| Full text | |
| Author(s): |
Garcia-Basabe, Yunier
[1]
;
Steinberg, David
[2]
;
Daminelli, Lara M.
[1]
;
Mendoza, Cesar D.
[3]
;
de Souza, E. A. Thoroh
[2]
;
Vicentin, Flavio C.
[4]
;
G. Larrude, Dunieskys
[2]
Total Authors: 7
|
| Affiliation: | [1] Univ Fed Integracao Latinoamer, UNILA, BR-85867970 Foz Do Iguacu - Brazil
[2] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, BR-01302907 Sao Paulo - Brazil
[3] Pontificia Univ Catolica Rio de Janeiro, Dept Fis, BR-22451900 Rio De Janeiro - Brazil
[4] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Physical Chemistry Chemical Physics; v. 23, n. 31 JUL 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
Organic/inorganic van der Waals heterojunctions formed by a combination of 2D materials with semiconductor polymer films enable the fabrication of new device architectures that are interesting for electronic and optoelectronic applications. Here, we investigated the charge-transfer dynamics at the interface between 2D layered franckeite (Fr) and two thiophene-based conjugated polymers (PFO-DBT and P3HT) from the resonantly core-excited electron. The unoccupied electronic states of PFO-DBT/Fr and P3HT/Fr heterojunctions were studied using near-edge X-ray absorption fine structure (NEXAFS) and resonant Auger (RAS) synchrotron-based spectroscopies. We found evidence of ultrafast (subfemtosecond charge-transfer times) interfacial electron delocalization pathways from specific electronic states. For the interface between the PFO-DBT polymer and exfoliated franckeite, the most efficient interfacial electron delocalization pathways were found through pi{*}(S-N) and pi{*}(S-C) electronic states corresponding to the benzothiadiazole and thiophene units. On the other hand, for the P3HT polymer, we found that electrons excited to pi-pi{*} and S1s-pi{*}(C-C) electronic states of the P3HT polymer are the most affected by the presence of exfoliated franckeite and consequently are the main interfacial electron-transfer pathways in this heterojunction. Our results have important implications in understanding how ultrafast electron delocalization is taking place in organic/inorganic van der Waals heterojunctions, which is relevant information in designing new devices involving these systems. (AU) | |
| FAPESP's process: | 18/08988-9 - Towards high speed optical devices by exploiting the unique properties of 2D materials |
| Grantee: | Hugo Luis Fragnito |
| Support Opportunities: | Regular Research Grants |