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You searched on: Author: David Gundlach

Displaying records 1 to 10 of 65 records.
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1. Influence of Metal¿MoS2 Interface on MoS2 Transistor Performance: Comparison of Ag and Ti Contacts
Published: 12/16/2014
Authors: Hui H. Yuan, Guangjun Cheng, Lin You, Haitao Li, Hao Zhu, wei li, Joseph J Kopanski, Yaw S Obeng, Angela R Hight Walker, David J Gundlach, Curt A Richter, D. E Ioannou, Qiliang Li
Abstract: In this work, we present a study of enhancing MoS2 transistor performance by using proper metal contact. We found that the on-state current of MoS2 field-effect transistors with 30 nm Au/ 30 nm Ag contacts is enhanced more than 60 times and the subth ...

2. Broad Band Optical Properties of Large Area Monolayer CVD Molybdenum Disulfide
Published: 11/21/2014
Authors: wei li, Glen Birdwell, Matin Amani, Yi-Hsien Lee, Ling Xi, Xuelei Liang, Lianmao Peng, Curt A Richter, Kong Jing, David J Gundlach, Nhan V Nguyen

3. Interface Engineering to Control Magnetic Field Effects of Organic-Based Devices by Using a Molecular Self-Assembled Monolayer
Published: 6/26/2014
Authors: Hyuk-Jae Jang, Sujitra Jeanie Pookpanratana, Alyssa N. Brigeman, Regis J Kline, James I. Basham, David J Gundlach, Christina Ann Hacker, Oleg A Kirillov, Oana Jurchescu, Curt A Richter
Abstract: Organic semiconductors hold immense promise for the development of a wide range of innovative devices with their excellent electronic and manufacturing characteristics. Of particular interest are non-magnetic organic semiconductors that show unusual ...

4. Probing charge recombination dynamics in organic photovoltaic devices at open circuit conditions
Published: 6/12/2014
Authors: Lindsay Cc Elliott, James I. Basham, Kurt Pernstich, Pragya Rasmi Shrestha, Lee J Richter, Dean M DeLongchamp, David J Gundlach

5. Morphological origin of charge transport anisotropy in aligned polythiophene thin films
Published: 6/11/2014
Authors: Brendan T. O'Connor, Obadiah G. Reid, Xinran Zhang, Regis J Kline, Lee J Richter, David J Gundlach, Dean M DeLongchamp, Michael F. Toney, Nikos Kopidakis, Garry Rumbles
Abstract: The morphological origin of anisotropic charge transport in uniaxially strain aligned poly(3-hexylthiophene) (P3HT) films is investigated. The macroscale field effect mobility anisotropy is measured in an organic thin film transistor (OTFT) configura ...

6. Predicting the J-V Curve in Organic Photovoltaics Using Impedance Spectroscopy
Published: 6/2/2014
Authors: James I. Basham, Thomas N Jackson, David J Gundlach
Abstract: We employ impedance spectroscopy as a method to predict the current-voltage curve in organic photovoltaics. This technique allows the quantification of the recombination rate, series resistance, carrier density and lifetime very close to normal oper ...

7. Highly reproducible and reliable metal/graphene contact by UV-Ozone treatment
Published: 3/17/2014
Authors: wei li, Christina Ann Hacker, Guangjun Cheng, Angela R Hight Walker, Curt A Richter, David J Gundlach, Yiran Liang, boyuan Tian, Xuelei Liang, Lianmao Peng
Abstract: Resist residue from the device fabrication process is a significant source of contamination at the metal/graphene contact interface. Ultraviolet Ozone (UVO) treatment is proven here, by X-ray photoelectron spectroscopy (XPS) and Raman measurement ...

8. Modulated photocurrent spectroscopy of CdTe/CdS solar cells-equivalent circuit analysis
Published: 5/20/2013
Authors: Behrang H Hamadani, John F Roller, Kounavis Panagiotis, Nikolai B Zhitenev, David J Gundlach
Abstract: We have used the technique of photocurrent modulated spectroscopy to investigate the dynamic response of charge carrier transport in thin film CdTe/CdS solar cells as a function of light bias and temperature over a broad excitation frequency range. T ...

9. UV/Ozone treatment to reduce metal-graphene contact resistance
Published: 5/8/2013
Authors: wei li, Kurt Pernstich, Angela R Hight Walker, Tian T. Shen, Guangjun Cheng, Christina Ann Hacker, Curt A Richter, Qiliang Li, David J Gundlach, Xuelei Liang, Lianmao Peng, Yiran Liang

10. Graphene as Transparent Electrode for Direct Observation of Hole Photoemission from Silicon to Oxide
Published: 3/27/2013
Authors: Rusen Yan, Qin Q. Zhang, Oleg A Kirillov, wei li, James I. Basham, Alexander George Boosalis, Xuelei X. Liang, Debdeep Jena, Curt A Richter, Alan C. Seabaugh, David J Gundlach, Huili G. Xing, Nhan V Nguyen
Abstract: The outstanding electrical and optical properties of graphene make it an excellent alternative as a transparent electrode. Here we demonstrate the application of graphene as collector material in internal photoemission (IPE) spectroscopy; enabling th ...

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