cicCartuja Centro de Investigaciones Científicas de la cartuja

Artículo del mes 2017

Electron injection and scaffold effects in perovskite solar cells

ICMS

Miguel Anaya, Wei Zhang, Bruno Clasen Hames, Yuelong Li, Francisco Fabregat-Santiago, Mauricio E. Calvo, Henry J. Snaith, Hernán Míguez and Iván Mora- Seró Journal of Materials Chemistry C 2017, Vol. 5, 634


In spite of the impressive efficiencies reported for perovskite solar cells (PSCs), key aspects of their working principles, such as electron injection at the contacts or the suitability of the utilization of a specific scaffold layer, are not yet fully understood. Increasingly complex scaffolds attained by the sequential deposition of TiO2 and SiO2 mesoporous layers onto transparent conducting substrates are used to perform a systematic characterization of both the injection process at the electron selective contact and the scaffold effect in PSCs. By forcing multiple electron injection processes at a controlled sequence of perovskite–TiO2 interfaces before extraction, interfacial injection effects are magnified and hence characterized in detail. An anomalous injection behavior is observed, the fingerprint of which is the presence of significant inductive loops in the impedance spectra with a magnitude that correlates with the number of interfaces in the scaffold. Analysis of the resistive and capacitive behavior of the impedance spectra indicates that the scaffolds could hinder ion migration, with positive consequences such as lowering the recombination rate and implications for the current–potential curve hysteresis. Our results suggest that an appropriate balance between these advantageous effects and the unavoidable charge transport resistive losses introduced by the scaffolds will help in the optimization of PSC performance.

 

Requisitos

  • Pertenecer a uno de los Institutos del cicCartuja
  • Ser menor de 31 años en el momento de presentar su solicitud
  • Ser el primer firmante del artículo
  • Haberse publicado en los últimos 6 meses
  • El trabajo debe haberse realizado, al menos en parte, en el cicCartuja

Los artículos seleccionados serán destacados como 'Artículos del mes' y participarán en el Premio de Investigación cicCartuja-Ebro Foods. Se concederá un Premio de 10.000 euros al ganador y dos Accésits de 5.000 euros cada uno al segundo y tercer clasificados.

 

Ver bases del Premio