Arima Eco Energy Technologies Corp.

Tech conecpt

※Technology and theory of CPV
CPV (Concentrator Photovoltaic) is a technology that is different from conventional photovoltaic (e.g. crystalline silicon) and thin-film. The most significant advantage of CPV is that it is capable of generating a much higher degree of output power, particularly under good sunlight circumstance. Areas affluent in sufficient daily full sun hours and with less humidity (e.g. Southern Europe, South-western China, South-western part of the United States) are best suitable for the application of CPV.
※The general theory of CPV technology is to concentrate sun irradiation onto the surface of the solar cell to carry out the optic-electric conversion. CPV features in the following attributes:
	◎Use of material with high efficiency
	The core material of CPV’s solar cell is triple-junction Gallium Arsenide (GaAs) which absorbs much greater extent of spectrum and is thus able to perform a higher converting efficiency (36%~40%).
	◎Solar Cell
	＊ Triple junction solar cell with InGaP/InGaAs/Ge ＊ Active Area：0.3025 cm2 ( 5.5mm * 5.5mm ) ) ＊ Efficiency ≧35% ＊ 500x concentration ＊ Spectral response from 350 – 1800 nm ＊ Multi-layer antireflection coating optimized for a front surface adhesive ＊ 25 μm thick Ag interconnects with minimal series resistance

	◎Solar Cell Assembly
	＊ Metal core PCB adapted from the high brightness LED package with excellent heat dissipation ＊ Electrical insulation layer has a good thermal conductivity coefficient ＊ A cover glass laminated with EVA buffer layer for environmental protection ＊ Peripheral interfaces are treated with silicone sealant for moisture insulation

	◎Use of optical element with high concentration ratio─Fresnel lens
	The concentration of irradiation is achieved by the optical design, using Fresnel lens which concentrates sunlight onto the GaAs solar cell. The concentration ratio of Fresnel lens ArimaEco uses is 476 times, which effectively boosts the focus of sunlight.
	Primary Optics ★ Fresnel lens with 120120mm2 clear aperture made by PMMA material ★ geometric concentration ratio of the concentrator is 476x, with an efficiency of about 80% Secondary Optics* ★ Stainless steel based cone reflector utilized to increase acceptance angle

	◎Use of sun tracker with high precision
	In order to make sure CPV modules concentrate as much direct sunlight as possible, a tracker which is capable of sensing sunlight and following the movement of the sun is thus prerequisite. The tracker needs to be endowed with high precision of movement and is able to move in dual-axis action so that to ensure the best performance of tracking.

Tech concept