Hot excitons increase the donor/acceptor charge transfer yield

• Verfasst von: Schulze, Michael [VerfasserIn]
• Verfasst von: Hänsel, Marc [VerfasserIn]
• Verfasst von: Tegeder, Petra [VerfasserIn]
• Titel: Hot excitons increase the donor/acceptor charge transfer yield
• Verf.angabe: Michael Schulze, Marc Hänsel, Petra Tegeder
• E-Jahr: 2014
• Jahr: 26 November 2014
• Umfang: 8 S.
• Fussnoten: Gesehen am 06.11.2020
• Titel Quelle: Enthalten in: The journal of physical chemistry <Washington, DC> / C
• Ort Quelle: Washington, DC : Soc., 2007
• Jahr Quelle: 2014
• Band/Heft Quelle: 118(2014), 49, Seite 28527-28534
• ISSN Quelle: 1932-7455
• DOI: doi:10.1021/jp510701w
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1738032167

Abstract

Understanding the photoinduced ultrafast charge transfer (CT) dynamics across the donor/acceptor interface is a prerequisite for optimizing the performance of organic photovoltaic devices. Time-resolved second harmonic generation, an interface-sensitive probe with femtosecond temporal resolution, is applied to investigate the well-defined single heterojunction C60/P3HT. The de-excitation of hot singlet excitons in the conduction bands of the polymer into localized excitonic states is observed. In the presence of the electron acceptor, the ultrafast population of a CT state is identified as the dominating relaxation channel. Interestingly, the charge transfer yield correlates with the excitation wavelength and rises with increasing excess energy.