Voltage-Dependent Photoluminescence and How It Correlates with the Fill Factor and Open-Circuit Voltage in Perovskite Solar Cells
- Optimizing the photoluminescence (PL) yield of a solar cell has long been recognized as a key principle to maximize the power conversion efficiency. While PL measurements are routinely applied to perovskite films and solar cells under open circuit conditions (V-OC), it remains unclear how the emission depends on the applied voltage. Here, we performed PL(V) measurements on perovskite cells with different hole transport layer thicknesses and doping concentrations, resulting in remarkably different fill factors (FFs). The results reveal that PL(V) mirrors the current-voltage (JV) characteristics in the power-generating regime, which highlights an interesting correlation between radiative and nonradiative recombination losses. In particular, high FF devices show a rapid quenching of PL(V) from open-circuit to the maximum power point. We conclude that, while the PL has to be maximized at V-OC at lower biases < V-OC the PL must be rapidly quenched as charges need to be extracted prior to recombination.
Author details: | Martin StolterfohtORCiDGND, Vincent M. Le CorreORCiD, Markus Feuerstein, Pietro CaprioglioORCiDGND, Lambert Jan Anton KosterORCiDGND, Dieter NeherORCiDGND |
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DOI: | https://doi.org/10.1021/acsenergylett.9b02262 |
ISSN: | 2380-8195 |
Title of parent work (English): | Acs energy letters |
Publisher: | American Chemical Society |
Place of publishing: | Washington |
Publication type: | Article |
Language: | English |
Year of first publication: | 2019 |
Publication year: | 2019 |
Release date: | 2020/09/27 |
Volume: | 4 |
Issue: | 12 |
Number of pages: | 11 |
First page: | 2887 |
Last Page: | 2892 |
Funding institution: | HyPerCells (graduate school of the Potsdam University); HyPerCells (HZB); Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)German Research Foundation (DFG) [423749265]; STW/NWOTechnologiestichting STWNetherlands Organization for Scientific Research (NWO) [VIDI 13476] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Peer review: | Referiert |