective nanostructure at interface between EVA‐silicon layers is under 300 nm .…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Highly Transparent and Cost‐Effective Soda Lime Glass with Antireflective Nanostructures Using Silver Ink

Kwon

Lee

Hwang

et al. 2018

Physica Status Solidi (a)

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Highly transparent single-side subwavelength structures (SWSs)-integrated glass for low-cost antireflective glass are fabricated. Using the silver ink and a RIE process, various SWSs on soda lime glass are fabricated simply and cost-effectively. The fabricated SWSs have different distributions and shapes as the silver ink ratio. The average transmittance (T avg ), solar-weighted transmittance (SWT), and angle-dependent transmittance values of bare and SWSs-integrated glasses for investigation of optical properties are measured. The SWSs sample with a silver ink ratio of 33% exhibited good T avg and SWT compared to the samples with silver ink ratios of 25 and 50%. This shows that the T avg and SWT values can be attained with the soda lime glass are higher compared to those attained using bare glass, over a broad spectral range and a wide incident angle range. As results, optical properties of glass and the performance of photovoltaic (PV) modules can be enhanced by integrating SWSs. The fabricated SWSs-integrated glass is mounted on the top of PV modules for economical coverglass. The PV module with the SWSs-integrated coverglass shows efficiency of 36.6% and the enhanced efficiency at all angle of incidence compared to that without coverglass. It indicates that the highly transparent glasses with SWSs can be used for lowcost antireflective glasses such as large-scale framed glasses for pictures, optical lens, displays, LEDs, and other optoelectronic devices as well as PV modules.

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Section: Resultsmentioning

confidence: 99%

Fabrication of Highly Transparent and Cost‐Effective Soda Lime Glass with Antireflective Nanostructures Using Silver Ink

Kwon

Lee

Hwang

et al. 2018

Physica Status Solidi (a)

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“…126 GaN-based LEDs with articial compound eye structures using SiN x , consisting of microlens arrays and antireective SWSs, exhibited a light extract efficiency enhancement of 93%, compared to convent ional GaN LEDs with a at surface. 127 Besides, silica cone arrays directly etched on the opposite side of an ITO coated fused silica substrate can dramatically reduce the reection loss of the white organic light-emitting devices, resulting in a luminance efficiency increase by a factor of 1.4 compared to that of the device using a at silica substrate. 128 Recently, Ho et al fabricated polycarbonate nanostructure lms nanoimprinted by density-graded nanoporous silicon, which reduce the reectivity from 10.2% to 4.8% in the visible wavelength region (Fig.…”

Section: Light Emitting Diodesmentioning

confidence: 99%

Recent advances in antireflective surfaces based on nanostructure arrays

2015

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Reducing the reflection and improving the transmission or absorption of light from wide angles of incidence in a broad wavelength range are crucial for enhancing the performance of the optical, optoelectronic, and electro-optical devices. Inspired by the structures of the insect compound eyes, nanostructure arrays (NSAs) have been developed as effective antireflective surfaces, which exhibit promising broadband and quasi-omnidirectional antireflective properties together with multifunctions. This review summarizes the recent advances in the fabrication and performance of antireflective surfaces based on NSAs of a wide variety of materials including silicon and non-silicon materials. The applications of the NSA-based antireflective surfaces in solar cells, light emitting diodes, detection, and imaging are highlighted. The remaining challenges along with future trends in NSA-based antireflective surfaces are also discussed.

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“…Ray-tracing and a RCWA method were used to obtain the desirable micro-and nanostructures because of the limited time and resources available for each simulation tool [21]. To determine a desirable microstructure, a semicylinder (SC) array and a PSMS array with 20-μm width and 10-μm height were considered.…”

Section: A Optical Simulations and Fabricationsmentioning

confidence: 99%

“…As The simply fabricated HSC has two functions: the PSMSs can effectively refract light due to their geometrical shape, and the SWSs also reduce light reflection by acting as a refractive index matching layer at the interface between air (n = 1.00) and coverglass (n = 1.47) [20]. Before fabricating the HSC, theoretical calculations based on ray-tracing [21] and rigorous coupled-wave analysis (RCWA) method [22] was utilized as guidance for determining the geometrical effect of the PSMSs and SWSs, respectively. The optical properties of the HSC were investigated by transmittance spectra measurement and were confirmed by the characterization of the coverglass mounted solar cells.…”

Section: Introductionmentioning

confidence: 99%

Improved Light Absorption of GaInP/GaAs/Ge Solar Cell Modules With Micro/Nanoengineered Coverglasses

Kang

Yeo

Kang

et al. 2015

IEEE J. Photovoltaics

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We report on advanced types of coverglasses, which include the hierarchical micro-and subwavelength-structured surfaces for improved absorption efficiency of photovoltaic modules. Prism-shaped microstructures (PSMSs) help eliminate the optical shading caused by the metal grid of solar cells. The subwavelength structures (SWSs) with a tapered shape behave as a refractive index matching layer to reduce the surface reflection at the interface of air and coverglass. The geometries of the PSMSs and SWSs were designed by ray-tracing and the rigorous coupled-wave analysis method simulations, respectively, which provided the design guidelines. The PSMSs and SWSs were fabricated by a simple two-step process consisting of an isotropic wet etching process with hydrofluoric acid solution using a SiN x mask and a self-masked dry etching process, respectively. A hybrid patterned coverglass incorporating the PSMSs with SWSs were mounted on GaInP/(In)GaAs/Ge triple-junction solar cells with a precise alignment process. The measured power conversion efficiency of the subreceiver module with the patterned glass reached 32.97% for 1 sun, which is 11.19% higher compared with a subreceiver module with a flat coverglass.

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Increased Light Extraction From GaN Light-Emitting Diodes by ${\rm SiN}_{{\rm x}}$ Compound Eyes

Cited by 11 publications

References 26 publications

Fabrication of Highly Transparent and Cost‐Effective Soda Lime Glass with Antireflective Nanostructures Using Silver Ink

Fabrication of Highly Transparent and Cost‐Effective Soda Lime Glass with Antireflective Nanostructures Using Silver Ink

Recent advances in antireflective surfaces based on nanostructure arrays

Improved Light Absorption of GaInP/GaAs/Ge Solar Cell Modules With Micro/Nanoengineered Coverglasses

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