2016-03-01
Photon recycling in lead iodide perovskite solar cells
Publication
Publication
Science , Volume 351 - Issue 6280 p. 1430- 1433
Lead-halide perovskites have emerged as high-performance photovoltaic materials. We mapped the propagation of photogenerated luminescence and charges from a local photoexcitation spot in thin films of lead tri-iodide perovskites. We observed light emission at distances of ≥50 micrometers and found that the peak of the internal photon spectrum red-shifts from 765 to ≥800 nanometers. We used a lateral-contact solar cell with selective electron- and hole-collecting contacts and observed that charge extraction for photoexcitation >50 micrometers away from the contacts arose from repeated recycling between photons and electron-hole pairs. Thus, energy transport is not limited by diffusive charge transport but can occur over long distances through multiple absorption-diffusion-emission events. This process creates high excitation densities within the perovskite layer and allows high open-circuit voltages.
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AAAS | |
doi.org/10.1126/science.aaf1168 | |
Science | |
LMPV | |
Organisation | Hybrid Solar Cells |
Pazos-Outón, L., Szumilo, M., Lamboll, R., Richter, J. M., Crespo-Quesada, M., Abdi-Jalebi, M., … Deschler, F. (2016). Photon recycling in lead iodide perovskite solar cells. Science, 351(6280), 1430–1433. doi:10.1126/science.aaf1168 |