Jk. Sheu et al., Low-operation voltage of InGaN/GaN light-emitting diodes by using a Mg-doped Al0.15Ga0.85N/GaN superlattice, IEEE ELEC D, 22(4), 2001, pp. 160-162
Low-resistivity Mg-doped Al0.15Ga0.85N/GaN strained-layer superlattices wer
e grown. In these superlattices, the maximum hole concentration is 3 x 10(1
8)/cm(3) at room temperature. Hall-effect measurements indicate high conduc
tivity of this structure in which the high activation efficiency is attribu
ted to the strain-induced piezoelectric fields. This work also fabricated I
nGaN/GaN blue LEDs that consist of a Mg-doped Al0.15Ga0.85N/GaN SLs. Experi
mental results indicate that the LEDs can achieve a lower operation voltage
of around 3 V, i.e., smaller than conventional devices which have an opera
tion voltage of about 3.8 V.