DOI: https://doi.org/10.29363/nanoge.almips.2021.004
Publication date: 23rd September 2021
Bulk lead halide perovskite thin films have emerged as efficient sensitizers for near-infrared-to-visible upconversion. The upconversion process is based on triplet-triplet annihilation in the annihilator rubrene. Their high absorption cross sections, long free carrier lifetimes and facile bandgap tunability are desirable for photovoltaic applications and are also expected to yield the requisite properties for perovskites to function as efficient triplet sensitizers. It has been well established that lead iodide perovskites of varying compositions are capable of sensitizing the triplet state of rubrene. However, to date, the exact mechanism of the triplet sensitization process is still under debate.
Our currently proposed mechanism is based on a simple charge transfer from the perovskite to the rubrene triplet state. However, the lack of noticeable perovskite photoluminescence quenching in the presence of rubrene supports a more intricate triplet sensitization mechanism. In particular, this highlights that only a small fraction of charges created in the perovskite upon photon absorption is extracted, despite the long-lived nature of free carriers. I will discuss the current view of the triplet sensitization mechanism and address the possible role of localized charge-transfer states, surface and bulk trap states, long-lived defect states or hot carriers.
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