Millennium Communication Co.

Hsinchu, Taiwan

Millennium Communication Co.

Hsinchu, Taiwan
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Chen H.-C.,National Chiao Tung University | Lin C.-C.,National Chiao Tung University | Han H.-V.,National Chiao Tung University | Chen K.-J.,National Chiao Tung University | And 6 more authors.
Asia Communications and Photonics Conference, ACP | Year: 2012

This study demonstrates the high performance of GaAs solar cells with double-layer quantum dots carried by flexible PDMS film. Several parameters were enhanced. Different concentrations of QDs were also applied to test the optimal combination. © 2012 OSA.

Lin C.-C.,National Chiao Tung University | Chen H.-C.,National Chiao Tung University | Tsai Y.L.,National Chiao Tung University | Han H.-V.,National Chiao Tung University | And 4 more authors.
Optics Express | Year: 2012

We demonstrate a hybrid design of traditional GaAs-based solar cell combined with colloidal CdS quantum dots. With anti-reflective feature at long wavelength and down-conversion at UV regime, the CdS quantum dot effectively enhance the overall power conversion efficiency by as high as 18.9% compared to traditional GaAs-based device. A more detailed study showed an increase of surface photoconductivity due to UV presence, and the fill factor of the solar cell can be improved accordingly. © 2012 Optical Society of America.

Chang Y.-A.,Millennium Communication Co. | Kuo H.-C.,National Chiao Tung University | Lu T.-C.,National Chiao Tung University | Lai F.-I.,Yuan Ze University | And 4 more authors.
Japanese Journal of Applied Physics | Year: 2010

In this study a novel p-emitter/window capping configuration design applied to a p+-n In0.5Ga0.5P solar cell is developed. By grading the Ga and Al compositions in the interface between the p-In 0.5Ga0.5P emitter and p-In0.5Al0.5P window layers, the output characteristics of the p+-n In 0.5Ga0.5P solar cell are improved. It is found that the photoluminescence (PL) intensity is increased and the minority carrier lifetime obtained from roomtemperature time-resolved (TR) PL measurement can be increased from 5.3 ns of the typical design to 7.0 ns, indicating that the application of compositional grading can improve crystal quality and the interface becomes smoother, thus reducing the nonradiative recombination losses. Both the short-circuit current and open-circuit voltage are increased correspondingly and the conversion efficiency is improved from 14.57% of the typical design to 15.32% of the new p-emitter/window configuration under one-sun air-mass 1.5 global illumination. © 2010 The Japan Society of Applied Physics.

Wang H.W.,National Chiao Tung University | Chen H.C.,National Chiao Tung University | Chang Y.A.,Millennium Communication Co. | Lin C.C.,National Chiao Tung University | And 5 more authors.
IEEE Photonics Technology Letters | Year: 2011

In this study, p-i-n double-heterojunction GaN/In0.11Ga 0.89N solar cells grown by metal-organic chemical vapor deposition on pattern sapphire substrate are presented. The solar cell with standard process has a conversion efficiency of 3.1%, which corresponds to a fill factor of 58%, short circuit current density of 2.86 mA/cm2 , and open circuit voltage of 1.87 V under AM1.5G illumination. To further improve the conversion efficiency of the GaN/In0.11Ga0.89N solar cells, two-dimensional polystyrene nanospheres were deposited and self-organized as mask in the anisotropic inductively coupled plasma reactive ion etching process to form a biomimetic surface roughing texture. The surface morphology of the solar cell shows a periodically hexagonal bead pattern and the beads are formed in a diameter of 160 nm with a period of 250 nm. An increase of 15% in short circuit current density is found, thus improving the conversion efficiency to 3.87%. If we optimize the structure for 180 nm of the height and 375 nm of the period, a 10% gain can be expected when compared to the current structure. © 2011 IEEE.

