Work

Probing Femtosecond Charge Transfer Dynamics in P3HT–WS2 Nanocomposites via Resonant Core Hole Clock Spectroscopy

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide We investigate the ultrafast charge transfer (CT) dynamics in a nanocomposite of poly(3-hexylthiophene-2,5-diyl) (P3HT) and tungsten disulfide (WS 2 ) using the core-hole clock (CHC) spectroscopy method, complemented by atomic force microscopy (AFM), near-edge X-ray absorption fine structure (NEXAFS), and X-ray photoelectron spectroscopy (XPS). AFM and NEXAFS reveal that the incorporation of WS 2 modifies the nanoscale morphology and reduces the molecular ordering of P3HT, while XPS evidence the formation of a donor–acceptor interface. CHC analysis demonstrates orbital-specific enhancement of interfacial CT: the transfer time decreases from 8.1 ± 0.5 fs in pure P3HT polymer film to 4.8 ± 0.5 fs in the nanocomposite for π* orbitals and from 2.7 ± 0.5 fs to 1.4 ± 0.5 fs for σ* orbitals. The dependence of τ CT on excitation energy indicates a tunneling-mediated mechanism with enhanced electronic delocalization across the interface. These findings provide direct insight into how WS 2 incorporation promotes CT at the molecular level, highlighting P3HT–WS 2 nanocomposites as promising candidates for ultrafast optoelectronic applications.

Source: ACS Omega

DOI: 10.1021/acsomega.5c06764

Authors: Yunier Garcia-Basabe, Matheus Suenson Cardoso, Jorge Arce-Molina, Dunieskys G. Larrude

Institutions: Universidade Federal da Integração Latino-Americana, Universidade Presbiteriana Mackenzie

Language: English

Topic: Organic Electronics and Photovoltaics

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,935

Funders: Universidade Federal da Integração Latino-Americana, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Conselho Nacional de Desenvolvimento Científico e Tecnológico