| Autor: |
Heinz Kalt, Alice Magin, Michael Hetterich, Moritz Schultes, Erik Ahlswede, Fabian Ruf, Meltem F. Aygüler, Pablo Docampo |
| Rok vydání: |
2018 |
| Předmět: |
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| Zdroj: |
2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC). |
| DOI: |
10.1109/pvsc.2018.8548225 |
| Popis: |
Temperature-dependent electromodulation spectroscopy is applied to perovskite solar cells for the determination of excitonic properties. Measurements have been performed on semitransparent (in transmission and reflection) and non-transparent devices (in reflection) as well as on cells with different absorber materials. The comparison with Elliott fits of standard absorption spectra enables a distinction between bound and continuum excitonic states and points towards bound electron-hole pairs as origin of the optical transitions observed in electromodulation spectra. The excitonic Sommerfeld enhancement leads to a significantly increased absorption in perovskites. Additionally, a comparison of multiple-cation mixed-halide perovskites with standard methylammonium lead iodide indicates a suppression of the phase transition at low temperatures. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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