Imaging Ultrafast Charge Transfer at Low-Dimensional Lead Halide Perovskite Heterostructures
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 (C6H5CH2CH2NH3)2(CH3NH3)n-1PbnI3n+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.
Authors
- Federico Visentin (ORCID: https://orcid.org/0000-0002-2210-210X)
- Lucía Olano‐Vegas (ORCID: https://orcid.org/0000-0002-4710-2069)
- Beatriz Martín‐García (ORCID: https://orcid.org/0000-0001-7065-856X)
- Franco V. A. Camargo (ORCID: https://orcid.org/0000-0001-8312-7899)
- Giulia Grancini (ORCID: https://orcid.org/0000-0001-8704-4222)
- Giulio Cerullo (ORCID: https://orcid.org/0000-0002-9534-2702)
- Fabiola Faini (ORCID: https://orcid.org/0000-0002-5653-6256)
- Luis E. Hueso (ORCID: https://orcid.org/0000-0002-7918-8047)
- Martin Hörmann
- Yaiza Asensio (ORCID: https://orcid.org/0000-0001-5434-638X)
Institutions
- Ikerbasque (ES)
- University of Pavia (IT)
- CIC nanoGUNE (ES)
- Istituto di Fotonica e Nanotecnologie (IT)
- National Interuniversity Consortium of Materials Science and Technology (IT)
- Politecnico di Milano (IT)
Publication Details
- Journal
- ACS Energy Letters
- Published
- 2024-12-13
- DOI
- https://doi.org/10.1021/acsenergylett.4c02786
- Citations
- 8
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.67
Funders
- Ministerio de Ciencia, Innovación y Universidades
- Ministero della transizione ecologica
- European Commission
- Ikerbasque, Basque Foundation for Science
- Università degli Studi di Pavia
- Regione Lombardia
- Ministero dell'Università e della Ricerca
- Horizon 2020 Framework Programme
- European Research Council
- European Regional Development Fund
- Agencia Estatal de Investigación
- European Social Fund
- H2020 Marie Skłodowska-Curie Actions