Publication date: 11th March 2026
Organic solar cells (OSCs) offer a lightweight, flexible alternative to silicon photovoltaics, with advantages such as low environmental impact and high mechanical conformability. However, their lower efficiency and stability remain key challenges, requiring advanced characterization techniques to guide material and device optimisation.
Raman spectroscopy provides exceptional chemical specificity and is routinely used to obtain information about the various power efficiency-influencing properties of silicon, cadmium telluride, perovskite, III-V semiconductor, quantum dot, and organic cells. Combined with confocal microscopy, Raman spectroscopy enables micron-resolution imaging of material properties across a cell. Additionally, Raman microscopes can be configured for photoluminescence (PL) imaging; an industry standard for photovoltaic quality control. By further integrating a photocurrent imaging upgrade with the Confocal Raman Microscope, we can directly correlate Raman, PL and cell performance across a device.
This presentation will demonstrate Raman, PL, and photocurrent imaging of the same area on an OSC using an Edinburgh Instruments RM5 Confocal Raman Microscope. This correlative spectral and photocurrent imaging methodology is a powerful tool in the photovoltaic industry because it allows for an enhanced understanding of the properties of solar cells, their defects and degradation over time.
We would like to thank Bahattin Bademci and Dr Tariq Sajjad from the TEMD Research Group at London South Bank University for providing the OSC used in this work.
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