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Andrea Cerdán Pasarán

Bio: Andrea Cerdán Pasarán is an academic researcher from Centro de Investigaciones en Optica. The author has contributed to research in topics: Perovskite (structure) & Electrode. The author has an hindex of 2, co-authored 2 publications receiving 74 citations.

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TL;DR: The Co-doped PSC exhibits excellent optoelectronic properties; the improvements by passivation of electronic trap or sub-band-gap states arising due to the oxygen vacancies in pristine TiO2, enabling faster electron transport and collection are explained.
Abstract: We for the first time report the incorporation of cobalt into a mesoporous TiO2 electrode for application in perovskite solar cells (PSCs). The Co-doped PSC exhibits excellent optoelectronic properties; we explain the improvements by passivation of electronic trap or sub-band-gap states arising due to the oxygen vacancies in pristine TiO2, enabling faster electron transport and collection. A simple postannealing treatment is used to prepare the cobalt-doped mesoporous electrode; UV-visible spectroscopy, X-ray photoemission spectroscopy, space charge-limited current, photoluminescence, and electrochemical impedance measurements confirm the incorporation of cobalt, enhanced conductivity, and the passivation effect induced in the TiO2. An optimized doping concentration of 0.3 mol % results in the maximum power conversion efficiency of 18.16%, 21.7% higher than that of a similar cell with an undoped TiO2 electrode. Also, the device shows negligible hysteresis and higher stability, retaining 80.54% of the initial efficiency after 200 h.

74 citations

Journal ArticleDOI
TL;DR: In this article, a small amount of cesium iodide was added to the precursor solution of CH3NH3PbI3-based perovskite films to improve the morphology, phase and optoelectronic properties.
Abstract: The formation of smooth, dense, and uniform perovskite layers on substrates is crucial for achieving high-performance perovskite devices. Here, we show that the introduction of a small concentration of cesium iodide to the precursor solution has a considerable effect on the morphology, phase and optoelectronic properties of CH3NH3PbI3-based perovskite films. An optimized concentration of 3% produces a high-quality perovskite film with a large grain size of ∼1.8 μm and a root mean square roughness of 5.917 nm. The improved morphology and high optoelectronic quality of the perovskite layer were verified by SEM, AFM, XRD, and UV-visible, photoluminescence and electrochemical impedance spectroscopy. The defect-free thin perovskite layer enables the fabrication of a mesoscopic CH3NH3PbI3-based perovskite device under ambient conditions, with a maximum power conversion efficiency of ∼19% with negligible hysteresis and high reproducibility. This method can be extended to other complexes of perovskite used in the present state-of-the-art perovskite solar cells.

20 citations


Cited by
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Journal ArticleDOI
TL;DR: Heterogeneous photocatalysis, an advanced oxidation process, has garnered extensive attention in the field of environmental remediation because it involves the direct utilization of solar energy for the removal of numerous pollutants as discussed by the authors .

250 citations

Journal ArticleDOI
TL;DR: In this article, a review of recent developments in SnO2 as the electron transporting layer (ETL) of perovskite solar cells (PSCs) is presented.

121 citations

Journal ArticleDOI
TL;DR: In this article, the authors exploit a vast number of defect engineering approaches aiming to increase the performance and the stability of perovskite solar cells, especially against humidity, continuous illumination, and heat.
Abstract: The surface, interfaces and grain boundaries of a halide perovskite film carry critical tasks in achieving as well as maintaining high solar cell performance due to the inherently defective nature across their regime. Passivating materials and felicitous process engineering approaches have significant ramifications in the resultant perovskite film, and the solar cell's overall macroscale properties as they dictate structural and optoelectronic properties. Herein, we exploit a vast number of defect engineering approaches aiming to increase the performance and the stability of perovskite solar cells, especially against humidity, continuous illumination, and heat. This review begins with the perovskite materials' fundamental structural properties followed by the advances made to induce higher stabilization in perovskite solar cells by fine-tuning materials chemistry design parameters. We continue by summarizing defect passivation strategies based on molecular entities' application, including suitable functional groups that enable sufficient surface, bulk and grain boundary passivation, morphology, and crystallinity control. We also present methods to control the density of defects through the variation of processing conditions, solvent annealing and solvent engineering approaches, gas-assisted deposition methods, and use of self-assembled monolayers, as well as colloidal engineering and coordination surface chemistry. Finally, we give our perspective on how a combined understanding of materials chemistry aspects and passivation mechanisms will further develop high-efficiency and stability perovskite solar cells.

115 citations

Journal ArticleDOI
17 Mar 2021-Joule
TL;DR: In this article, the electrical properties of mesoscopic perovskite solar cells were compared with Li-salts with different anions, and the authors found that the anions of the Li-salt dopants affect the electric properties of the electron transfer layers and the solar cell performance.

96 citations

Journal ArticleDOI
TL;DR: Antimony-doped tin oxide nanorod arrays are proposed as novel transparent conductive mesoporous layers in PSCs to resolve the common problem of uneven growth of perovskite on rough surface and provide a new avenue to further design high-efficiency PSC's from the aspect of carrier transport and recombination.
Abstract: Lead halide perovskite solar cells (PSCs) with the high power conversion efficiency (PCE) typically use mesoporous metal oxide nanoparticles as the scaffold and electron-transport layers. However, the traditional mesoporous layer suffers from low electron conductivity and severe carrier recombination. Here, antimony-doped tin oxide nanorod arrays are proposed as novel transparent conductive mesoporous layers in PSCs. Such a mesoporous layer improves the electron transport as well as light utilization. To resolve the common problem of uneven growth of perovskite on rough surface, the dynamic two-step spin coating strategy is proposed to prepare highly smooth, dense, and crystallized perovskite films with micrometer-scale grains, largely reducing the carrier recombination ratio. The conductive mesoporous layer and high-quality perovskite film eventually render the PSC with a remarkable PCE of 20.1% with excellent reproducibility. These findings provide a new avenue to further design high-efficiency PSCs from the aspect of carrier transport and recombination.

93 citations