ABSTRACT
A new approach in I-V-curve tracing based upon a continuous water-vortex high-pressure arc lamp is presented in this paper. Some key characteristics of this system are: customized spectrum (e.g. AM0 or AM 1.5 compliant), continuously adjustable irradiance levels, suitability for cleanroom environments and vacuum applications. Pulse widths from 250 ms to continuous are achieved over a target area of a typical size of approximately 3 m x 4 m. It is shown that both spectral as well as spatial and temporal characteristics comply with the high standards that are common in the space industry. The new measurement technique is made possible by using a flexible long pulse to continuous radiation signal. The ability to vary pulse lengths avoids limitations encountered by traditional I-V-curve measurement methods. Data is taken using a specifically designed load cell that holds constant voltage across the sample while modulating the intensity around the requested cell irradiance. Current and voltage are analyzed as a function of irradiance to extract accurate I-V-data at the requested irradiance level. Transient effects due to cell capacitance as well as interconnect capacitance and inductance can be measured by altering sweep rates. Results for a number of different types of solar cells/panels are presented.
