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Title: Designing Shallow Donors in Diamond.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the 2015 APS March Meeting held March 2-6, 2015 in San Antonio, TX.
Country of Publication:
United States

Citation Formats

Moussa, Jonathan Edward. Designing Shallow Donors in Diamond.. United States: N. p., 2015. Web.
Moussa, Jonathan Edward. Designing Shallow Donors in Diamond.. United States.
Moussa, Jonathan Edward. 2015. "Designing Shallow Donors in Diamond.". United States. doi:.
title = {Designing Shallow Donors in Diamond.},
author = {Moussa, Jonathan Edward},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2015,
month = 2

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  • The energy spectra of shallow donors and acceptors in GaAs-Ga/sub 1-x/Al/sub x/As quantum-well structures have been calculated. The binding energies of the impurities were obtained within a variational calculation in the effective-mass approximation. Calculations were performed for various types of impurity as functions of the position of the impurity in a GaAs quantum well of infinite depth and for various slab thicknesses. The effect of the spatially dependent screening is modeled with a function of the form epsilon/sup -1/(r) = epsilon/sub 0//sup -1/ + (1 - epsilon/sub 0//sup -1/) e/sup -r/a/, with a screening parameter a approx. =1.1 a.u. characteristicmore » of bulk GaAs. Results are compared with Bastard's theory, which is based on a constant epsilon/sub 0/ screening, and it is found that spatially dependent screening effects can be quite important for all acceptors in GaAs quantum wells over a large range of slab thicknesses. Calculated results with improved statistics are in quantitative agreement with experimental data.« less
  • We have investigated the dissociation of donor-hydrogen pairs in Schottky barrier capacitors fabricated from phosphorus and arsenic doped silicon, at temperatures in the range 24 to 110{degree}C. In equilibrium the release of donor trapped hydrogen does not follow first order kinetics. Introduction of minority carriers by illumination or forward bias injection enhances the rate of hydrogen release and redistribution, but otherwise leaves the functional form relatively unchanged. Numerical modeling shows that the debonding rate must be proportional to the local hole density. If the dissociation process is carried out in reverse diode bias, most of the released hydrogen rebonds deepermore » in the silicon, outside the depletion region. In addition, a portion of the charge density in the depleted region is seen to be metastable and disappears after several hours at room temperature. This observation suggests the existence of a positive charge state of the donor-hydrogen pair which may be the precursor to dissociation. While several groups have recently pointed out that reverse-bias annealing data suggest the existence of a negative charge state of interstitial hydrogen, our observation of an electronically controlled debonding rate casts considerable doubt on the firmness of that conclusion. 15 refs., 4 figs.« less
  • Abstract not provided.
  • Recent field experience with shallow, normal pressured wells in South Texas demonstrated an invert emulsion oil mud employed with a polycrystalline diamond compact (PDC) bit significantly increased PDC bit rate of penetration (ROP) and life. Each well used an invert emulsion oil mud from surface casing to total depth and a PDC bit to drill the majority of the same interval. This resulted in substantial cost savings compared to KCl/polymer and freshwater mud systems. To realize the full cost savings potential, hydraulics and mud programs were designed to maximize PDC bit performance and minimize oil mud costs. This paper examinesmore » field results and develops a correlation between hydraulics and mud programs and optimum invert emulsion oil mud-PDC bit performance.« less