Patent ID: 8828786
Filing Date: 2014-09-09
Classification: H01L,Y02E

Abstract:
1. A method of fabricating a photodiode, the method comprising a forming step of a compound-semiconductor film of chalcopyrite structure adapted to work as a light-absorbing layer of the photodiode, the forming step comprising: a first step of holding a substrate temperature at a first temperature, retaining a composition ratio of (Cu/(In+Ga)) to a 0 in a Group-III element excessive state; a second step of holding the substrate temperature within a range from the first temperature to a second temperature higher than the first temperature, shifting the composition ratio of (Cu/(In+Ga)) to a 1.0 or more being a Cu element excessive state; and a third step of shifting the composition ratio of (Cu/(In+Ga)) from the 1.0 or more being the Cu element excessive state to a 1.0 or less being a Group-III element excessive state, wherein the third step comprises holding the substrate temperature for a first period at the second temperature, and holding the substrate temperature for a second period within a range from a temperature lower than the second temperature to a third temperature lower than the first temperature, for a low-temperature growth to suppress Cu precipitation on a surface of as-made compound-semiconductor film.