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El grafeno es clave para la fabricación de nuevas células solares

El grafeno es clave para la fabricación de la nueva generación de células solares

El equipo de Yun Hang Hu, profesor de ciencia e ingeniería de los materiales en la Universidad Tecnológica de Michigan, ha descubierto que agregando grafeno al dióxido de titanio se aumenta su conductividad, produciendo un 52,4 por ciento más de corriente en el circuito, esta conductividad eléctrica de las hojas de grafeno les permite actuar como puentes acelerando la transferencia de los electrones desde el dióxido de titanio al fotoelectrodo, lo anterior podría hacer del grafeno un ingrediente decisivo en la próxima generación de células fotovoltaicas.

El equipo del profesor Yun también ha desarrollado un método práctico para la creación de láminas de dióxido de titanio con el grafeno incorporado, este nuevo enfoque es un modo barato y fácil de aumentar la eficiencia de las células solares, pero hay que usar la cantidad exacta de grafeno; si se usa demasiado absorbe la luz en la célula solar y reduce su eficiencia.

Las células solares del tipo DSSC (basadas en tintes) no dependen de materiales raros o caros, por lo que podrían resultar más rentables que las células solares basadas en el silicio y en las tecnologías de fabricación de películas delgadas, pero no son tan buenas para convertir la luz en electricidad.

En las células solares basadas en tintes los fotones impactan en los electrones del tinte y los hacen desplazarse hacia una capa delgada de dióxido de titanio que los conduce al ánodo.

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