Commonly Silane gas is being used in the industry for forming polysilicon. Unfortunately this gas is highly poisonous and as such unfeasible for small laboratory scale setups. This is why we're collecting alternative recipes here.
Currently we've got the polysilicon R&D challenge#Polysilicon going, for finding alternative recipes to form polysilicon without the need for the highly poisonous silane gas.
Alternatives to Boron and Phosphorus gas go here.