A systematic investigations on high efficiency a-Si //poly-Si four-texminal structure tandem solar cell has been made both on theoretical and experimental approaches. It has been shown from an optimum design theory made on a realistic attainable best efficiency that the best combinations of tandem solar cell is a-Si / poly-Si silicon materials in its high achievable efficiency. In the optical design rule, priority of the photon utilization put on the poly-Si bottom cell. Employing high conductivity with wide optical band gap p type pc-Sic as a window material, n type IC-Si as back ohmic contact with BSF treatment. the conversion efficiency of 17.2% has been obtained for the poly-Si cell. An optimum design of the a-Si top cell has been experimentally made on p pc-Sic/ p a-SiC/i a-Si/n pc-Si/ITO structure, and an efficiency of 7.25% has been obtained with IOonm thick i-layer top cell. While the best efficiency of p-i-n single-junction solar cell with this structure is 12.3% so far with 5 h i-layer thickness deviced by Ag back electrode. With the IOOnm thick ultra thin top cell, a total conversion efficiency of a-Si // poly-Si fourterminal tandem solar cell as high as 21 .O% has been achieved.
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