13 January 2016 5 427 Report

Dear All,

I want to characterize ohmic contacts to n- and p-type GaAs with Transmission Lline Model (TLM) measurement. I cannot decide on true pad size and the spacing. I conveyed a quick literature survey but it was not very helpfull because sizes and spacings differs in each study. So I'm asking to you. Is it wise to choose the width of the contact pad to be equal to the width of the metal gate of the device we  fabricate? The high power laser diode (HPLD) we want to fabricate will be ~150 um thick. Can I use this value as a range for the pad spacing (i.e Li = 5, 10, 15, 20, 40, 60, 80, 120, 160 um)? What do you suggest?

Here are some examples from the literature:

  • dimensions= 74 x 110 um^2; spacing= 3, 5, 10, 20, 36 um (Chen, Ke-Shian, et al. "A Cu-based alloyed Ohmic contact system on n-type GaAs." Applied Physics Letters 91.23 (2007))
  • dimensions= 100 x 100 um^2; spacing= 20 - 105 um; thickness= 30 nm (Khani, M., et al. "Transmission line model (TLM) method study of nanostructural AuGeNi/n-GaAs ohmic contact layer for different substrate deposition temperature." Electrical Engineering (ICEE), 2012 20th Iranian Conference on. IEEE, 2012.)
  • dimensions= 75 x 50 um^2; spacing= 2 - 11 um; temperature = 90 - 400 K   (Yamamoto, H., Z‐Q. Fang, and David C. Look. "Nonalloyed ohmic contacts on low‐temperature molecular beam epitaxial GaAs: Influence of deep donor band." Applied Physics Letters 57.15 (1990): 1537-1539.)
  • spacing= 0 - 30 um; Temperature= 25 - 300 K Wang, L. C., et al. ("An investigation of a nonspiking Ohmic contact to n-GaAs using the Si/Pd system." Journal of Materials Research 3.05 (1988): 922-930.)
  • width= 100 um; spacing= 5 - 40 um; thickness= ~1um Allen, L. H., et al. "Ohmic contacts to n‐GaAs using In/Pd metallization." Applied physics letters 51.5 (1987): 326-327.
  •  spacing=2, 3, 4, 8, 16, 32 um

    • (Wang, Yinghong, et al. "Research on rapid thermal annealing of ohmic contact to GaAs." Optoelectronics and Microelectronics (ICOM), 2012 International Conference on. IEEE, 2012.)

    More Duygu Can's questions See All
    Is it possible to re-activate silenced transgene at T1 rice plants to get T2 seeds which is expressing the transgene gene again ?

    I have three T0 plants (sblings) which were regenerated from same calli and expressing transgene simillar to actin level however when I analyze over 15 T1 plants I was not able to get any...

    13 October 2020 4,077 3 View

    Should I use z value (Mann-Kendall Test) or Qmed (Sen's slope)?

    I am writing my Phd thesis in which I try to make an indicator based assessment. My aim is to be able to compare provinces in terms of their index results. One of the indicators is temperature and...

    20 April 2020 5,965 2 View

    Where can I collect high-resolution records, like stalagmite records and tree-ring records?

    Dear scholars, I focus on the relationship between lake variation and paleoclimate change in the southern Tibet Plateau. And I want to collect some high-resolution records, like stalagmite...

    24 October 2019 5,239 1 View

    How can I solve nitrite oxide scavenging activity assay problem for plant extracts?

    Please help me to solve the problem of my experiment that nitrite oxide scavenging activity assay by using the Griess reagent and sodium nitroprusside. I get data from my experiment that...

    30 June 2019 7,859 2 View

    Is there any genomics company providing CAPP-Seq NGS analysis service for a research lab in Turkey?

    Hi everyone, I plan to perform CAncer Personalized Profiling by deep Sequencing (CAPP-Seq) for a cancer research project. Is there any available genome analysis company that uses Illumina Hiseq...

    09 February 2019 5,246 7 View

    How can I obtain time zero-point when laser beam and electron beam inject into one sample ?

    06 June 2018 7,824 1 View

    Does anybody works on EIS measurement in glucose or starch solution pH 5.2 on steel? what is the reason of "not balanced OCP "in these solutions?

    Electrochemistry impedance spectroscopy

    30 May 2018 4,652 3 View

    What should be ratio of each of plp1,plp2 and plp_vsvg packaging plasmids in transfection mix?

    Hi Currently i am using ratio of 1 ug pCMV-VSV-G to 9 ug pCMV-dR8.2 dvpr using pei to transfect HEK cells for lentivirus packaging . But i want to change it with plp1-plp2 -plp-vsvg...

    28 January 2018 3,338 3 View

    Could you please help me that how I can select a common seed at each run PROCESS MACRO?

    05 January 2018 5,510 2 View

    Is there anyone who measures the pH of the medium during Saccharomyces cerevisiae growth in caffeine conditions?

    Hello everyone, I am trying to answer some questions in my mind and I have to know what is the pH difference between start and stop point of growth of S. cerevisiae with caffeine. Thank you all.

    17 October 2017 9,722 2 View

    Similar questions and discussions
    Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

    In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

    03 March 2021 1,682 3 View

    Looking for Materials with high thermal expansion coefficient and high temperature resistance?

    03 March 2021 8,272 1 View

    Can we classify HV and LV lines based on line length?

    I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

    03 March 2021 4,116 4 View

    I need to image mesoporous silica nanoparticles that are in ~100 nm size and do high resolution TEM to look at mesopores. what grids should I use?

    Need to image mesoporous silica nanoparticles using the TEM. Also, need high resolution TEM images to see the mesoporous structure. Kindly suggest what kind of grids to use. Thanks, Shatadru

    02 March 2021 1,787 2 View

    Why are the velocities so high in my Boussinesq approximation Fluent simulation?

    Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

    02 March 2021 4,910 3 View

    12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

    Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

    02 March 2021 4,119 3 View

    Why almost every element would be metallized in sufficiently high pressure and low temperature?

    (This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

    02 March 2021 3,309 2 View

    New Journal, "Integrative Psychological and Behavioral Science" -- do you not know, and have you not seen, this done before?

    Question to you and THEM, the New Journal, "Integrative Psychological and Behavioral Science" -- do you not know, and have you not seen, this done before? There appears to be a core problem for...

    02 March 2021 3,024 2 View

    How optimize the Size Exclusion Chromatography?

    Hello! I'll do a size exclusion chromatography, but I only have an open column, and I'll perform the peptide extraction from yeast, using buffer lysis (sodium phosphate 50 mM/NaCl 30 mM/DNAse and...

    01 March 2021 2,215 2 View

    How to grow E.coli on the low salt LB agar plate with 50 or 100ug/ml of Blasticidin?

    Hello, I would like to ask how to grow E.coli which resists 50 or 100ug/ml of Blasticidin. I have tried many methods by using low salt Luria-Bertain(LB) agar plate. However, no colonies grow. Let...

    01 March 2021 2,027 2 View

    Our partners will collect data and use cookies for ad personalization and measurement. Learn how we and our ad partner Google, collect and use data. Agree & close