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 and tested with the same measurement apparatus on a variety of solar cells. The first method is an individual LED lock-in technique that can be performed over a broad frequency range. The second method is based on synchronous multi-frequency optical excitation, called the Fourier transform (FT) technique, using the LEDs and detection with a spectrum analyzer. A scheme for providing light bias using the LEDs during either measurement scheme is discussed.
Proceedings Title: Proceedings of the 39th IEEE Photovoltaics Specialists Conference, June 16-21, 2013, Tampa, FL.
Conference Dates: June 16-21, 2013
Conference Location: Tampa, FL
Conference Title: 39th IEEE PV Specialist Conference
Pub Type: Conferences
solar cells, spectral responsivity, light emitting diodes, Fourier transform