Enhanced and stable electron emission of carbon nanotube emitter arrays by post-growth hydrofluoric acid treatment

Kim, Ki Seo; Ryu, Jae-Chun; Lee, C.S.; Jang, Jin; Park, Kyu Chang

doi:10.1007/s10854-007-9463-6

Cited by 19 publications

(6 citation statements)

References 9 publications

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“…On the other hand, the HF treated device shows a significant improvement in EQE. The high porosity of the nanotube film means that hydrofluoric acid can penetrate through to the underlying silicon allowing the oxide to be removed without harm to the nanotubes 11. Indeed, the presence of an S 11 absorption feature in the UV‐Vis‐NIR spectra of the LAB nanotube films on silicon show that they are still present and their electronic properties unchanged after the HF treatment although adsorbed oxygen will have been largely replaced with fluorine 11…”

Section: Resultsmentioning

confidence: 99%

The Role of Nanotubes in Carbon Nanotube–Silicon Solar Cells

Tune

Hennrich

Dehm

et al. 2013

Advanced Energy Materials

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The mechanism of action of nanotube‐silicon heterojunction solar cells is under discussion with literature reports suggesting either p‐n or Schottky junction characteristics. The crux of the issue is whether the nanotubes contribute to the observed photocurrent or not. In order to further understand the mechanism of action of these solar cells, devices were fabricated using nanotubes sorted by (n,m) species, so that the excitonic transition is well defined and is outside the range of absorption of silicon and such that any contribution to the photocurrent from the nanotubes should be easily resolved from that of the silicon by analysis of the photocurrent spectrum. The devices exhibited the photocurrent spectra of silicon only, indicating that the nanotubes do not contribute to the photocurrent. However, by changing the back contact electrode material, results were obtained that appear to show such a contribution.

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Section: Resultsmentioning

confidence: 99%

The Role of Nanotubes in Carbon Nanotube–Silicon Solar Cells

Tune

Hennrich

Dehm

et al. 2013

Advanced Energy Materials

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“…More detail process for HF treatment process was reported on article. [13] The electron emission current was measured on 8 V/μm field. The electron emission current has maximum value on 20 sec treatment time.…”

Section: Electron Emission Of Rap Cnt With Post Growth Treatmentmentioning

confidence: 99%

12.1: Invited Paper: Enhanced Electron Emission of Carbon‐Nanotube Emitters with Post‐Growth Treatment

Lim

Ryu

Lim

et al. 2009

Symp Digest of Tech Papers

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We used a resist‐assisted patterning (RAP) process for the growth of CNTs as electron emitters. The electron emission sites were easily controlled by simple resist patterning process. To obtain stabilized and enhanced electron emission, post growth treatment process was adopted. The electron emission current strongly depended on the post growth treatment conditions. The electron emission current was increased with increasing acid treatment time up to 20 second. The enhanced electron emission current was more enhanced with consecutive post growth temperature and acid treatment. After 20 sec post growth treatment on robust CNTs, we can obtain 1.62 mA/cm2 current density at 4 V/μm field. The controlled electron emission current of CNT emitter array with RAP process and structural improvement of CNT‐FEAs after HF treatment for enhanced electron emission was discussed.

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“…CNTs have several excellent advantages as cold cathode emitters such as high aspect ratio, high thermal conductivity, and structural rigidity. Many post-treatment processes have been conducted to improve the electrical properties of CNTs [1,2,3,4,5,6,7]. Because of these various advantages, CNTs are suitable for electron sources.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Stable Carbon Nanotube Cold Cathode Electron Emitters with Post-Growth Electrical Aging

2018

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We fabricated carbon nanotube (CNT) cold cathode emitters with enhanced and stable electron emission properties and long-time stability with electrical aging as a post-treatment. Our CNT field emitters showed improved electrical properties by electrical aging. We set the applied bias for effective electrical aging, with the bias voltage defined at the voltage where Joule heating appeared. At the initial stage of aging, the electron emission current started to increase and then was saturated within 3 h. We understood that 5 h aging time was enough at proper aging bias. If the aging bias is higher, excessive heating damages CNT emitters. With the electrical aging, we obtained improved electron emission current from 3 mA to 6 mA. The current of 6 mA was steadily driven for 9 h.

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Enhanced and stable electron emission of carbon nanotube emitter arrays by post-growth hydrofluoric acid treatment

Cited by 19 publications

References 9 publications

The Role of Nanotubes in Carbon Nanotube–Silicon Solar Cells

The Role of Nanotubes in Carbon Nanotube–Silicon Solar Cells

12.1: Invited Paper: Enhanced Electron Emission of Carbon‐Nanotube Emitters with Post‐Growth Treatment

Fabrication of Stable Carbon Nanotube Cold Cathode Electron Emitters with Post-Growth Electrical Aging

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