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Bulk solar grade silicon: how chemistry and physics play to get a benevolent microstructured material

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Abstract

The availability of low-cost alternatives to electronic grade silicon has been and still is the condition for the extensive use of photovoltaics as an efficient sun harvesting system. The first step towards this objective was positively carried out in the 1980s and resulted in the reduction in cost and energy of the growth process using as feedstock electronic grade scraps and a variety of solidification procedures, all of which deliver a multi-crystalline material of high photovoltaic quality.

The second step was an intense R&D activity aiming at defining and developing at lab scale a new variety of silicon, called “solar grade” silicon, which should fulfil the requirement of both cost effectiveness and high conversion efficiency.

The third step involved and still involves the development of cost-effective technologies for the manufacture of solar grade silicon, in alternative to the classical Siemens route, which relays, as is well-known, to the pyrolitic decomposition of high-purity trichlorosilane and which is, also in its more advanced versions, extremely energy intensive.

Aim of this paper is to give the author’s viewpoint about some open questions concerning bulk solar silicon for PV applications and about challenges and chances of novel feedstocks of direct metallurgical origin.

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  1. Department of Materials Science, University of Milano-Bicocca, Via Cozzi, 53, Milan, Italy

    S. Pizzini

  2. Nedsilicon SpA, Via Th. Edison 6, Osimo, Ancona, Italy

    S. Pizzini

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Pizzini, S. Bulk solar grade silicon: how chemistry and physics play to get a benevolent microstructured material. Appl. Phys. A 96, 171–188 (2009). https://doi.org/10.1007/s00339-008-4981-5

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