Investigating and Improving Performance Ratio of Cu(In,Ga)(S,Se)2 Photovoltaic Devices

Weber A, Lechner R, Grünsteidl S, Borowski P, Schubbert C, Dalibor T, Heise SJ, Ohland J, Savchenko I, Ahmed H, Hirwa H, Parisi J, Klenk R, Reyes-Figueroa P, Farias Basulto G, Aghaei M, Ulbrich C, Waack E, Hock R, Dallmann J, Künecke U, Schuster M, Wellmann P (2020)

Publication Language: English

Publication Type: Conference contribution, Abstract of a poster

Publication year: 2020

Event location: Marseille FR


For a commercial photovoltaic product not only the efficiency under standard test conditions (1000 W/m², AM1.5, Tcell=25°C) but also the performance under different operating conditions in the field is of importance. In this contribution, first results and the current status of a new project for Yield maximized Cu(In,Ga)(S,Se)2 thin film solar modules by deliberately controlled parameters of performance ratio (MyCIGS)2 are presented. In a comprehensive approach MyCIGS covers the combination of material and process variations in the different device layers, material characterisation of these layers, opto-electrical characterisation of the resulting devices, device and performance simulation and finally outdoor module testing to identify and optimize the key contributors for the performance ratio. With Avancis and the Helmholtz-Zentrum Berlin, the MyCIGS project comprises two partners that can supply completely processed cell or module samples or the single layers starting from the back electrode and thus allowing for a large field of possible process and material variations. Material characterisation is done by all project partners with a focus at the University of Erlangen on absorber characterisation via X-ray diffraction, scanning electron microscopy and photoluminescence. With the various characterisation techniques the absorber composition and its grading with absorber thickness, quality of module patterning, optical properties and electrical properties of the complete device are investigated. Material and device characterisation are the basis for a TCAD3 device model by the University of Oldenburg to also allow for a simulation-based approach to optimise the different contributors to performance ratio. The impact of the tested process variations on the parameters of performance ratio is tested indoor and also outdoor on two newly installed field test setups in Munich and Berlin. In a first experimental series, various process parameters have been investigated: composition of the back electrode, composition of the absorber (Ga-poor and S-poor versus Ga-rich and S-rich), buffer material and ilayer. In this contribution we will show the results of the absorber variation in more detail.

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Weber, A., Lechner, R., Grünsteidl, S., Borowski, P., Schubbert, C., Dalibor, T.,... Wellmann, P. (2020, October). Investigating and Improving Performance Ratio of Cu(In,Ga)(S,Se)2 Photovoltaic Devices. Poster presentation at EU PVSEC, Marseille, FR.


Weber, Alfons, et al. "Investigating and Improving Performance Ratio of Cu(In,Ga)(S,Se)2 Photovoltaic Devices." Presented at EU PVSEC, Marseille 2020.

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