Improved characteristics of blue and green InGaN-based light-enfitting diodes on Si grown by metalorganic chemical vapor deposition

We report significantly improved characteristics of InGaN multiple-quantum well blue and green light-emitting diodes (LEDs) on Si (I 11) substrates using metalorganic chemical vapor deposition. A high-temperature-grown thin AIN layer and AIN/GaN multilayers have been used for the growth of high-quality active layer on Si substrate. The blue LED on Si exhibited an operating voltage of 4.1 V, a series resistance of 30 Omega, an optical output power of 18 muW and a peak emission wavelength of 478 nm with a full width at half maximum of 22 nm at 20 mA drive current. These characteristics are comparable to those of LED on sapphire substrate. The green LED was also fabricated on Si substrate successfully.