PVI Paper

Polysilicon vs. upgraded metallurgicalgrade silicon (UMG-Si): Technology, quality and costs

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By Eduardo Forniés, Laura Méndez & Marta Tojeiro, Aurinka PV Group

During the severe plummet of PV prices that took place during 2008–2012 as a result of overcapacity, the polysilicon sector suffered a major adjustment of costs and capacity to face the reduction in prices and the mismatch between demand and supply. In 2012 that significant drop in prices provoked the bankruptcy of many polysilicon producers, with only the large and efficient players still surviving. However, there was also an impact on the (at that time) promising and immature industry of metallurgical purification of metal silicon, also known as upgraded metallurgical-grade silicon (UMG-Si). The strong selling point of UMG-Si producers – the production costs – was no longer an asset, leaving UMG-Si with nothing but its weakness – the quality. The generation costs for solar energy are currently comparable to those for conventional fuels. The solar industry is self-sustaining and is not dependent on government subsidies. In this current situation, the industry requires an updated comparison between the two main routes of silicon purification and their products, which is the aim of this paper.

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Published In

PVI Issue
This issue of Photovoltaics International features an industry-first analysis of the rate at which manufacturing expansion announcements over the past two years are being turned into real nameplate production capacity. In another special report Finlay Colville characterises the nature of the current PV capex cycle as compared to the last. Whereas the previous spending cycle was notable for being “frantic”, the latest one has so far been more measured, with manufacturers focusing on strengthening their positions in specific segments of the value chain. Other highlights in this issue include a paper from researchers at the Solar Energy Research Institute of Singapore (SERIS) exploring cell-to-module losses.

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