Raman spectroscopy and photoluminescence imaging for predictive quality monitoring of CIGS solar cells

Martin De Biasio; Johanna Zikulnig; Wolfgang Muehleisen; Marcel Simor; Pieter J. Bolt

doi:10.1117/12.2618766

31 May 2022 Raman spectroscopy and photoluminescence imaging for predictive quality monitoring of CIGS solar cells

Martin De Biasio, Johanna Zikulnig, Wolfgang Muehleisen, Marcel Simor, Pieter J. Bolt

Proceedings Volume 12098, Dimensional Optical Metrology and Inspection for Practical Applications XI; 120980I (2022) https://doi.org/10.1117/12.2618766
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Conference Poster

Abstract

Novel thin-film solar cells based on Copper Indium Gallium Selenide (CIGS) are an alternative to standard crystalline silicon cells. This work tests whether two proposed optical methods: Micro-Raman spectroscopy (RS) and photoluminescence (PL) imaging, can measure quality parameters of CIGS PV plates during their manufacture. The investigation followed three steps. Step 1: semi-finished CIGS cells were deposited on a soda-lime glass carrier and measured with Raman and PL. The test cells consisted of a Molybdenum (Mo) back contact, a CIGS layer (varied in the absorber thickness), and a CdS layer. The measurements were used to train models for predictive quality monitoring. Step 2: the plates were finished by adding an iZnO buffer layer, ZnO:Al (AZO) front electrode and divided into 32 cells by scribing down to the Mo layer and electrically tested. I-V parameters such as the open circuit voltage V_OC, shunt resistance Rsh, and EQE were measured. Step 3: the finished cells were again measured using the two proposed methods to estimate the composition, efficiency, and V_OC of the thin-film cells. Our results show that the proposed methods can non-destructively predict the absorber composition and cell electrical parameters and can therefore be used to exclude samples with poor cell performance at an early production stage.

Conference Presentation

Citation Download Citation

Martin De Biasio, Johanna Zikulnig, Wolfgang Muehleisen, Marcel Simor, and Pieter J. Bolt "Raman spectroscopy and photoluminescence imaging for predictive quality monitoring of CIGS solar cells", Proc. SPIE 12098, Dimensional Optical Metrology and Inspection for Practical Applications XI, 120980I (31 May 2022); https://doi.org/10.1117/12.2618766

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