Photon recycling in CsPbBr3 All-Inorganic Perovskite Nanocrystals
van der Laan, Marco (University of Amsterdam. Institute of Physics)
de Weerd, Chris (University of Amsterdam. Institute of Physics)
Poirier, Lucas (University of Amsterdam. Institute of Physics)
van de Water, Oscar (University of Amsterdam. Institute of Physics)
Poonia, Deepika (Delft University of Technology. Department of Chemical Engineering)
Gomez, Leyre (Institut Català de Nanociència i Nanotecnologia)
Kinge, Sachin (Delft University of Technology. Department of Chemical Engineering)
Siebbeles, Laurens D. A. (Delft University of Technology. Department of Chemical Engineering)
Koenderink, A. Femius (University of Amsterdam. Institute of Physics)
Gregorkiewicz, Tom (University of Amsterdam. Institute of Physics)
Schall, Peter (University of Amsterdam. Institute of Physics)

Data:	2021
Resum:	Photon recycling, the iterative process of re-absorption and re-emission of photons in an absorbing medium, can play an important role in the power-conversion efficiency of photovoltaic cells. To date, several studies have proposed that this process may occur in bulk or thin films of inorganic lead-halide perovskites, but conclusive proof of the occurrence and magnitude of this effect is missing. Here, we provide clear evidence and quantitative estimation of photon recycling in CsPbBr nanocrystal suspensions by combining measurements of steady-state and time-resolved photoluminescence (PL) and PL quantum yield with simulations of photon diffusion through the suspension. The steady-state PL shows clear spectral modifications including red shifts and quantum yield decrease, while the time-resolved measurements show prolonged PL decay and rise times. These effects grow as the nanocrystal concentration and distance traveled through the suspension increase. Monte Carlo simulations of photons diffusing through the medium and exhibiting absorption and re-emission account quantitatively for the observed trends and show that up to five re-emission cycles are involved. We thus identify 4 quantifiable measures, PL red shift, PL QY, PL decay time, and PL rise time that together all point toward repeated, energy-directed radiative transfer between nanocrystals. These results highlight the importance of photon recycling for both optical properties and photovoltaic applications of inorganic perovskite nanocrystals.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Optoelectronics ; Perovskite nanocrystals ; Photon recycling ; Photoluminescence ; Monte Carlo simulation
Publicat a:	ACS Photonics, Vol. 8, Issue 11 (November 2021) , p. 3201-3208, ISSN 2330-4022

DOI: 10.1021/acsphotonics.1c00953
PMID: 34820474

8 p, 2.7 MB

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