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AlGaInP-Based LEDs With a {\rm p}^{+} -GaP Window Layer and a Thermally Annealed ITO Contact

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5 Author(s)
Lo, H.C. ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Shei, S.C. ; Zeng, X.F. ; Shoou-Jinn Chang
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In this paper, indium-tin-oxide (ITO) films were deposited on p-type GaP films with a AuBe-diffused metal layer to form ohmic contacts. Without the AuBe diffused into p-GaP films, the ITO deposited on p-GaP showed a non-ohmic characteristic. After the AuBe diffused, the ITO deposited on p-GaP displayed a linear current-voltage characteristic and the specific contact resistance showed 2.63 × 10-4 ω-cm2. Furthermore, the specific contact resistance could be improved to 1.57 × 10-4 ω-cm2 when the sample post-ITO-deposition annealed at 400°C. The transmittance of ITO film almost was kept at 90% in the wavelength range of 400-700 nm after thermal annealing. These results revealed that the ITO films can be a suitable transparent current spreading layer for the fabrication of AlGalnP-based light-emitting diodes with an AuBe-diffused metal layer. It was also found that the 20 mA forward voltages measured from LEDs with Device A, Device B, Device C and Device D were 1.97, 1.96, 1.95 and 2.66 V and the light output powers were 4.2, 5.7, 6.0 and 6.3 mW, respectively.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:47 ,  Issue: 6 )