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You searched on: Author: Behrang Hamadani

Displaying records 1 to 10 of 34 records.
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1. Nonlinearity measurements of solar cells with an LED-based combinatorial flux addition method
Published: 1/13/2016
Authors: Behrang H Hamadani, Andrew M. Shore, John F Roller, Howard W Yoon, Mark Campanelli
Abstract: We present a light emitting diode (LED)-based system utilizing a combinatorial flux addition method to investigate the nonlinear relationship in solar cells between the output current of the cell and the incident irradiance level. The magnitude of th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919046

2. Solar cell characterization
Published: 10/23/2015
Authors: Behrang H Hamadani, Brian P Dougherty
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915586

3. Large-area irradiance-mode spectral response measurements of solar cells by a light-emitting-diode- based integrating sphere source
Published: 5/30/2014
Authors: Behrang H Hamadani, John F Roller, Andrew M. Shore, Brian P Dougherty, Howard W Yoon
Abstract: An irradiance-mode absolute differential spectral response measurement system based on a light emitting diode (LED) array is described. The LEDs are coupled to an integrating sphere whose output irradiance is uniform to better than 2 % over an ar ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915298

4. Fast and Reliable Spectral Response Measurements of PV Cells Using Light Emitting Diodes
Published: 1/1/2014
Authors: Behrang H Hamadani, John F Roller, Brian P Dougherty, Howard W Yoon
Abstract: We present a measurement system for absolute differential spectral responsivity of solar cells based on high-powered LED arrays coupled to an optical light guide capable of large area illumination. Two different measurement techniques were developed ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913952

5. Local electrical characterizations of cadmium telluride solar cells using low energy electron beam
Published: 10/1/2013
Authors: Heayoung Yoon, Paul M Haney, Dmitry Alexandrovich Ruzmetov, Hua Xu, Marina S. Leite, Behrang H Hamadani, Albert A. Talin
Abstract: We investigate local electronic properties of cadmium telluride solar cells using electron beam induced current (EBIC) measurements with current-collecting patterned contacts. EBIC measurements are performed with a spatial resolution as high as ͭ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911828

6. Absolute spectral responsivity measurements of solar cells by a hybrid optical technique
Published: 7/15/2013
Authors: Behrang H Hamadani, John F Roller, Brian P Dougherty, Fiona Persaud, Howard W Yoon
Abstract: An irradiance mode, absolute differential spectral response measurement system for solar cells is presented. The system is based on combining the monochromator-based approach of determining the power mode spectral responsivity of cells with an LED-b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913725

7. Imaging of nanoscale photogenerated charge transport in organic photovoltaic materials
Published: 5/27/2013
Authors: Nikolai B Zhitenev, Behrang H Hamadani, Paul M Haney
Abstract: Photogenerated charge transport in bulk heterojunction (BHJ) solar cells is strongly dependent on the active layer nanomorphology. Local probes have been extensively employed to understand the correlation between 2D and 3D morphology and device effic ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911136

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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912092

9. High-Resolution Local Current Measurement of CdTe Solar Cells
Published: 10/4/2012
Authors: Heayoung Yoon, Dmitry Alexandrovich Ruzmetov, Paul M Haney, Marina S. Leite, Behrang H Hamadani, Albert A. Talin, Nikolai B Zhitenev
Abstract: We investigate local electronic properties of CdTe solar cells using electron beam to excite electron-hole pairs and evaluate spatially resolved photocurrent characteristics. Standard semiconductor processes were used to fabricate Ohmic metal contact ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911447

10. A versatile light-emitting-diode-based spectral response measurement system for photovoltaic device characterization
Published: 6/29/2012
Authors: Behrang H Hamadani, John F Roller, Brian P Dougherty, Howard W Yoon
Abstract: An absolute differential spectral response measurement system for solar cells is presented. The system couples an array of light emitting diodes (LEDs) with an optical waveguide to provide large area illumination. Two unique yet complementary measur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910849



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