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RISS 인기검색어
- 검색키워드
- 저자 : Hiranmoy Saha (검색결과 2 건)
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Uttam Manna,이준신,Hiranmoy Saha,Jinsu Yoo,김경해,Manoharan Gowtham,Suresh Kumar Dhungel,Utpal Gangopadhyay 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2
The absorption loss in the n/Al interface of a p-i-n thin- film solar cell is high due to the higher extinction coefficient of the Al used as a back reflector. The insertion of a thin ZnO layer in the n-a-Si : H/Al interface of a solar cell with Glass/textured SnO2 : F/p-a-SiC : H/buffer layer/i-a-Si : H/na- Si : H/Al structure minimizes the absorption loss as ZnO has a lower extinction coefficient (less than 0.5) at longer wavelengths. In this article, the dependence of various electrical characteristics, such as the resistivity, the carrier concentration, the mobility and the optical transmittance, of ZnO : Al films on the thickness and the impact of the thickness of a ZnO : Al film used as a back reflector on the performance of solar cells are reported. The ZnO:Al films are prepared by using a rf magnetron sputtering system. For a 140-nm-thick ZnO : Al layer, the short-circuit current (Isc) increases by 12.7 % in comparison to that for the pure Al-metal back-reflector case. Isc further increases by 23 % when a 180-nm ZnO : Al layer is used, and the conversion efficiency of the solar cell is around 10.26 % for the 180-nm-thick ZnO : Al. The cell efficiency depends on the film thickness. The crystal quality of the deposited film is improved as the film thickness is increased.
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Front Surface Grid Design for High Efficiency Solar Cells
Utpal Gangopadhyay,김경해,정성욱,Prabir Kanti Basu,Suresh Kumar Dhungel,Swapan Kumar Dutta,Hiranmoy Saha,이준신 한국전기전자재료학회 2005 Transactions on Electrical and Electronic Material Vol.6 No.2
Standard crystalline solar cells are generally fabricated with the front grid pattern of silver paste contact. We have reported a detailed theoretical analysis of the proposed segmented cross grid line pattern in this paper. This work was carried out for the optimization of spacing and width of grid finger, main busbar and sub-busbar. The overall electrical and optical losses due to front contact were brought down to 10 % or even less as compared to the usual loss of 15 % or more in the conventional screen printed silver paste technology by choosing proper grid pattern and optimizing the grid parameters. The total normalized power loss for segmented mesh grid with plated metal contact was also observed and the total power loss could be brought down to 10.04 % unlike 11.57 % in the case of continuous grid and plated contact. This paper is able to outline the limitations of conventional screen printed contact.
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