Rosinda Fuentes Pineda

Bio: Rosinda Fuentes Pineda is an academic researcher. The author has contributed to research in topics: Perovskite (structure) & Physics. The author has an hindex of 2, co-authored 6 publications receiving 45 citations.

Improved Stability of Inverted and Flexible Perovskite Solar Cells with Carbon Electrode

Abstract: We demonstrate highly efficient, stable, and flexible perovskite solar cells of large areas, utilizing a carbon back-contact electrode in a p–i–n cell configuration. We enabled good electronic cont...

Light-Stable Methylammonium-Free Inverted Flexible Perovskite Solar Modules on PET Exceeding 10.5% on a 15.7 cm 2 Active Area

Abstract: Perovskite solar modules (PSMs) have been attracting the photovoltaic market, owing to low manufacturing costs and process versatility. The employment of flexible substrates gives the chance to explore new applications and further increase the fabrication throughput. However, the present state-of-the-art of flexible perovskite solar modules (FPSMs) does not show any data on light-soaking stability, revealing that the scientific community is still far from the potential marketing of the product. During this work, we demonstrate, for the first time, an outstanding light stability of FPSMs over 1000 h considering the recovering time (T80 = 730 h), exhibiting a power conversion efficiency (PCE) of 10.51% over a 15.7 cm2 active area obtained with scalable processes by exploiting blade deposition of a transporting layer and a stable double-cation perovskite (cesium and formamidinium, CsFA) absorber.

Transparent conductive electrodes based on co-sputtered ultra-thin metal layers for semi-transparent perovskites solar cells

Abstract: Back contact transparent conductive electrodes are essential components of semi-transparent perovskite solar cells, which are especially beneficial for tandem photovoltaics. In this Letter, we present a way to realize ultrathin metal layers in ITO-metal-ITO (IMI) electrode stacks, which are characterized by the superior infrared transmittance and electrical conductivity. The metal layers are deposited by the co-sputtering technique, which enables the realization of smooth metallic films, as thin as 5 nm. We applied the IMI electrodes to flexible high bandgap perovskite solar cells and demonstrated that the IMI electrodes based on the co-sputtered metals are outperforming the standard ITO electrodes in terms of cell performance, while maintaining similar transmission values. Furthermore, we show that the IMI electrodes are significantly more flexible than the standard ITO and, thus, are more suitable for flexible optoelectronic devices. The co-sputtering technique is compatible with the industrial production process. Overall, the co-sputtered IMI stack presented in this work paves the way for the commercial utilization of semi-transparent (visible or near-infrared range) photovoltaic devices, including high-efficiency tandem applications and window-integrated photovoltaics.

Pushing commercialization of perovskite solar cells by improving their intrinsic stability

Abstract: Despite the rapid progress in the power conversion efficiency (PCE) from 3.8% to 25.5% with ten years of effort, the real outdoor applications of perovskite solar cells (PSCs) are still significantly limited by their poor device stability. The factors determining the stability of PSCs can be divided into extrinsic and intrinsic factors. Advanced encapsulation techniques can be applied to only exclude the effect from extrinsic environmental factors such as moisture and oxygen in ambient air. The intrinsic stability issues of PSCs are difficult to thoroughly resolve by device engineering, determining the short life span of devices. Therefore, in this review, we only focus on the intrinsic stability of PSCs, especially the stability related to the properties of the perovskite active materials. Several degradation mechanisms of perovskite materials resulting from (1) ion dissociation and migration, (2) metal–perovskite reactions, and (3) residual strain are thoroughly analyzed and the corresponding possible strategies to improve the device stability are summarized. Finally, the perspective of research directions in the perovskite photovoltaic field for future large-scale deployment has been discussed. This review will draw tremendous attention from worldwide researchers to the intrinsic stability study of perovskites and provide useful guidance to further improve the operational stability of PSCs.

Low-temperature carbon-based electrodes in perovskite solar cells

Abstract: Carbon-based electrodes have been widely applied in perovskite solar cells (PSCs) because of their chemical inertness and compatibility with up-scalable techniques, signifying their solid potential for mass-production. The material scarcity and complexity of metal ore extraction further highlights that conventionally used noble metal electrodes cannot represent a sustainable option for back-contact in PSCs, while cells with carbon-based electrodes represent an excellent solution to these problems. However, their power conversion efficiencies (PCEs) still lag behind the traditionally processed cells with metal electrodes, resulting in a considerable efficiency gap. To overcome this issue, we propose the use of low-temperature carbon-based (LTCB) electrodes, which offer several key advantages in comparison to mesoscopic high-temperature treated ones: (1) larger choice of selective layers, (2) applicability to all perovskite crystallization methods, (3) compatibility with flexible substrates and (4) faster deposition process. In this review, we analyze numerous techniques to formulate the LTCB-paste and ways to deposit it on the cell stack which have been developed in order to improve the interfacial contact and electrode conductivity. Besides describing the current state-of-the-art perovskite solar cells with LTCB-electrodes, the most promising strategies to enhance the PCE of such photovoltaic (PV) devices are discussed. Overall, we emphasize that PSCs with a LTCB-electrode combine high device stability, low manufacturing costs and low environmental impact, while having options for pushing the efficiency of carbon-based PSCs closer to the record-breaking cells, all of which are vital in order to fulfill the true potential of perovskite PV.

Roadmap on organic–inorganic hybrid perovskite semiconductors and devices

Abstract: Metal halide perovskites are the first solution processed semiconductors that can compete in their functionality with conventional semiconductors, such as silicon. Over the past several years, perovskite semiconductors have reported breakthroughs in various optoelectronic devices, such as solar cells, photodetectors, light emitting and memory devices, and so on. Until now, perovskite semiconductors face challenges regarding their stability, reproducibility, and toxicity. In this Roadmap, we combine the expertise of chemistry, physics, and device engineering from leading experts in the perovskite research community to focus on the fundamental material properties, the fabrication methods, characterization and photophysical properties, perovskite devices, and current challenges in this field. We develop a comprehensive overview of the current state-of-the-art and offer readers an informed perspective of where this field is heading and what challenges we have to overcome to get to successful commercialization.