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Improving Device Efficiency for n-i-p Type Solar Cells with Various Optimized Active Layers
SHAIKHMOHAMMAD IFTIQUAR,Junsin YI 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.2
We investigated n-i-p type single junction hydrogenated amorphous silicon oxide solar cells. These cells were withoutfront surface texture or back reflector. Maximum power point efficiency of these cells showed that an optimized devicestructure is needed to get the best device output. This depends on the thickness and defect density (Nd) of the activelayer. A typical 10% photovoltaic device conversion efficiency was obtained with a Nd = 8.86×1015 cm-3 defect densityand 630 nm active layer thickness. Our investigation suggests a correlation between defect density and active layerthickness to device efficiency. We found that amorphous silicon solar cell efficiency can be improved to well above10%.
Present Status of Thin Film Solar Cells Using Textured Surfaces: A Brief Review
Hyeongsik Park,SHAIKHMOHAMMAD IFTIQUAR,Anh Huy Tuan Le,Shihyun Ahn,강준영,Yongjun Kim,Junsin Yi,Sunbo Kim,신명훈 한국전기전자재료학회 2016 Transactions on Electrical and Electronic Material Vol.17 No.5
This is a brief review on light trapping in Si based thin film solar cells with textured surfaces and transparentconducting oxide front electrodes. The light trapping scheme appears to be essential in improving device efficiencyover 10%. As light absorption in a thin film solar cells is not sufficient, light trapping becomes necessary to beeffectively implemented with a textured surface. Surface texturing helps in the light trapping, and thereby raises shortcircuit current density and its efficiency. Such a scheme can be adapted to single junction as well as tandem solar cell,amorphous or micro-crystalline devices. A tandem cell is expected to have superior performance in comparison to asingle junction cell and random surface textures appears to be preferable to a periodic structures.