Electrode Bifacial Perovskite Solar Cells

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Electrode Bifacial Perovskite Solar Cells ( electrode-bifacial-perovskite-solar-cells )

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nanomaterials Article Light-Trapping Electrode for the Efficiency Enhancement of Bifacial Perovskite Solar Cells Anna A. Obraztsova 1,*,† Matthias Auf der Maur 3 , Daniele Barettin 2,*,† , Aleksandra D. Furasova 1 , Pavel M. Voroshilov 1 , , Andrea Orsini 2 and Sergey V. Makarov 1,4,5 1 2 3 4 5 * Correspondence: anna.obraztsova@metalab.ifmo.ru (A.A.O.); daniele.barettin@unicusano.it (D.B.); Tel.: +7-(981)859-27-15 (A.A.O.) † These authors contributed equally to this work. Abstract: Antireflection and light-trapping coatings are important parts of photovoltaic architectures, which enable the reduction of parasitic optical losses, and therefore increase the power conversion efficiency (PCE). Here, we propose a novel approach to enhance the efficiency of perovskite solar cells using a light-trapping electrode (LTE) with non-reciprocal optical transmission, consisting of a perforated metal film covered with a densely packed array of nanospheres. Our LTE combines charge collection and light trapping, and it can replace classical transparent conducting oxides (TCOs) such as ITO or FTO, providing better optical transmission and conductivity. One of the most promising applications of our original LTE is the optimization of efficient bifacial perovskite solar cells. We demonstrate that with our LTE, the short-circuit current density and fill factor are improved for both front and back illumination of the solar cells. Thus, we observe an 11% improvement in the light absorption for the monofacial PSCs, and a 15% for the bifacial PSCs. The best theoretical results of efficiency for our PSCs are 27.9% (monofacial) and 33.4% (bifacial). Our study opens new prospects for the further efficiency enhancement for perovskite solar cells. Keywords: light trapping; perovskite solar cells; transparent conducting electrode; dielectric nanospheres 1. Introduction Organic–inorganic lead halide perovskite solar cells (PSCs) are considered an up- and-coming substitute for well-known silicon solar cells. Perovskite materials possess excellent optical and electrical characteristics, such as a high light-absorption coefficient, long carrier lifetime, low exciton-binding energy and ambipolar transmission. Due to these vast advantages in the present photovoltaic (PV) industry, the use of PSCs for solar cells attracts tremendous research interest. The simplest PSC structure receives light on a single side (monofacial), and it is generally provided via a front electrode based on transparent conducting oxides, such as FTO and ITO of an electron transport layer, a photoactive layer (perovskite), a hole transport layer, and non-transmitting metallic contact. Such solar cells exhibit energy conversion efficiency (PCE) up to 25.7% [1,2]. There are many strategies and special designs aiming to improve the PCE of a PSC. First of all is the realization of PSC structures with transparent electrodes at both sides, collecting light on both the device surfaces (bifacial). The bottom transparent conductive contact allows the reflected radiation to be harvested, i.e., albedo, thereby increasing the photon flux used to generate energy. A 10% efficiency improvement School of Physics and Engineering, ITMO University, St. Petersburg 197101, Russia Department of Electronic Engineering, Università Niccoló Cusano, 00133 Rome, Italy Department of Electronic Engineering, University of Rome ‘Tor Vergata’, Via del Politecnico 1, 00133 Rome, Italy Harbin Engineering University, Harbin 150001, China Qingdao Innovation and Development Center of Harbin Engineering University, Qingdao 266000, China Citation: Obraztsova, A.A.; Barettin, D.; Furasova, A.D.; Voroshilov, P.M.; Auf der Maur, M.; Orsini, A.; Makarov, S.V. Light-Trapping Electrode for the Efficiency Enhancement of Bifacial Perovskite Solar Cells. Nanomaterials 2022, 12, 3210. https://doi.org/10.3390/ nano12183210 Academic Editor: Fabrizio Pirri Received: 4 August 2022 Accepted: 8 September 2022 Published: 15 September 2022 Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affil- iations. Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). Nanomaterials 2022, 12, 3210. https://doi.org/10.3390/nano12183210 https://www.mdpi.com/journal/nanomaterials

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