Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
1 PublicationDouble injection of charge carriers in chemical vapor deposited diamond-based diodes
Weima, J. A.; von Borany, J.; Messinger, K.; Horstmann, J.; Fahrner, W. R.
Abstract
Boron ion implantation of thermochemically polished chemical vapor deposited diamond films with multienergies ranging between 24 and 150 keV and a total dose of about 2E16 cm-2 is used to get p-type conductivity. n-type conductivity is achieved by lithium ion implantation of the diamond films with a single energy of 50 keV and a dose of 2E16 cm-2. The intrinsic areas separating the p- and n-doped regions form the active areas of the diodes into which charge carriers are simultaneously injected upon bias. Onset voltages of < 10 V are due to the low concentration (~1E14 cm-3) of nitrogen related centers in the diamond films. The currentvoltage (IV) characteristics of the p-i-n diodes manifest trap filling, FrenkelPoole emission, thermionic emission, and space charge limited current regimes. At 300°C, currents as high as 12 mA are measured at a forward bias of 100 V. Rectification ratios of up to about four orders of magnitude are achieved. They increase with increasing width of the i-region within the measured i-region of 310 µm, as a result of the considerable decrease of the reverse bias current relative to the forward bias current.
Keywords: diamond; pin-diodes; conduction mechanism
- Journal of Applied Physics 92(7)(2002) 4047-4052
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