Synthesis of stable Hole Transporting Materials for Inverted Perovskite Solar Cells

Valentina Maruzzo^a^,^b, Antoine Bousquet^a, Fabio Matteocci^d, Elisa Nonni^d, Matteo Bonomo^b, Pierluigi Quagliotto^b, Claudia Barolo^b^,^c, Aldo Di Carlo^d, Nadia Barbero^b^,^c, Christine Lartigau-Dagron^a

^aIPREM, Université de Pau et des Pays de l’Adour, Pau, Avenue de l'Université BP 576, France.

^bDipartimento di Chimica, INSTM Reference Centre, Università degli Studi di Torino, Torino, Via Pietro Giuria 7, Italy.

^cInstitute of Science, Technology and Sustainability for the Development of Ceramic Materials (ISSMC-CNR), Faenza.

^dDipartimento di Ingegneria Elettronica, Università degli Studi di Roma-Tor Vergata, Roma, Via Cracovia 50, Italy.

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Spring 2024 Conference (MATSUS24)

#PeroFF - Perovskite: from fundamentals to device fabrication

Barcelona, Spain, 2024 March 4th - 8th

Organizers: Lioz Etgar, Wang Feng and Michael Saliba

Oral, Valentina Maruzzo, presentation 261
DOI: https://doi.org/10.29363/nanoge.matsus.2024.261
Publication date: 18th December 2023

Perovskite Solar Cells (PSCs) have reached impressive performances above 25% in just few years of research.[1] However, there are several factors leading to the limited long-term stability of the PSCs [2], which is still hampering their industrialization. Among them, the highly hygroscopic doping agents, frequently used to increase the conductivity of the hole transporting layer (HTL), accelerate the Perovskite degradation. Hence, the hole transporting materials (HTMs) are now being developed to get high efficiency in the absence or low concentration of these dopants. [3]

In this context, starting from the low-cost phenothiazine and carbazole scaffolds, which are characterized by easily tuneable energetic levels, we synthesised small molecules and polymers through a Suzuki coupling, eventually employing microwaves to promote the reaction yield and selectivity. In the meanwhile, greener synthetic routes have been studied. Once characterized, the materials were implemented in inverted PSCs, which are normally cheaper and more stable than the direct devices. [4] Their performances were studied: the most promising results were obtained with the small molecule A (figure 1), which was able to reach up to 10.96% of Power Conversion Efficiency (PCE) in the optimized conditions (vs 13.07% with the PTAA reference), attesting a high charge extraction. The applied thermal treatments allowed to increase the stability of the devices during the time.

References:

[1] Basumatary, P.; Agarwal, P., A short review on progress in perovskite solar cells. Materials Research Bulletin 2022, 149, 111700.

[2] Boyd CC, Cheacharoen R, Leijtens T, McGehee MD. Understanding Degradation Mechanisms and Improving Stability of Perovskite Photovoltaics. Chem Rev. 2019,119, 3418-3451.

[3] Yan, P.; Yang, D.; Wang, H.; Yang, S.; Ge, Z., Recent advances in dopant-free organic hole-transporting materials for efficient, stable and low-cost perovskite solar cells. Energy & Environmental Science 2022, 15, 3630-3669.

[4] Yang, J.; Luo, X.; Zhou, Y.; Li, Y.; Qiu, Q.; Xie, T., Recent Advances in Inverted Perovskite Solar Cells: Designing and Fabrication. Int J Mol Sci 2022, 23, 11792-11831.

Acknowledgements:

The present research has been founded by UNITA alliance, Université Franco Italienne, Project CH4.0 under the MUR program "Dipartimenti di Eccellenza 2023-2027" (CUP: D13C22003520001) and by the University of Torino – Grant for Internationalization.

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