An absolute differential spectral response measurement system for solar cells is presented. The system couples an array of light emitting diodes with an optical waveguide to provide large area illumination. Two unique yet complementary measurement methods were developed and tested with the same measurement apparatus. Good agreement was observed between the two methods based on testing of a variety of solar cells. The first method is a lock-in technique that can be performed over a broad pulse frequency range. The second method is based on synchronous multifrequency optical excitation and electrical detection. An innovative scheme for providing light bias during each measurement method is discussed.
Original Manuscript: May 4, 2012
Manuscript Accepted: May 24, 2012
Published: June 29, 2012
Behrang H. Hamadani, John Roller, Brian Dougherty, and Howard W. Yoon, "Versatile light-emitting-diode-based spectral response measurement system for photovoltaic device characterization," Appl. Opt. 51, 4469-4476 (2012)