Silicon material classification method

The invention discloses a silicon material classification method, relates to the technical field of photovoltaics, and is used for classifying N-type particle silicon. The silicon material classification method comprises the following steps: providing N-type particle silicon; performing grade classification on the N-type particle silicon based on a preset classification standard; wherein the preset classification standard at least comprises two grades, each grade comprises a plurality of judgment indexes, and each judgment index has a value range corresponding to different grades; the judgment indexes comprise donor impurity concentration, acceptor impurity concentration, minority carrier lifetime, total metal impurity content, oxygen concentration and carbon concentration of the N-type particle silicon. According to the silicon material classification method provided by the invention, the application of the granular silicon can be optimized, and the utilization rate of the incoming granular silicon can be im