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Author: Behrang Hamadani

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1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. Towards realization of a large-area, LED-based solar simulator
Published: 11/27/2011
Authors: Behrang H Hamadani, Kangbin Chua, John F Roller, Howard W Yoon, Brian P Dougherty
Abstract: LED-based solar simulators have shown great promise as alternative light sources for indoor testing of PV cells as compared to their traditional counterparts. However, large-area uniform illumination more suitable for larger cells and module measurem ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908797

10. Imaging of nanoscale charge transport in bulk heterojunction solar cells
Published: 6/17/2011
Authors: Behrang H Hamadani, Nadine Emily Gergel-Hackett, Paul M Haney, Nikolai B Zhitenev
Abstract: We have studied the local charge transport properties of organic bulk heterojunction solar cells based on the blends of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) with a photoconductive atomic force microscope (PCAF ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905890



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