chemical formula PH3, phosphine is pyrophoric and is a very toxic gas with a TLV of 0.3ppm. Phosphine is combustible in the range of 1.2-98% and has a decaying fish like order. Phosphine is used as a dopant gas during CVD and as an dopant source for ion implant.
Phosphine is the common name for phosphorus hydride (PH3), also known by the IUPAC name phosphane and, occasionally, phosphamine. It is a colorless, flammable gas with a boiling point of −88 °C at standard pressure. Pure phosphine is odorless, but "technical grade" phosphine has a highly unpleasant odor like garlic or rotting fish, due to the presence of substituted phosphine and diphosphine (P2H4).