Photon recycling in lead iodide perovskite solar cells
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 t...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2016-03, Vol.351 (6280), p.1430-1433 |
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| creator | Pazos-Outón, Luis M. Szumilo, Monika Lamboll, Robin Richter, Johannes M. Crespo-Quesada, Micaela Abdi-Jalebi, Mojtaba Beeson, Harry J. Vrućinić, Milan Alsari, Mejd Snaith, Henry J. Ehrler, Bruno Friend, Richard H. Deschler, Felix |
| description | 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. |
| doi_str_mv | 10.1126/science.aaf1168 |
| format | Article |
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| language | eng |
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| source | Science Magazine; JSTOR Archive Collection A-Z Listing |
| subjects | Atoms & subatomic particles Materials science Photovoltaic cells |
| title | Photon recycling in lead iodide perovskite solar cells |
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