DIPLOMARBEIT Development and Testing of a Sr-Measurement System for Integration in an existing vertical I-V-Measurement System

The aim of this work was to evaluate different methods for Sr-measurement and to develop and construct a measurement system which can be integrated inside a vertical I-Vmeasurement system and be used for the measurement of commercial sized PV-modules at AIT Austrian Institute of Technology GmbH. In addition the Sr-measurement system is supposed to perform a measurement according to the standard IEC 60904-8. The most promising possibilities for achieving quasi-monochromatic light are shortly discussed in this work. Afterwards the developed Sr-measurement system is introduced and the different components are explained. This system is based on optical bandpass filters, used for producing quasi monochromatic light and the lamp used for illumination is a Xenon flasher. Achieving a large area with homogeneous irradiation within ±2 % is impossible with this set-up as it is, only ±5 % can be achieved for large area modules. Very small modules can be measured under the strict conditions for homogeneity. In addition, leaking white light is disturbing the Spectral Response-measurement, thus overcoming any other measurement error. Therefore, the system can not yet be used for a serious Spectral Response-measurement and for measurements under normative regulations. However, this system is a first prototype which has to be and can be improved. Furthermore, this system has potential to be extended, e.g. for use with other PV-module technology such as multi-junction devices after installing coloured bias light.