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Author: David Gundlach

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1. Predicting the J-V Curve in Organic Photovoltaics Using Impedance Spectroscopy
Published: 6/2/2014
Authors: James Ian 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 ...

2. 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 ...

3. 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 ...

4. 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 Ian 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 ...

5. Band Offset Determination of Atomic-Layer-Deposited Al2O3 and HfO2 on InP by Internal Photoemission and Spectroscopic Ellipsometry
Published: 1/9/2013
Authors: Kun Xu, Oleg A Kirillov, David J Gundlach, Nhan V Nguyen, Pei D Ye, Min Xu, Lin Dong, Hong Sio
Abstract: Band offsets at the interfaces of n- and p-type InP ((100) and (111)A) and atomic-layer-deposited (ALD) Al2O3 were measured with internal photoemission and spectroscopic ellipsometry. Similarly, the band offsets at the interface of semi-insulatin ...

6. Observation of spin-valve effect in Alq3 using a low work function metal
Published: 9/7/2012
Authors: Hyuk-Jae Jang, Kurt Pernstich, David J Gundlach, Oana Jurchescu, Curt A Richter
Abstract: We present the observation of magnetoresistance in Co/Ca/Alq3/Ca/NiFe spin-valve devices. Thin Ca layers contacting 150 nm thick Alq3 enable the injection of spin-polarized electrons into Alq3 due to engineering of the band alignment. The devices ex ...

7. Determination of graphene work function and graphene-insulator-semiconductor band alignment by internal photoemission spectroscopy
Published: 7/11/2012
Authors: Rusen Yan, Qin Q. Zhang, Wei Li, Irene G. Calizo, Tian T. Shen, Curt A Richter, Angela R Hight Walker, Xuelei X. Liang, David J Gundlach, Nhan V Nguyen, Huili Grace Xing, Alan Seabaugh
Abstract: We determined the band alignment of a graphene-oxide-silicon structure using internal photoemission spectroscopy. From the flatband voltage and Dirac voltage we infer a 4.3  10e11 cm-2 negative extrinsic charge present on the graphene surface. Als ...

8. Measuring domain sizes and compositional heterogeneities in P3HT-PCBM bulk heterojunction thin films with 1H spin diffusion NMR spectroscopy
Published: 3/21/2012
Authors: Ryan C Nieuwendaal, Hyun W. Ro, David Germack, Regis J Kline, Calvin Chan, Amit Kumar Agrawal, David J Gundlach, David Lloyd VanderHart, Dean M DeLongchamp
Abstract: In this manuscript we show that 1H spin diffusion NMR is a valuable method for estimating the domain sizes in thin films of a polymer-fullerene blend for bulk heterojunction (BHJ) photovoltaics. Variations in common BHJ film processing parameters hav ...

9. Flip Chip Lamination to electrically contact organic single crystals on flexible substrates
Published: 4/20/2011
Authors: Oana Jurchescu, Brad Conrad, Christina Ann Hacker, David J Gundlach, Curt A Richter
Abstract: The fabrication of top metal contacts for organic electronics represents a challenge and has important consequences for electrical properties of such systems. We report a low cost and non-destructive printing process, Flip Chip Lamination (FCL), to f ...

10. Controlling the Microstructure of Solution-Processible Small Molecules in Thin-Film Transistors through Substrate Chemistry
Published: 2/4/2011
Authors: Regis J Kline, Steven D Hudson, Xinran Zhang, David J Gundlach, Andrew Moad, Lee J Richter, Oana Jurchescu, Thomas Jackson, Sanker Subramanian, John E Anthony, Michael F. Toney
Abstract: Solution-processible small molecules have tremendous potential for providing both high charge carrier mobility and low cost processing. This study outlines a detailed microstructural study of the effect of substrate chemistry on fluorinated 5,11-bis ...

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