title: Differential spectral responsivity measurement of photovoltaic detectors with a light-emitting-diode-based integrating sphere source.
abstract: We present an experimental realization of differential spectral responsivity measurement by using a light-emitting diode (LED)-based integrating sphere source. The spectral irradiance responsivity is measured by a Lambertian-like radiation field with a diameter of 40 mm at the peak wavelengths of the 35 selectable LEDs covering a range from 280 to 1550 nm. The systematic errors and uncertainties due to lock-in detection, spatial irradiance distribution, and reflection from the test detector are experimentally corrected or considered. In addition, we implemented a numerical procedure to correct the error due to the broad spectral bandwidth of the LEDs. The overall uncertainty of the DSR measurement is evaluated to be 2.2% (k = 2) for Si detectors. To demonstrate its application, we present the measurement results of two Si photovoltaic detectors at different bias irradiance levels up to 120 mW/cm(2).
authors.affiliation: Science of Measurement Department, University of Science and Technology, 217 Gajung-ro, Yuseong-gu, Daejeon 305-350, South Korea.
authors.forename: Ghufron
authors.initials: G
authors.lastname: Zaid
authors.forename: Seung-Nam
authors.initials: SN
authors.lastname: Park
authors.forename: Seongchong
authors.initials: S
authors.lastname: Park
authors.forename: Dong-Hoon
authors.initials: DH
authors.lastname: Lee