An array substrate, a fabrication method thereof, and an organic light-emitting diode display device are provided; the array substrate (10) comprises a base substrate (100), the base substrate (100) including a display region (102) and a peripheral region (101) surrounding the display region (102), the display region (102) including: a plurality of data lines (12) and a plurality of gate lines (11) intersecting with each other, a plurality of pixel regions (21), formed in a matrix and defined by the plurality of data lines (12) and the plurality of gate lines (11) intersecting with each other formed on the base substrate (100), wherein a thin film transistor (32) is formed in each of the plurality of pixel regions (21); and further, the array substrate (10) also comprises at least one solar cell unit (31), which, together with the thin film transistor (32), is located on a same side of the base substrate (100), and is formed in at least one of the plurality of pixel regions (21) and the peripheral region (101).