Direct Evidence of the Presence of Hybrid Charge Transfer State in a Perovskite Nanocrystal‐Polythiophene Blend Solid State Film
Abstract In this paper, the photophysical properties of a hybrid material, composed of a conjugated polymer and perovskite nanocrystals, are investigated by ultrafast spectroscopy and morphological characterization. The relaxation dynamics of a drop‐casted film from the semiconducting polythiophene (P3HT) and a green‐emitting CsPbBr 3 (zwitterionic sulfobetaine ‐capped) perovskite nanocrystals (NCs) solution is studied. The transient spectroscopy presents a very long photobleaching signal peaked at 516 nm not present in the single components of the blend. The scanning electron and confocal fluorescence microscopy images show that the P3HT and the CsPbBr 3 NCs are finely mixed in the film. The presence of a very efficient hole transfer from the nanocrystal to the polymeric chain that induces the formation of a long ‐lived charge‐transfer state as shown in the pump‐probe measurements is proposed. The theoretical model reveals the important role of the zwitterionic sulfobetaine capper in this process. The perovskite strongly adsorbs the surfactant, while the polythiophene chain is not directly bound to the perovskite. Instead, it interacts with the surfactant itself, contributing to the electronic properties of the overall system.
Authors
- Arianna Cretı̀ (ORCID: https://orcid.org/0000-0003-0389-660X)
- Michele Guizzardi (ORCID: https://orcid.org/0000-0001-5377-5748)
- Stefania Milanese (ORCID: https://orcid.org/0000-0003-2100-5970)
- Asma A. Alothman
- Mariacecilia Pasini (ORCID: https://orcid.org/0000-0002-7811-6367)
- M. Anni (ORCID: https://orcid.org/0000-0002-1651-0166)
- Maria Luisa De Giorgi (ORCID: https://orcid.org/0000-0002-3774-6477)
- Tersilla Virgili (ORCID: https://orcid.org/0000-0002-8075-0498)
- Edoardo Mosconi (ORCID: https://orcid.org/0000-0001-5075-6664)
- Maryna I. Bodnarchuk (ORCID: https://orcid.org/0000-0001-6597-3266)
- Luca Gregori (ORCID: https://orcid.org/0000-0002-0023-8313)
- M. Lomascolo (ORCID: https://orcid.org/0000-0002-2851-8552)
Institutions
- University of Salento (IT)
- University of Perugia (IT)
- King Saud University (SA)
- ETH Zurich (CH)
- Istituto di Fotonica e Nanotecnologie (IT)
- Istituto di Chimica Biomolecolare (IT)
- Institute for Microelectronics and Microsystems (IT)
- Istituto di Scienze e Tecnologie Chimiche "Giulio Natta" (IT)
- Swiss Federal Laboratories for Materials Science and Technology (CH)
- Politecnico di Milano (IT)
Publication Details
- Journal
- Advanced Materials Interfaces
- Published
- 2025-02-27
- DOI
- https://doi.org/10.1002/admi.202401004
- Citations
- 1
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.73
Funders
- European Commission
- King Saud University
- China University of Petroleum, Beijing
- HORIZON EUROPE Framework Programme