Abstract
The contributions of each subcell to the total photoluminescence (PL) spectrum of a monolithic perovskite/silicon tandem solar cell are distinguished using a variable wavelength excitation laser source. In the results, a strong overlap of the PL spectrum is shown, originating from the sub-bandgap region of the perovskite top cell with the emission from the silicon bottom cell, even with near-infrared excitation wavelengths. Consequently, an excitation laser wavelength of at least 815 nm is required for a dominant PL signal from the silicon bottom cell, and a wavelength no longer than 750 nm is needed for a dominant PL signal from the perovskite top cell in the investigated tandem solar cell. Moreover, a shoulder in the sub-bandgap emission of the perovskite top cell almost coincides with the PL response region of the silicon bottom cell, which can cause signal confusion in subcell characterization.
Original language | American English |
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Journal | Solar RRL |
DOIs | |
State | Published - 2024 |
NREL Publication Number
- NREL/JA-5K00-92552
Keywords
- perovskites
- photoluminescence
- spectroscopy