Imaging Ultrafast Charge Transfer at Low-Dimensional Lead Halide Perovskite Heterostructures
Source abstract
Abstract
Addressing interface physics and related photoinduced dynamics is crucial to understand charge carrier paths and losses and ultimately design efficient optoelectronic devices. However, such dynamics are often masked when bulky systems are investigated. In this work, we combine photoluminescence with ultrafast transient absorption microscopy to map charge transfer processes in few-layers-thick heterostructures made of low-dimensional (C 6 H 5 CH 2 CH 2 NH 3 ) 2 (CH 3 NH 3 ) n-1 Pb n I 3n+1 perovskite flakes of different dimensionalities ( n = 3) and ( n = 1). We observe that the hole transfer process from the ( n = 3) to the ( n = 1) phase happens after exciton diffusion on a time scale of tens of picoseconds, whereas electron transfer is hindered by the high exciton binding energy and low diffusion coefficient within the ( n = 1) phase. This study sets the stage for a deeper understanding needed for the smart development of new heterostructure combinations with different dimensionalities and band alignments.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Perovskite Materials and Applications · Organic and Molecular Conductors Research · Random lasers and scattering media
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry and INSTM, University of Pavia, Via T. Taramelli 14, 27100 Pavia, Italy
CIC nanoGUNE BRTA, Tolosa Hiribidea, 76, Donostia-San Sebastián 20018, Spain
Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy
IKERBASQUE-Basque Foundation for Science, Bilbao, 48009, Spain
Istituto di Fotonica e Nanotecnologie-CNR, Piazza L. da Vinci 32, 20133 Milano, Italy
Funding
Regione Lombardia · Agencia Estatal de Investigación · European Regional Development Fund · European Research Council · Università degli Studi di Pavia · Ministerio de Ciencia, Innovación y Universidades · Ministero della transizione ecologica · European Commission · Ikerbasque, Basque Foundation for Science · H2020 Marie Sklodowska-Curie Actions · Ministero dell'Università e della Ricerca · Horizon 2020 Framework Programme · European Social Fund Plus
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