Atomic layer deposited molybdenum oxide for the hole-selective contact of silicon solar cells

M. Bivour, B. Macco, J. Temmler, W.M.M. Kessels, M. Hermle

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Abstract

Passivating and carrier selective contacts formed by metal oxide induced junctions are promising candidates to improve the efficiency of silicon solar cell. Important aspects for the optimization of such induced junctions are addressed by means of numerical device simulations. Experimentally, atomic layer deposited (ALD) molybdenum oxide (MoOx) films are tested for their ability to form a hole-selective contact. To this end, the induced c-Si band bending, the external and implied Voc and the crystallinity of the films are analyzed. It is shown that the properties of the induced p/n-junction are strongly influenced by the deposition temperature and the type of buffer layer applied. While a clear correlation between the induced band bending and the external Voc is observed, the overall level remains well below that of a reference system for which thermally evaporated MoOx was used. These results indicate that for the investigated ALD films a too low work function is limiting the formation of an efficient hole contact.
Original languageEnglish
Pages (from-to)443-449
Number of pages7
JournalEnergy Procedia
Volume92
DOIs
Publication statusPublished - 23 Sep 2016
Event6th International Conference on Silicon Photovoltaics (SiliconPV 2016) - Chambéry, France
Duration: 7 Mar 20169 Mar 2016
Conference number: 6
http://www.siliconpv.com/home.html

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