Influence of adsorbates on the surface conductivity of chemical vapor deposition diamond

Szameitat, M.; Jiang, Xin; Beyer, W.

doi:10.1063/1.1290725

Cited by 31 publications

(21 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The conductance rises slowly over a time period of minutes to hours. This is in accordance with other results detailing the change in resistance after exposing annealed samples to air [15,16].…”

Section: Resultssupporting

confidence: 82%

See 1 more Smart Citation

Reversible Switching of the Surface Conductance of Hydrogenated CVD Diamond Films

Cannaerts

Nesládek

Haenen

et al. 2001

phys. stat. sol. (a)

View full text Add to dashboard Cite

Chemical vapor deposited (CVD) diamond films have a controversial history regarding their surface electronic properties. Hydrogenation is known to induce a p-type conductive surface layer, which is not present on non-hydrogenated samples. The enhanced surface conductance can decrease significantly after annealing under high vacuum conditions at as low as 200 C (a temperature which is sufficiently low to ensure that the hydrogen termination remains intact). Although the hydrogen is necessary for the surface conductance, the surface can be made poorly conductive without removing the hydrogen termination. We have performed scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) to better understand the origin of the enhanced surface conductance. Our STS experiments confirm that hydrogenation induces the appearance of a conductive surface layer, which can change considerably after high vacuum annealing. In this paper, we will discuss the conditions under which the surface conductivity can be restored. In particular we study the conductance changes during plasma hydrogenation and after exposing it to atmospheric conditions. Topographical STM scans confirm that the surface structure is not altered at low annealing temperatures.

show abstract

Section: Resultssupporting

confidence: 82%

“…3b: much lower current is flowing for the same applied bias. This is in accordance with previous STS results [9,10,23] and measurements examining the change in resistance with temperature [5,8,15,16]. Fig.…”

Section: Resultssupporting

confidence: 81%

Reversible Switching of the Surface Conductance of Hydrogenated CVD Diamond Films

Cannaerts

Nesládek

Haenen

et al. 2001

phys. stat. sol. (a)

View full text Add to dashboard Cite

show abstract

“…1. [9][10][11]15 The left-hand side of the band diagram refers, in each case, to the asymptotic situation inside the bulk of our specimens corresponding to a Fermi-level position E F about 0.3 eV above the valence-band maximum E V for the borondoped type IIb crystal 16 or deep in the gap for nominally undoped IIa crystals.…”

mentioning

confidence: 99%

Surface band bending and surface conductivity of hydrogenated diamond

et al. 2003

View full text Add to dashboard Cite

We establish a strict correlation between the total photoelectron yield spectra and the surface conductivity of hydrogenated diamond. The decomposition of the yield spectra into electron and exciton derived contributions requires an upward surface band bending to accompany surface conductivity, while an essentially flat band or downward band bending is observed after removing the surface conductivity by annealing in vacuum. Between the two competing models proposed for surface conductivity with a sheet hole density of 10 13 cm Ϫ2 , these results favor the surface transfer-doping model strongly over the subsurface acceptor model.

show abstract

“…A typical sample was successively annealed to 523, 573 and 623 K, with a heating rate 10 K/min, similarly to Ref. [10]. After reaching the desired temperature and a waiting time of 1 min, the sample was cooled down to room temperature with approximately the same rate.…”

mentioning

confidence: 99%