Examinando Artículos (Instituto de Ciencia de Materiales de Sevilla (ICMS) – CIC Cartuja) por Agencia financiadora "Engineering Physical Sciences Research Council (EPSCR) U. K."
(Nature Research, 2024-10-30) Frohna, Kyle; Chosy, Cullen; Al-Ashouri, Amral; Scheler, Florian; Chiang, Yu-Hsien; Dubajic, Milos; Anaya Martín, Miguel; Stranks, Samuel D.; Universidad de Sevilla. Departamento de Física de la Materia Condensada; European Union (UE). H2020; Engineering Physical Sciences Research Council (EPSCR) U. K.
Microscopy provides a proxy for assessing the operation of perovskite
solar cells, yet most works in the literature have focused on bare perovskite
thin flms, missing charge transport and recombination losses present in
full devices. Here we demonstrate a multimodal operando microscopy
toolkit to measure and spatially correlate nanoscale charge transport
losses, recombination losses and chemical composition. By applying this
toolkit to the same scan areas of state-of-the-art, alloyed perovskite cells
before and after extended operation, we show that devices with the highest
macroscopic performance have the lowest initial performance spatial
heterogeneity—a crucial link that is missed in conventional microscopy.
We show that engineering stable interfaces is critical to achieving robust
devices. Once the interfaces are stabilized, we show that compositional
engineering to homogenize charge extraction and to minimize variations
in local power conversion efciency is critical to improve performance and
stability. We fnd that in our device space, perovskites can tolerate spatial
disorder in chemistry, but not charge extraction.
