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polysilicon industry siemens process supply semiconductor industry fluidized bed reactor (fbr) demand market report solar industry solar grade silicon forecast polysilicon price cash costs electronic grade polysilicon market industry cost curve spot price upgraded metallurgical-grade (umg) silicon hydrochlorination polysilicon manufacturers market outlook production technology monosilane silicon producers manufacturing costs global polysilicon market silicon purity market share market analysis monocrysalline industtry cost curve 2024 polysilicon producers 2020 silicon production industry forecast solar-grade silicon polysilicon production silicon manufacturing photovoltaic industry