Advanced front-surface passivation schemes for industrial n-type silicon solar cells

B.W.H. Loo, van de, G. Dingemans, E.H.A. Granneman, I.G. Romijn, G.J.M. Janssen, W.M.M. Kessels

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The n-Pasha n-type silicon solar cell currently achieves an average conversion efficiency of 20.2% using a relatively simple process flow. This bifacial cell concept developed by ECN is based on homogeneously doped p+ front and n+ back surfaces. To enhance the cell efficiency, it is important to reduce the carrier recombination within the boron-diffused p+ region and at its surface. This paper addresses a novel way to tune the boron-doping profile and presents advanced surface passivation schemes. In particular, it is demonstrated that a very thin (2nm) Al2O3 interlayer improves the passivation of the boron-doped surface; the Al2O3 films were deposited in industrial atomic layer deposition (ALD) reactors (batch or spatial). Moreover, it is shown that the boron-doping profile can be improved by etching back the boron diffusion. On the basis of the results presented, it is expect that n-Pasha solar cells with 21% efficiency will soon be within reach.
Original languageEnglish
Pages (from-to)43-50
Number of pages7
JournalPhotovoltaics International : the Technology Resource for PV Professionals
Issue number24
Publication statusPublished - 2014


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