Perovskite Thin Film Formation from Solution: Inside the Crystallization Process mediated by a Biopolymer

Antonella Giuri^a^,^b, Nicholas Rolston^c, Silvia Colella^d, Carola Esposito Corcione^b, Aurora Rizzo^a

^aCNR NANOTEC – Institute of Nanotechnology, c/o Campus Ecotekne, University of Salento, Via Monteroni, Lecce, 73100 Italy

^bUniversità del Salento, Lecce, Via per Monteroni, Lecce, Italy

^cSchool of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, AZ, USA

^dCNR NANOTEC - Università di Bari, Via Edoardo Orabona, 4, Bari, Italy

NIPHO
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO23)

Pavia, Italy, 2023 May 15th - 16th

Organizers: Giulia Grancini and Silvia Colella

Oral, Antonella Giuri, presentation 012
DOI: https://doi.org/10.29363/nanoge.nipho.2023.012
Publication date: 3rd April 2023

The fascinating optoelectronic properties of Hybrid Halide Perovskites have renewed the interest in the development of innovative photovoltaic devices alternative to Silicon-based technology. Reaching a straightforward solution-processability of perovskite films, combined with high reproducibility and stability to temperature, illumination and ambient (oxygen, moisture) over operational time via low-cost and large area fabrication technology, represents a highly desirable prospect to foster hybrid perovskite device uptake in a competitive high-tech market. A good control of the crystallization process, during the deposition, is mandatory to obtain high performing perovskite film [1]. Nowadays, the use of a non-solvent, as dripping in the last stage of spin-coating or by immersing the film into a bath after a coating deposition, is the most common method to obtain a high quality perovskite film, although strongly limits the up-scaling.

The main purpose of this work is the engineering of perovskite film formation with the aim to develop a general method for controlling the crystallization process to solve two of the major issues of hybrid halide perovskite materials: processability and stability.

The developed strategy foresees the use of biopolymer as template to assist the perovskite crystallization in a single coating step deposition, without the use of any additional dripping solvents. The interest in the exploration of biomaterials as additive as well as the choice of the less toxic solvents for the precursors solution represent a first fundamental step towards environmental friendly process. Among the biopolymers, polysaccharides were used as rheological modifier to tune the viscosity of perovskite precursor solutions developing stable inks suitable for more scalable printing technology. Moreover, the non-covalent interactions between adjacent chains confers superior flexibility moisture/thermodynamic stability to the perovskite final films, enabling the nanocomposite material to accommodate a strain, whilst maintaining transport properties suitable for devices, thus very attractive for flexible device application [2-5].

This work provides for a more in-depth study of the kinetic of crystallization process of the perovskite assisted by the biopolymer, with a glance at the deposition technique used, towards the fabrication of strong and stable high performing device.

References:

[1] Rizzo, Aurora, Andrea Listorti, and Silvia Colella. "Chemical insights into perovskite ink stability." Chem 8.1 (2022): 31-45.

[2] Giuri, Antonella, et al. "Polymeric rheology modifier allows single-step coating of perovskite ink for highly efficient and stable solar cells." Nano Energy 54 (2018): 400-408.

[3] Giuri, Antonella, et al. "Implication of polymeric template agent on the formation process of hybrid halide perovskite films." Nanotechnology 32.26 (2021): 265707.

[4] Giuri, Antonella, et al. "Robust, High-Performing Maize–Perovskite-Based Solar Cells with Improved Stability." ACS Applied Energy Materials 4.10 (2021): 11194-11203.

[5] Bisconti, Francesco, et al. "One-step polymer assisted roll-to-roll gravure-printed perovskite solar cells without using anti-solvent bathing." Cell Reports Physical Science 2.11 (2021): 100639.

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