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http://hdl.handle.net/1942/17138
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DC Field | Value | Language |
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dc.contributor.author | Seshan, Venkatesh | - |
dc.contributor.author | Murthy, Dharmapura H. K. | - |
dc.contributor.author | Castellanos-Gomez, Andres | - |
dc.contributor.author | Sachdeva, Sumit | - |
dc.contributor.author | Ahmad, Hakeem A. | - |
dc.contributor.author | JANSSENS, Stoffel | - |
dc.contributor.author | JANSSEN, Wiebke | - |
dc.contributor.author | HAENEN, Ken | - |
dc.contributor.author | van der Zant, Herre S. J. | - |
dc.contributor.author | Sudholter, Ernst J. R. | - |
dc.contributor.author | Savenije, Tom J. | - |
dc.contributor.author | de Smet, Louis C. P. M. | - |
dc.date.accessioned | 2014-09-12T11:29:27Z | - |
dc.date.available | 2014-09-12T11:29:27Z | - |
dc.date.issued | 2014 | - |
dc.identifier.citation | ACS APPLIED MATERIALS & INTERFACES, 6 (14), p. 11368-11375 | - |
dc.identifier.issn | 1944-8244 | - |
dc.identifier.uri | http://hdl.handle.net/1942/17138 | - |
dc.description.abstract | Hydrogen and oxygen surface-terminated nanocrystalline diamond (NCD) films are studied by the contactless time-resolved microwave conductivity (TRMC) technique and X-ray photoelectron spectroscopy (XPS). The optoelectronic properties of undoped NCD films are strongly affected by the type of surface termination. Upon changing the surface termination from oxygen to hydrogen, the TRMC signal rises dramatically. For an estimated quantum yield of 1 for sub-bandgap optical excitation the hole mobility of the hydrogen-terminated undoped NCD was found to be similar to 0.27 cm(2)/(V s) with a lifetime exceeding 1 mu s. Assuming a similar mobility for the oxygen-terminated undoped NCD a lifetime of similar to 100 ps was derived. Analysis of the valence band spectra obtained by XPS suggests that upon oxidation of undoped NCD the surface Fermi level shifts (toward an increased work function). This shift originates from the size and direction of the electronic dipole moment of the surface atoms, and leads to different types of band bending at the diamond/air interface in the presence of a water film. In the case of boron-doped NCD no shift of the work function is observed, which can be rationalized by pinning of the Fermi level. This is confirmed by TRMC results of boron-doped NCD, which show no dependency on the surface termination. We suggest that photoexcited electrons in boron-doped NCD occupy nonionized boron dopants, leaving relatively long-lived mobile holes in the valence band. | - |
dc.description.sponsorship | The authors thank Milos Nesladek (Hasselt University) for insightful discussions. The contribution of D.H.K.M. is part of the Dutch Polymer Institute (DPI, project #681) research program. This work was supported by the Delft University of Technology, the Hasselt University, the Research Program G.0555.10N of the Research Foundation-Flanders (FWO), the European Union (FP7) through the programs RODIN, MOLESOL, DIAMANT, DIADEMS, the Marie Curie ITN "MATCON" (PITN-GA-2009-238201), and the Marie Curie "STRENGTHNANO" (PIEF-GA-2011-300802). | - |
dc.language.iso | en | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.rights | © 2014 American Chemical Society. | - |
dc.subject.other | photoconductance; nanocrystalline diamond; TRMC; carrier lifetime; mobility; contactless | - |
dc.subject.other | photoconductance; nanocrystalline diamond; TRMC; carrier lifetime; mobility; contactless | - |
dc.title | Contactless Photoconductance Study on Undoped and Doped Nanocrystalline Diamond Films | - |
dc.type | Journal Contribution | - |
dc.identifier.epage | 11375 | - |
dc.identifier.issue | 14 | - |
dc.identifier.spage | 11368 | - |
dc.identifier.volume | 6 | - |
local.format.pages | 8 | - |
local.bibliographicCitation.jcat | A1 | - |
dc.description.notes | [Seshan, Venkatesh; Murthy, Dharmapura H. K.; Sachdeva, Sumit; Ahmad, Hakeem A.; Sudholter, Ernst J. R.; Savenije, Tom J.; de Smet, Louis C. P. M.] Delft Univ Technol, Dept Chem Engn, NL-2628 BL Delft, Netherlands. [Seshan, Venkatesh; Castellanos-Gomez, Andres; van der Zant, Herre S. J.] Delft Univ Technol, Kavli Inst Nanosci, NL-2628 CJ Delft, Netherlands. [Murthy, Dharmapura H. K.] Dutch Polymer Inst, NL-5600 AX Eindhoven, Netherlands. [Janssens, Stoffel D.; Janssen, Wiebke; Haenen, Ken] Hasselt Univ, Inst Mat Res IMO, BE-3590 Diepenbeek, Belgium. [Janssens, Stoffel D.; Janssen, Wiebke; Haenen, Ken] IMEC Vzw, IMOMEC, BE-3590 Diepenbeek, Belgium. t.j.savenije@tudelft.nl; l.c.p.m.desmet@tudelft.nl | - |
local.publisher.place | WASHINGTON | - |
local.type.refereed | Refereed | - |
local.type.specified | Article | - |
dc.identifier.doi | 10.1021/am501907q | - |
dc.identifier.isi | 000339472100070 | - |
item.accessRights | Restricted Access | - |
item.contributor | Seshan, Venkatesh | - |
item.contributor | Murthy, Dharmapura H. K. | - |
item.contributor | Castellanos-Gomez, Andres | - |
item.contributor | Sachdeva, Sumit | - |
item.contributor | Ahmad, Hakeem A. | - |
item.contributor | JANSSENS, Stoffel | - |
item.contributor | JANSSEN, Wiebke | - |
item.contributor | HAENEN, Ken | - |
item.contributor | van der Zant, Herre S. J. | - |
item.contributor | Sudholter, Ernst J. R. | - |
item.contributor | Savenije, Tom J. | - |
item.contributor | de Smet, Louis C. P. M. | - |
item.fullcitation | Seshan, Venkatesh; Murthy, Dharmapura H. K.; Castellanos-Gomez, Andres; Sachdeva, Sumit; Ahmad, Hakeem A.; JANSSENS, Stoffel; JANSSEN, Wiebke; HAENEN, Ken; van der Zant, Herre S. J.; Sudholter, Ernst J. R.; Savenije, Tom J. & de Smet, Louis C. P. M. (2014) Contactless Photoconductance Study on Undoped and Doped Nanocrystalline Diamond Films. In: ACS APPLIED MATERIALS & INTERFACES, 6 (14), p. 11368-11375. | - |
item.validation | ecoom 2015 | - |
item.fulltext | With Fulltext | - |
crisitem.journal.issn | 1944-8244 | - |
crisitem.journal.eissn | 1944-8252 | - |
Appears in Collections: | Research publications |
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