In this work, a new measurement setup for transient photoluminescence (TRPL) and
open-circuit voltage decay measurements was developed. Absolute calibration of the
photon detection system was performed, enabling the calculation of quasi-Fermi level
splitting decay. Analysing TRPL is inherently complex, and in the literature, a bi-
exponential fit is often employed, attributing the two decay components to slow radiative
and fast non-radiative recombination. However, this interpretation is highly simplified. In
this study, a more comprehensive model is applied, accounting for the distinct charge
carrier density dependencies of various recombination processes, as well as charge
exchange between the absorber and electrodes, and the capacitance associated with
the electrodes. This model provides a qualitative explanation of the observed PL decay
dynamics.
A systematic investigation of the impact of different perovskite solar cell layers on PL
decay identified non-radiative recombination via defects as the dominant recombination
pathway. Additionally, fully processed solar cells exhibited an exceptionally long 𝑉 oc
decay, which is attributed to the formation of ionic double layers at the interface between
the perovskite absorber and the charge transport layer.
Obermüller, Lea: Investigation of Charge Extraction and Recombination in Perovskite Solar Cells using Time-Resolved Photoluminescence Measurements. : 2025-02-25. DOI: https://doi.org/10.17192/openumr/643.
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