DOI: https://doi.org/10.29363/nanoge.emlem.2022.056
Publication date: 15th July 2022
Photon recycling (PR) is an outstanding physical process that consists on the reabsorption and re-emission of radiatively emitted photons in semiconductor thin films. These multiple reabsorption/reemission cycles can significantly increase the photon and carrier densities in solar cells or light-emitting sources, hence it has important implications towards the enhancement of the performances of these devices (Ansari-Rad & Bisquert, 2018). In this context, perovskite materials present optimum characteristics to favor the PR effect (Pazos-Outón et al., 2016); namely large absorption coefficient and sharp edge, together with relatively narrow photoluminescence (PL) spectra, short Stokes-shift (SS) between exciton PL and absorption, and high PL quantum yield. In this scenario, we have recently demonstrated a record of PR effect by integrating a close packed layer of CsPbBr3 NCs on a planar waveguide configuration (PMMA/perovskite/PMMA). The advantage of this geometry, compared to the case of a standard thin film, is the high confinement of the electromagnetic field at the semiconductor and, with it, the important enhancement of the exciton absorption and emission processes. As a consequence, this photonic device extended the PR effect over mm-distances, as revealed by the SS of the collected PL up to 32.5 meV and the increase of the decay time from 3 to 9 ns (see figure). In this talk we will compare and discuss the PR effect observed in optical waveguides incorporating films of CsPbBr3 nanocrystals (3D carrier confinement) and PEA2SnI4 (1D carrier confinement). The PR effect was appropriately characterized by a frequency-domain fluorescence spectroscopy technique, and modelled with rate equations and stochastic Monte Carlo simulations in the case of perovskite nanocrystals (J. Navarro et al., 2020), where carrier diffusion is absent. In the case of the 2D tin-perovskite, we evaluate the effect of diffusion in the waveguided PR mechanism. Our results provide new insights towards a deeper understanding of the PR phenomenon, whose significance could be extended for designing and optimizing the PR effect in solar cells and light-emitting devices.
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 862656 (project DROP-IT) and European Research Council (ERC) via Consolidator Grant (724424, No-LIMIT), by the Spanish MICINN through projects no. PID2020-120484RB, PID2019-107348GB-100, PID2019-107314RB-I00 and the national network of excellence PEROVSKITAS, and by Generalitat Valenciana (Spain) under projects PROMETEO/2018/098 and PROMETEO/2020/028. J.N.-A. also acknowledges the Spanish MINECO for his Ph.D. Grant No. BES-2015-074014.
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