Two examples are the problems of measuring devices with high cell capacitances such as high efficiency silicon devices or the inability of single source simulators to calibrate multi-junction devices. INTRODUCTION Fast developing research in solar cells and modules leads to growing complexity in device structures which also introduces new challenges in supposedly basic current-voltage characterisation of devices. Keywords: Light emitting diode, LED, solar simulator, calibration, classification, measurement 1. The usage of LEDs can enhance today s characteristic measurement functions and even opens possibilities to fully characterise solar cells indoors within a much shorter time than is possible today, over a range of conditions previously only available through outdoor characterisation. Combined with the life expectancy exceeding h, LEDs are a strong candidate for solar simulator light sources introducing a significant improvement in calibration lifetime as well as significantly reduced running cost. LEDs can be controlled very fast within microseconds or operated continuously, combining a steady state and a flash solar simulator with additional functions such as variable flash frequencies and flash shape. The ability to keep LEDs stable for a long time and dim them with minimal changes in the spectrum allows generation of a spectrum closely matched to AM1.5G standard test spectrum or indeed even realistic variations of the outdoor spectrum. This paper presents the advantages of this lighting technology for solar simulation and backs these up through results of the prototype unit developed at the Centre for Renewable Energy Systems Technology. LEDs offer an additional degree of freedom, when using an appropriate combination of wavelengths. This is due to the light sources used in current simulators. While the output spectrum of some solar simulators is adjustable, generally only light intensity and module temperature can be varied. Gottschalg Centre for Renewable Energy Systems Technology (CREST), Department of Electronic and Electrical Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK ABSTRACT Advances in photovoltaic technology resulted in increased complexity of device calibration, largely being affected by deviations of test spectrum from natural spectra. Full details of this licence are available at: Please cite the published version.ΔΆ ADVANTAGES IN USING LEDS AS THE MAIN LIGHT SOURCE IN SOLAR SIMULATORS FOR MEASURING PV DEVICE CHARACTERISTICS M.Bliss *, T.R. Metadata Record: Version: Accepted for publication Publisher: c SPIE Rights: This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. One print or electronic copy may be made for personal use only. Copyright 2008 Society of Photo-Optical Instrumentation Engineers. Reliability of Photovoltaic Cells, Modules, Components, and Systems, Proceedings of SPIE 7048, paper Additional Information: This paper was delivered at the Conference on Reliability of Photovoltaic Cells Modules, Components, and Systems, San Diego, CA. and GOTTSCHALG, R., Advantages in using LEDS as the main light source in solar simulators for measuring PV device characteristics. 1 Loughborough University Institutional Repository Advantages in using LEDS as the main light source in solar simulators for measuring PV device characteristics This item was submitted to Loughborough University's Institutional Repository by the/an author.
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