Chen N.C.,Chang Gung University | Lu C.Y.,Chang Gung University | Chien J.W.,Chang Gung University | Chiu S.W.,Millennium Communication Co.
Optics and Laser Technology | Year: 2012

The edge emission from 850 nm vertical-cavity surface emitting lasers has a much larger linewidth and a larger redshift coefficient than the surface emission. These differences explain why the threshold current increased asymmetrically when temperature deviated from the temperature associated with the lowest threshold current. The gradient of the edge intensity-current (L-I) curve declined when current exceeded the threshold value. This decline indicates the competition between stimulated emission and other mechanisms for recombining carriers. Thus, the optimal lasing power can be derived from the edge L-I curve, and the deviation from the measured value is the sum of unwanted optical loss. © 2012 Elsevier Ltd.All rights reserved.

Kuo Y.-K.,National Changhua University of Education | Lin B.-C.,National Changhua University of Education | Chang J.-Y.,National Changhua University of Education | Chang Y.-A.,Millennium Communication Co.
IEEE Photonics Technology Letters | Year: 2011

A compositional grading layer between the p-In0.5Ga 0.5P emitter layer and p-In0.5Al0.5P window layer in the p +-n In0.5Ga0.5P solar cell is investigated numerically. With the insertion of the grading layer, the short-circuit current density and conversion efficiency are improved due to the enhancement of carrier-collection efficiency, which can be ascribed to the reduction of potential barrier height in the valance band and the existence of internal quasi-electric field in the conduction band. An optimized value of conversion efficiency can be obtained by appropriately adjusting the thickness of the grading layer. © 2011 IEEE.

Millennium Communication Co. | Date: 2010-10-14

A package structure of a concentrated photovoltaic cell includes a ceramic baseplate whereon a cavity is formed, the cavity having two opposite internal walls respectively having staircase structures, each having an upper step and a lower step; a photovoltaic chip disposed on a bottom surface of the cavity; a first electrode circuit penetrating the ceramic baseplate and with a top end electrically connected to the photovoltaic chip; a second electrode circuit penetrating the lower steps on the two sides of the ceramic baseplate and connecting with the photovoltaic cell through bonded wires; and a transparent cover disposed on the upper steps for covering the cavity and the photovoltaic chip. A fabrication method for the aforementioned package structure is also provided. The aforementioned package structure has the advantages of being more efficient in heat dissipation and effective in protecting the photovoltaic chip.

An optical navigation sensor module of an optical mouse includes a substrate with a lower surface; an image sensor arranged on the lower surface; and a light-emitting chip package using a SMD package electrically connected to the lower surface of the substrate. The light-emitting chip package emits a light beam to a tabletop and the tabletop reflects the light beam to the image sensor device. A method for manufacturing the optical navigation sensor module is also provided. This optical navigation sensor module of an optical mouse may reduce the optical loss, improve the sensitivity of the optical mouse and promote the production yield.

Millennium Communication Co. | Date: 2012-05-23

An optical lens for modulating light generated by a surface-emitting laser chip is disclosed. The optical lens includes a main body with a recess. A bottom surface of the recess is configured with a light-entering curved face, and an outer surface of the main body opposite to the bottom surface is configured with a light-existing curved face. Here, the recess is for accommodating the surface-emitting laser chip, and the surface-emitting laser chip is arranged a distance from the light-entering curved face. A light-emitting module adopting the aforementioned optical lens is also provided. The aforementioned optical lens would cause the incident light to first diverge and then converge at a predetermined angle, so that the output illuminating light is more uniform and the projecting distance is extended.

A multi-junction group III-V compound semiconductor solar cell and fabrication method thereof forms a 2D photonic crystal structure in the topmost window layer of the stacked solar cell units by etching holes in the window layer. The 2D photonic crystal structure causes omni-directional reflection of the sunlight along any transverse plane of the 2D photonic crystal structure and directs the oblique sunlight to enter the bottom surface of the holes, thereby increasing the amount of incident light. By applying the property that the 2D photonic crystal structure causes a wider range of wavelengths to have higher transmission efficiency at the window layer to the multi-junction group III-V compound semiconductor solar cell, energy conversion efficiency may be effectively increased.

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