Recent Progress of the "micromorph" Tandem Solar Cells
نویسندگان
چکیده
The paper gives an overview over recent results and future potentials of the cornbined ainorphous silicon/microcrys~alline silicon "micromorph" tandem cell technology. The reported results include replacement of boron-microdoping compensation by employment of gas-purification to obtain mid-gap iriicrocrystailine silicon, leading to tne fabrication of a 3.6 ~m thick microcrystalline silicon p-i-n cell with 7. 7% s~ble efficiency. lncreased the deposition rate of microcrystalline by SiH4fAr/H2 plasma deposition results in a 3.1 % efficient microcrystalline single-junction solar cell deposited at 3.0 ~rn/hour. Further, micromorph tandem cells with 13% initial, or with 10.7% (confirmed by ISE-FhG Freiburg) stabilized efficiency arereported on. The realization of over 13 mA/cm2,current generation in a 1500 A thick a-Si:H top cell by combining high temperature deposi~on-and a ZnO intermediate reflector layer demonstràtes the potential to yet significantly decrease the top cell degradation in the micromorphtandem cell.
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