Transient Spectroscopy of Frenkel and Charge Transfer Excitons in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">α</mi></math></span>-Sexithienyl Films

G. Lanzani; S. V. Frolov; P. A. Lane; Z. V. Vardeny; M. Nisoli; S. De Silvestri

doi:10.1103/PhysRevLett.79.3066

Transient Spectroscopy of Frenkel and Charge Transfer Excitons in $α$ -Sexithienyl Films

G. Lanzani, S. V. Frolov, P. A. Lane, Z. V. Vardeny, M. Nisoli, and S. De Silvestri

Phys. Rev. Lett. 79, 3066 – Published 20 October 1997

Abstract

Photoexcitations dynamics are investigated in α-sexithienyl nanocrystalline films using transient photomodulation in a spectral range from 0.4 to 2.5 eV and time domain from 200 fs to 50 ms. We identify intrachain and interchain excitations. The former are even parity excitons with ultrafast dynamics, whereas the latter are long-lived charge transfer excitons generated within 300 fs, which separate into uncorrelated polaron pairs in the submicrosecond time domain.

Received 23 December 1996

DOI:https://doi.org/10.1103/PhysRevLett.79.3066

Authors & Affiliations

G. Lanzani

Istituto di Matematica e Fisica, Università di Sassari, Sassari 07100 Italy and Istituto Nazionale per la Fisica della Materia, Unità di Milano, Milano 20133 Italy

S. V. Frolov, P. A. Lane, and Z. V. Vardeny