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© 2025 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

The interfacial energy level alignment in the copper phthalocyanine/SiO2/p-Si(100) heterojunction has been studied in dark conditions and under illumination. The element-sensitivity of the time-resolved X-ray photoemission provides a real-time picture of the photoexcited carrier dynamics at the interface and within the film, enabling one to distinguish between substrate and molecular contributions. We observe a molecule-to-substrate charge transfer under photoexcitation, which is directly related to the transient modification of the band bending in the substrate due to the surface photovoltage effect. Our results show that charge generation in the heterojunction is driven by the molecular layer in contact with the substrate. The different molecular orientation at the interface creates a new channel for charge injection in the substrate under photoexcitation.

Details

Title
Interfacial Charge Transfer Enhances Transient Surface Photovoltage in Hybrid Heterojunctions
Author
Soncini, Cristian 1   VIAFID ORCID Logo  ; Costantini, Roberto 2   VIAFID ORCID Logo  ; Martina Dell’Angela 3   VIAFID ORCID Logo  ; Morgante, Alberto 2 ; Pedio, Maddalena 4   VIAFID ORCID Logo 

 CNR—Istituto Officina dei Materiali (IOM), S.S. 14 km 163.5, 34149 Trieste, Italy; [email protected] (R.C.); [email protected] (M.D.); [email protected] (A.M.); [email protected] (M.P.); Elettra Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5, 34149 Trieste, Italy 
 CNR—Istituto Officina dei Materiali (IOM), S.S. 14 km 163.5, 34149 Trieste, Italy; [email protected] (R.C.); [email protected] (M.D.); [email protected] (A.M.); [email protected] (M.P.); Dipartimento di Fisica, Università di Trieste, Via Valerio 2, 34127 Trieste, Italy 
 CNR—Istituto Officina dei Materiali (IOM), S.S. 14 km 163.5, 34149 Trieste, Italy; [email protected] (R.C.); [email protected] (M.D.); [email protected] (A.M.); [email protected] (M.P.) 
 CNR—Istituto Officina dei Materiali (IOM), S.S. 14 km 163.5, 34149 Trieste, Italy; [email protected] (R.C.); [email protected] (M.D.); [email protected] (A.M.); [email protected] (M.P.); CNR—Istituto Officina dei Materiali (IOM), Via Pascoli, 06123 Perugia, Italy 
First page
154
Publication year
2025
Publication date
2025
Publisher
MDPI AG
e-ISSN
20794991
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3165817025
Copyright
© 2025 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.