Excess noise in high-current diamond diodes

Subhajit Ghosh, Harshad Surdi, Fariborz Kargar, Franz A. Koeck, Sergey Rumyantsev, Stephen Goodnick, Robert J. Nemanich, Alexander A. Balandin

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We report the results of an investigation of low-frequency excess noise in high-current diamond diodes. It was found that the electronic excess noise of the diamond diodes is dominated by the 1/f and generation-recombination noise, which reveals itself as Lorentzian spectral features (f is the frequency). The generation-recombination bulges are characteristic of diamond diodes with lower turn-on voltages. The noise spectral density dependence on forward current, I, reveals three distinctive regions in all examined devices—it scales as I2 at the low (I < 10 μA) and high (I > 10 mA) currents and, rather unusually, remains nearly constant at the intermediate current range. The characteristic trap time constants, extracted from the noise data, show a uniquely strong dependence on current. Interestingly, the performance of the diamond diodes improves with the increasing temperature. The obtained results are important for the development of noise spectroscopy-based approaches for device reliability assessment for high-power diamond electronics.

Original languageEnglish (US)
Article number062103
JournalApplied Physics Letters
Issue number6
StatePublished - Feb 7 2022

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Excess noise in high-current diamond diodes'. Together they form a unique fingerprint.

Cite this