Patent ID: 7714316

Claim:
A semiconductor device having a roughened side surface comprising a semiconductor substrate having a roughened side surface; a first electrode; a light emitting layer formed above the semiconductor substrate having the roughened side surface; and a second electrode; the semiconductor device being manufactured by a method comprising: forming a protective film on a part of surfaces of the semiconductor device, the semiconductor device having an side exposed surface, the protective film comprising an acid etching resistance material having a repeating unit represented by the following general formula (1): wherein in the general formula (1), R 1 is a hydrogen atom or methyl group; R 3 is a cyclic group selected from an alicyclic group and an aromatic group; R 4 is a polar group; and R 2 is a group represented by the following general formula (2): wherein in the general formula (2), R 5 is a hydrogen atom or methyl group; immersing the semiconductor device into an acid solution, thereby etching the exposed side surface of the semiconductor device to form the roughened side surface; and removing the protective film.