Patent ID: 8703251

Claim:
A method for growing a metal sulphide thin film, comprising the steps of: immersing a first carrier and a second carrier in a reaction tub filled with an alkaline solution comprising at least a metal ion and a plurality of sulphur-based compounds, wherein the second carrier is disposed below the first carrier and arranged vertical to a bottom surface of the reaction tub, wherein the metal ion is the source of the metal in the metal sulphide thin film, the first carrier is horizontally held by a first carrier holder disposed below the first carrier, and the second carrier is vertically held by a second carrier holder disposed above the second carrier; and irradiating the first carrier with a light source producing light and positioned above the first carrier, such that the metal sulphide thin film is grown on the first carrier by photochemical deposition and grown on the second carrier by chemical bath deposition, respectively; and wherein the sulphur-based compounds comprise thiosulfate (S 2 O 3 2− ) and thiourea (CSN 2 H 4 ), and wherein the metal sulfide thin film is (AgInS 2 ) x /(ZnS) 2(1-x) , wherein 0<x<1.