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Towards high-efficiency thin-film silicon solar cells with the “micromorph” concept
Auteur(s)
Meier, Johannes
Dubail, S.
Platz, R.
Torres, Pedro
Kroll, U.
Anna Selvan, J. A.
Pellaton Vaucher, N.
Hof, Ch.
Fischer, D.
Keppner, Herbert
Flückiger, R.
Shah, Arvind
Shklover, V.
Ufert, K. -D.
Date de parution
1997
In
Solar Energy Materials and Solar Cells, Elsevier, 1997/49/1-4/35-44
Résumé
Tandem solar cells with a microcrystalline silicon bottom cell (1 eV gap) and an amorphous-silicon top cell (1.7 eV gap) have recently been introduced by the authors; they were designated as “micromorph” tandem cells. As of now, stabilised efficiencies of 11.2% have been achieved for micromorph tandem cells, whereas a 10.7% cell is confirmed by ISE Freiburg. Micromorph cells show a rather low relative temperature coefficient of 0.27%/K. Applying the grain-boundary trapping model so far developed for CVD polysilicon to hydrogenated microcrystalline silicon deposited by VHF plasma, an upper limit for the average defect density of around 2 × 10<sup>16</sup>/cm<sup>3</sup> could be deduced; this fact suggests a rather effective hydrogen passivation of the grain-boundaries. First TEM investigations on μc-Si : H p-i-n cells support earlier findings of a pronounced columnar grain structure. Using Ar dilution, deposition rates of up to 9 Å/s for microcrystalline silicon could be achieved.
Identifiants
Type de publication
journal article
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