Controlled Growth of the Inorganic Backbone in Low-Dimensional Perovskites for Efficient, Stable, Semi-Transparent Wide Bandgap Perovskite Solar Cells

Abstract
Wide bandgap (WB) perovskites are of interest for envisioned applications in coloured and semi-transparent solar cells. For this, phase pure low dimensional perovskites (LDP) are of promise as they pair a tuneable wide bandgap with stability. However, so far, the power conversion efficiency (PCE) of LDP solar cells barely touched a few percentages, mainly due to inefficient charge transport being the inorganic layer spaced by organic sheets. To overcome such limit is essential to control the growth of the crystalline backbone, which is dictated by the alignment of the inorganic planes. Here, we demonstrate an effective strategy, based on the judicious choice of additives and controlled seed growth in the perovskite solution, to guide the crystallization of phase pure LDPs inorganic layers perpendicularly to the substrate. The vertically aligned LDP solar cells with only two inorganic layers held together (refereed to n = 2) and a bandgap of 2.0 eV, outperformed their non-oriented 2D counterpart, boosting the PCE to a record value of 9.4%. Furthermore, this sets a benchmark for the stability of WB PSCs, where 80% of the initial performance was retained after ~ 100 h illumination. To broaden the scope of our method, we fabricated semi-transparent LDP devices (transmittance > 30%) with a PCE of 6% paving the way for the development of tuneable smart solar devices.

Citation
Zanetta, A., Vishal, B., Faini, F., Pica, G., Marras, S., Yildirim, B., Babics, M., Ugur, E., Aydin, E., De Wolf, S., De Bastiani, M., & Grancini, G. (2023). Controlled Growth of the Inorganic Backbone in Low-Dimensional Perovskites for Efficient, Stable, Semi-Transparent Wide Bandgap Perovskite Solar Cells. https://doi.org/10.21203/rs.3.rs-2985134/v1

Acknowledgements
The authors acknowledge the “HY-NANO” project that received funding from the European Research Council (ERC) Starting Grant 2018 under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 802862, the Ministero dell’Università e della Ricerca (MUR) and the University of Pavia through the program “Dipartimenti di Eccellenza 2023-2027".

Publisher
Research Square Platform LLC

DOI
10.21203/rs.3.rs-2985134/v1

Additional Links
https://www.researchsquare.com/article/rs-2985134/v1

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