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Toward 20% Efficiency With a-Si // poly-Si Tandem Solar Cell

  • M. Yoshimi (a1), W. Ma (a1), T. Horiuchi (a1), C. C. Lim (a1), S. C. De (a1), K. Hattori (a1), H. Okamoto (a1) and Y. Hamakawa (a1)...

Abstract

A series of experimental investigations has been made on the a-Si // poly-Si tandem solar cell which is one of the most promised candidate of high cost-performance photovoltaic cell, e.g., high efficiency, low cost with almost no light induced degradation. Employing high conductivity with wide optical band gap p type microcrystalline SiC (μ-SiC) as a window material together with a-SiC as an interface buffer layer and also n type μc-Si as a back ohmic contact layer in the poly-Si based bottom cell, the conversion efficiency of 17.2 % has been obtained. Combining an optically transparent a-Si p-i-n cell as a top cell with an optical coupler between the top and the poly-Si bottom cell, a total efficiency of 20.3 % has been obtained so far on the four-terminal stacked mode structure. A systematic technical data for the optimization of cell structure variation on the developed tandem solar cells are presented and further possibility to improving the performance are discussed.

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Toward 20% Efficiency With a-Si // poly-Si Tandem Solar Cell

  • M. Yoshimi (a1), W. Ma (a1), T. Horiuchi (a1), C. C. Lim (a1), S. C. De (a1), K. Hattori (a1), H. Okamoto (a1) and Y. Hamakawa (a1)...

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