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POLYMAT research unveils the exceptional performance and stability of cutting-edge solar cells

Posted on julio 11, 2023julio 8, 2023 by AINHOA LÓPEZ-ABADÍA URRESTI

Juan Luis Delgado, an Ikerbasque researcher at POLYMAT and UPV/EHU, contributes to an international collaborative project recently published in the renowned journal JACS.

Juan Luis Delgado, Ikerbasque researcher at POLYMAT and the University of the Basque Country (UPV/EHU) in collaboration with researchers from the University of Oxford (UK), has published an article in the prestigious journal JACS (Journal of the American Chemical Society) that explains the functioning of perovskite solar cells with top-level efficiency and improved stability.

Perovskite solar cells could be the alternative to those of crystalline silicon currently on the market as they have advantages over conventional silicon panels, such as higher efficiency (efficiencies above 25%) and lower cost. Perovskite cells are manufactured by «solution processing», which is cheaper and less polluting than silicon purification. Their main drawback when it comes to commercialisation is their stability, and it is in this area that scientific research, such as that which has been published in JACS, is currently focused.

A team of Oxford University researchers led by Henry Snaith (University of Oxford, UK) and Juan Luis Delgado (Ikerbasque, POLYMAT and UPV/EHU, Spain) have joined forces to provide insights into the use of state-of-the-art additives to obtain highly efficient and stable solar cells.  In 2019-2022 several research groups described the incorporation of a small amount of additive (methylenediammonium dichloride) to achieve the highest efficiency certified so far for perovskite solar cells (25.7% PCE). In this work, the role of the additive during perovskite crystal growth has been studied and it has been found that this additive decomposes over time to more stable chemical forms conferring improved perovskite stability (>1 year exposed to air).

These results are extremely important and will have direct implications for the future development of stable, high-efficiency perovskite photovoltaic devices.

Professor Delgado received his B.Sc. degree in Chemistry (2000) from the University of Castilla-la Mancha, and later received his doctorate in Chemistry (2004) from the same university. During 2004 and 2006, he worked at the CNRS (Strasbourg and Toulouse, France) as a postdoctoral researcher. From 2006 to 2008 he was a «Juan de la Cierva» researcher at the Complutense University of Madrid. From 2008 to 2013 he was a «Ramón y Cajal» researcher at Imdea Nanoscience, Madrid. Since 2015 he has been an Ikerbasque researcher and leads the Hybrid Materials for Energy group at POLYMAT and at the University of the Basque Country (UPV/EHU).

+ info: https://www.ehu.eus/en/web/campusa-magazine/-/polymat-research-juan-luis-delgado

Juan Luis Delgado | Photo: Ikerbasque

«Una investigación desentraña el funcionamiento de las células solares más eficientes y estables»

Juan Luis Delgado, investigador Ikerbasque en POLYMAT y en la UPV/EHU, participa en un trabajo de colaboración internacional publicado recientemente en la prestigiosa revista JACS.

Juan Luis Delgado, investigador Ikerbasque en POLYMAT y la Universidad del País Vasco UPV/EHU en colaboración con investigadores de la Universidad de Oxford (Reino Unido) han publicado un artículo en la prestigiosa revista JACS (Journal of the American Chemical Society) que explica el funcionamiento de las células solares de perovskita de más alta eficiencia y estabilidad mejorada.

Las células solares de perovskitas podrían ser la alternativa a las de silicio cristalino comercializadas actualmente, ya que presentan ventajas frente a los paneles convencionales de silicio, tales como una mayor eficiencia (eficiencias superiores al 25%) y un menor coste. Las células de perovskita se fabrican mediante “procesamiento en solución” que resulta económicamente más barato y menos contaminante que la purificación del silicio. Su principal inconveniente de cara a su comercialización es su estabilidad, y es en esta área donde actualmente se concentra la investigación científica, como la publicada en JACS.

Un equipo de investigadores de la Universidad de Oxford liderados por Henry Snaith (Universidad de Oxford, Reino Unido) y Juan Luis Delgado (Ikerbasque, POLYMAT y la Universidad del País Vasco, España) han unido fuerzas para proporcionar información sobre la utilización de aditivos de última generación para obtener células solares de alta eficiencia y estabilidad.  En los años (2019-2022), varios grupos de investigación han descrito células solares de perovskita altamente eficientes mediante la incorporación de una pequeña cantidad de aditivo (dicloruro de metilendiamonio) para lograr la mayor eficiencia certificada hasta ahora para células solares de perovskita (25,7% PCE). En este trabajo hemos estudiado el papel del aditivo durante el crecimiento de cristales de perovskita y se ha encontrado que este aditivo se descompone en el tiempo a formas química más estables que confiere una estabilidad mejorada a la perovskita (>1 año expuesta al aire).

Estos resultados son extremadamente importantes y tendrán consecuencias directas para el futuro desarrollo de dispositivos fotovoltaicos de perovskita estables y de alta eficiencia.

El Doctor Juan Luis Delgado obtuvo la licenciatura en Química (2000) en la Universidad de Castilla-la Mancha. Después, se doctoró en Química (2004) en la misma universidad. Durante 2004 y 2006, trabajó en el CNRS (Strasbourg y Toulouse, Francia) como investigador postdoctoral. De 2006 a 2008 fue investigador “Juan de la Cierva” en la Universidad Complutense de Madrid. De 2008 a 2013 fue investigador “Ramón y Cajal” en Imdea Nanociencia, Madrid. Desde el año 2015 es investigador Ikerbasque y lidera el grupo de Materiales Híbridos para Energía en POLYMAT y en la Universidad del País Vasco (UPV/EHU).

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