Stabilizing the black-Phase of CsPbI3 Perovskite by crystallization kinetics modulation.
Francesca Russo a d, Elisabetta Fanizza a, Francesco Fracassi a c, Aurora Rizzo b, Andrea Listorti a, Silvia Colella c
a Dipartimento di Chimica, Università degli Studi di Bari “Aldo Moro”, Via Orabona 4, 70126 Bari, Italy
b CNR NANOTEC – Istituto di Nanotecnologia, c/o Campus Ecotekne, Via Monteroni, 73100 Lecce, Italy
c CNR NANOTEC - c/o Dipartimento di Chimica, Università degli Studi di Bari “Aldo Moro”, Via Orabona 4, 70126 Bari, Italy
d Dipartimento di Ingegneria Elettrica e dell’Informazione, Politecnico di Bari, Via Orabona 4, 70126 Bari, Italy
Poster, Francesca Russo, 028
Publication date: 3rd April 2023

All-inorganic cesium lead iodide (CsPbI3) perovskite exhibits excellent prospects for commercial application as a light absorber in efficient wide-bandgap perovskite solar cells due to its superior thermal stability and photoelectric properties compared with organic-inorganic-hybrid perovskite counterparts. However, such a promise it is blurred by the poor structural stability of the black-phase (α, β, and γ) CsPbI3, as it can spontaneously transform into photoinactive δ-phase at room temperature and this process can be accelerated by the ambient moisture, leading to low PCE [1]. In this regard, the fabrication of high-quality CsPbI3 perovskite films is regarded as an essential pathway for effectively boosting the PCE and simultaneously enhancing the perovskite phase structure stability. Previous calculations suggested that the [PbI6] 4− inter-octahedral tilt had a large influence on the formation energies of the three perovskite phases (α, β, and γ) of CsPbI3 [2]. To obtain a stable photoactive perovskite, controlling the crystallization process, in terms of the nucleation and growth, and reducing the distortion of loosening octahedra are vital importance by employing device-fabricating engineering. The aim of this work is to obtain a stable CsPbI3 polycrystalline thin film modulating the different parameters involved in the solution processing of the films, spanning from the employed solvent to the use of additives modifying the solution chemistry, to the use of alternative Pb sources DMAPbI3. The presented strategies allow to investigate the effect on the nucleation process and how the existence of solute–solvent crystalline intermediate phases have an impact on chemical reaction kinetics.

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