High responsivity of GaN p-i-n photodiode by using low-temperature interlayer

J. C. Lin, Y. K. Su, S. J. Chang, W. H. Lan, K. C. Huang, W. R. Chen, C. Y. Huang, W. C. Lai, W. J. Lin, Y. C. Cheng

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33 Citations (Scopus)


Gallium nitride p-i-n ultraviolet photodiodes with low-temperature (LT)-GaN interlayer have been fabricated. It was found that the dark current of photodiode with LT-GaN interlayer is as small as 143 pA at 5 V reverse bias. It was also found that the responsivity of the photodiode with LT-GaN interlayer can be enhanced at a small electric field (∼0.4 MVcm) due to the carrier multiplication effect. The UV photocurrent gain of 13 and large ionization coefficient (α=3.1× 105 cm-1) were also observed in the detector with LT-GaN interlayer. Furthermore, we can achieve a large peak responsivity of 2.27 AW from the photodiode with LT-GaN interlayer.

Original languageEnglish
Article number173502
JournalApplied Physics Letters
Issue number17
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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