CsPbBr 3 Nanocrystals-Based Polymer Nanocomposite Films: Effect of Polymer on Spectroscopic Properties and Moisture Tolerance

Elisabetta Fanizza, Roberto Schingo, Annamaria Panniello, Angelica Maria Lanza, Nicoletta Depalo, Angela Agostiano, Maria Lucia Curri and Marinella Striccoli
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Elisabetta Fanizza: Dipartimento di Chimica, Università Degli Studi di Bari, Via Orabona 4, 70125 Bari, Italy
Roberto Schingo: Dipartimento di Chimica, Università Degli Studi di Bari, Via Orabona 4, 70125 Bari, Italy
Annamaria Panniello: CNR-IPCF, SS Bari, Via Orabona 4, 70125 Bari, Italy
Angelica Maria Lanza: Dipartimento di Chimica, Università Degli Studi di Bari, Via Orabona 4, 70125 Bari, Italy
Nicoletta Depalo: CNR-IPCF, SS Bari, Via Orabona 4, 70125 Bari, Italy
Angela Agostiano: Dipartimento di Chimica, Università Degli Studi di Bari, Via Orabona 4, 70125 Bari, Italy
Maria Lucia Curri: Dipartimento di Chimica, Università Degli Studi di Bari, Via Orabona 4, 70125 Bari, Italy
Marinella Striccoli: CNR-IPCF, SS Bari, Via Orabona 4, 70125 Bari, Italy

Energies, 2020, vol. 13, issue 24, 1-14

Abstract: Metal halide perovskites nanocrystals (NCs) represent an emerging class of materials that find increasing application in optoelectronic and photovoltaic devices, thanks to their intriguing optical properties, including high absorption coefficient, high fluorescence quantum yield (PL QY) and fast charge carrier separation. However, their opening to market is still hindered by their limited reliability, due to an intrinsic structural instability and degradation of their photophysical properties upon air, moisture, and light exposure. The incorporation of perovskite NCs in polymer matrix can limit some of the NC instability issues, with advantages in film processability, device fabrication and mechanical performance, being also useful for fundamental studies. In this regard, here, nanocomposites based on polymethylmethacrylate or polystyrene embedding all-inorganic CsPbBr 3 NCs have been prepared and processed in the form of flexible free-standing films. A systematic spectrofluorimetric study, comprising steady state photoluminescence (PL), PL quantum yield (QY) and PL decay of the free-standing films before and after exposure to relative humidity condition (RH% 85%, at 25 °C) is performed and discussed. Phase segregation phenomena, changes in NC passivation and recombination dynamics are evaluated as a function of polymer loading and its molecular structure and finally the efficacy of the polymer as moisture barrier investigated.

Keywords: CsPbBr 3 NCs; polymer nanocomposites; steady state emission; time resolved spectra; recombination dynamics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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