Two Step Glancing Angle Deposition of Supported Vertically Aligned Organometallic Halide Perovskite Nanostructures
Javier Castillo-Seoane a, Lidia Contreras-Bernal a, Jose Manuel Obrero-Pérez a, Xabier García-Casas a, Francisco J Aparicio b, M Carmen López-Santos b, T Cristina Rojas a, Juan A Anta c, Ana Borrás a, Ángel Barranco a, Juan Ramón Sánchez-Valencia a
a Institute of Materials Science of Seville, (Spanish National Research Council (CSIC) – Univ. Seville), Seville, Spain
b Departament of Applied Physics I, Escuela Politécnica Superior, University of Seville, Seville, Spain
c Department of Physical, Chemical and Natural Systems, (Univ. Pablo de Olavide), Sevilla, Spain
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Javier Castillo-Seoane, presentation 065
Publication date: 20th April 2022

The control over light polarization remains an unsolved challenge in optoelectronic technologies such as displays or photographic cameras. In these applications, the main drawback is the significant optical losses produced by polarizers used to generate polarized light. In such a context, organometal halide perovskites (OMHP) can play a decisive role given their tuneable optical properties such as bandgap and photoluminescence, and excellent light emission with a low non-radiative recombination rate. Their outstanding electrical properties have elevated hybrid perovskites as the material of choice in photovoltaics and optoelectronics. The nanostructured form of OMHP such as nanowires and nanorods, have recently arisen as key players in the control of light polarization.

In this work, [Castillo-Seoane, J., et al. Advanced Materials, 2022] we propose the application of an evolved version of the vacuum technique Glancing Angle Deposition (GLAD) as an advanced alternative to the synthesis of anisotropic supported OMHP nanostructures. Our approach is a two-step fabrication procedure consisting of the room temperature deposition of PbI2 at glancing angles, followed by deposition of CH3NH3I at normal incidence (0º). As a result, highly anisotropic perovskite nanostructures resembling “nanowalls” have been fabricated. Such alignment degree endows the samples with anisotropic optical properties such as UV-Visible absorption and photoluminescence. Moreover, their implementation in n-i-p solar cells can be used to develop self-powered polarization-sensitive photodetectors along the visible range. Therefore, the application of Glancing Angle Deposition provides highly anisotropic, microstructure and thickness controlled OMHP, with potential for large area fabrication. This technique is fully compatible with microelectronic and optoelectronic processing methods including CMOS and roll-to-roll technologies, opening the path towards the development of tuneable anisotropic optoelectronic devices based on OMHP.

We thank the projects PID2019-110430GB-C21, PID2019-110430GB-C22 and PID2019-109603RA-I00 funded by MCIN/AEI/ 10.13039/501100011033 and by “ERDF (FEDER) A way of making Europe”, by the “European Union”. We also thank the Consejería de Economía, Conocimiento, Empresas y Universidad de la Junta de Andalucía (PAIDI-2020 through projects US-1263142, US-1381045, US-1381057, AT17-6079, P18-RT-3480), and the EU through cohesion fund and FEDER 2014–2020 programs for financial support. CLS and JS-V thank the University of Seville through the VI PPIT-US. JS-V and Lidia Contreras acknowledge the Ramon y Cajal and Juan de la Cierva programs, respectively, funded by MCIN/AEI/ 10.13039/501100011033. FJA also thanks to the EMERGIA Junta de Andalucía program. The projects leading to this article have received funding from the EU H2020 program under the grant agreements 851929 (ERC Starting Grant 3DScavengers). JAA thanks MCIN/AEI/ 10.13039/501100011033 for SCALEUP project PCI2019-111839-2.

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