Kipke, Felix and Suedkamp, Tobias and Pruessing, Jan K. and Bougeard, Dominique and Bracht, Hartmut (2020) Diffusion of boron in germanium at 800-900 degrees C revisited. JOURNAL OF APPLIED PHYSICS, 127 (2): 025703. ISSN 0021-8979, 1089-7550
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Diffusion of boron (B) in germanium (Ge) at temperatures ranging between 800 degrees C and 900 degrees C is revisited following the most recent results reported by Uppal et al. [J. Appl. Phys. 96, 1376 (2004)] that have been obtained mainly with implantation doped samples. In this work, we determined the intrinsic B diffusivity by employing epitaxially grown alternating undoped and B-doped Ge layer structures with three different dopant concentrations of 4 x 10(17) cm(-3) 1 x 10(18) cm(-3), and 3 x 10(18) cm(-3). The diffusional broadening of B was analyzed by means of secondary ion mass spectrometry (SIMS) and numerically described to determine the diffusion coefficient. Additional SIMS analyses revealed a gradient in the oxygen (O) background concentration of the epitaxially doped Ge structure. A high O content observed in near-surface regions correlates with enhanced B diffusion. In contrast, B-doped regions with low O content showed a significantly lower B diffusivity representing the intrinsic diffusivity. The B diffusion coefficients are significantly lower compared to literature data and best described by a diffusion activation enthalpy and a pre-exponential factor of (4.09 + 0.21) eV and 265(-237)(-2256) cm(2) s (1), respectively.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PHOSPHORUS DIFFUSION; ACTIVATION; DOPANTS; GE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Dominique Bougeard |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Apr 2021 11:14 |
| Last Modified: | 01 Apr 2021 11:14 |
| URI: | https://pred.uni-regensburg.de/id/eprint/45349 |
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