| 摘要 |
PURPOSE: To improve the external quantization efficiency by selecting a substance composition of a surface layer so as to extend its band gap, thereby extending a P-region while penetrating through the surface layer and avoiding a loss due to surface recombination. CONSTITUTION: A thin surface layer 1 is placed on a layer 2 containing the same mixed crystal, and the material composition of a surface layer 1 is selected so as to expand the band gap in comparison with the band gap of the coated material and a P-region 5 is extended while penetrating through the surface layer 1. The P-channel conduction region 5 is manufactured by diffusing zinc and is introduced through the surface layer 1 into a GaAs0.6 P0.4 layer 2. In this case, the thickness (x) of the P-layer in existence in the layer 2 is about 1.2μm and the entire thickness (a) of the player P is selected to be about 1.3μm. Thus, a loss by the surface recombination is avoided and the external quantization efficiency is improved. |
