In-Sik Yu

Solar Module with a Glass Surface of AG (Anti-Glare) Structure

Currently, solar module is using the two methods such as a glass-filled method or a super-straight method. The common point of these methods is to use glass structure on the front of solar module. However, the reflectance of the solar module is high depending on the height of the incident sunlight due to the flat surface of the module front glass. Purposed to solve these problems, AG (anti-glare) structures were formed on the glass surface. Next is fabrication methods of AG structure. First, uneven structure made by micro blaster equipment was dipped in Hydro-fluidic acid (HF) acid. HF acid process was carried out to remove particles and to make high transmittance. The reflectance and transmittance of the anti-glare glass was compared to those of the bare glass. The reflectance of anti-glare glass decreased approximately 1% compared with bare glass. The transmittance of anti-glare glass was similar to bare glass. According to the sample angle, the difference of the reflectance between bare glass and the anti-glare glass was about 19%. Isc and efficiency value of anti-glare glass on bare solar cell appeared about 3.01 mA and 0.228% difference compared with bare glass. Anti-glare glass on textured solar cell appeared about 9.46 mA and 0.741% difference compared with bare glass. As a result, the role of anti-glare in the substrate is to reduces the loss of sunlight reflected from the surface. In this study, therefore, AG structure on the solar cell was used to improve the efficiency of solar cell.

Design and fabrication of a MEMS-based multi-sensor

In this paper, a newly-designed tamper detection multi-sensor with various functions is proposed. The multi-sensor consists of three different sensors, a piezoresistive sensor with and without mass, a proximity sensor, and a photodiode sensor, which use MEMS technology. The various components of the multi-sensor, could perceive different types of external tampers independently, resulting in more reliable responses. The multi-sensor could be applied to detect external tampers on various types of system and mobile units.

Fabrication of a micro-PCR chip with a heat-sink using TiO 2 nano-Fluid

In this paper, a newly-designed micro-PCR chip with a heat-sink using TiO2 nano-fluid is proposed. The chip consists of three parts; a top part with the micro channel including an integrated heater and sensor, a middle part of the micro chamber that specimens react in, and a bottom part of the micro-fluidic channel that the nano-fluid flows into as the role of a heat-sink. The nano-fluid made use of the TiO2 material. In order to investigate the heating of a micro chamber, an infrared thermal imaging system measured temperature changes in the chambers.

Fabrication of a Micro-Fluidic Filter/Channel using MEMS Technology

This paper investigates the design and fabrication of a micro-fluidic filter/channel using different methods. The micro-fluidic filter is fabricated by anodic reaction with (110) wafer. The most ideal micro-fluidic channel is fabricated by microblaster process, and HNA solution etching. It is expected that proposed micro-fluidic filter/channel would likely be applied micro-fluidic systems that could classify necessary materials to react and measure.

Solar cell surface texturing using a micro-blaster etching technique

In this paper, we describe a new fabrication method of texturing technology to use of micro-blaster for display process to develop surface texturing of new solar cell and to examine how to reduce reflection of solar ray.

Photoresist spray coating for three-dimensional micro structure

This paper presents the method for three-dimensional micro structure with photoresist spray coating system. The system consists of a high temperature rotational chuck, ultrasonic spray nozzle module, angle control module and nozzle moving module. Spray coating system is effected by several parameters such as the solid contents, the dispensed volume, the scanning speed of the spray nozzle and the wafer of dimension. The photoresist (AZ 1512) has been coated on the three-dimensional micro structure by spray coating system and the characteristics have been evaluated.

Eight-beam piezoresistive accelerometer fabricated by using a selective porous silicon etching method

This paper presents the first experimental results of a piezoresistive silicon accelerometer with eight beams fabricated by a unique silicon micromachining technique using selective porous silicon etching. This technique is capable of precisely constructing a microstructure without any lateral etching or undercutting. By the use of eight-beam structure, the mechanical strength of the accelerometer can be highly improved due to smaller shear stress. The lower sensitivity of the sensor can be simply solved by combining four output signals of half-bridge. The effectiveness of the sensor is confirmed through an experiment in which the accelerometer is characterized.

Temperature dependence of porous silicon resistance

Porous silicon resistors have been fabricated and the resistance at temperatures between 100 K and 400K has been measured in order to investigate the relationship between the temperature dependence of porous silicon resistance and the anodization process. Porous silicon layer was formed in the n/sup +/ region between contacts by anodization in 15 % aqueous HF solution. Anodization time was fixed at 5 minutes and anodization voltage varied. The temperature dependence of the porous silicon resistance varied widely with the anodization voltage. A model explaining the experimental results has been proposed in this paper.