Publication date: 17th February 2025
Our group developed photoluminescence (PL) measurement solutions addressing defect identification of organic PV (OPV) structures and devices. The photo-response of the absorber materials was investigated with dynamic and static PL measurements aiming the industrial application of these techniques.
The dynamics of the photo-response of the OPV samples were studied using Time Correlated Single Photon Counting (TCSPC) measurement technique. The unique feature of the TCSPC technique is to obtain the time-resolved fluorescence dynamics of molecular orbit transitions at extremely low injection conditions.
The luminescence decay characteristics featured very short decay components under 1 ns. Although the signal amplitude depends on the structural properties, but the evaluated decay time relates only to the given molecular specie of the absorber layer.
The industrially more important and viable technique is the PL imaging to detect malfunctions in layer deposition processes. The sophisticated optical design enables the roll-to-roll imaging PL characterization of organic PV structures.
The PL configuration using line cameras and recording PL images from large area samples was finally proven to provide outstanding quality and resolution images from all relevant organic layers. They clearly indicate the technique’s unique capability for real-time characterization of homogeneity issues in the layer deposition processes. The system optimization resulted in a fast-enough image capturing ensuring the easy adoption of the imaging PL technique in organic PV production lines.
This work was supported by Automated Manufacturing Production Line for Integrated Printed Organic Photovoltaics’ — ‘Flex2Energy’. Grant Agreement number: 101096803 — Flex2Energy — HORIZON-CL5-2022-D3-01 a Horizon Europe Framework Programme (HORIZON).
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