Open AccessReal-Time Tracking of Singlet Exciton Diffusion in Organic Semiconductors
Author(s) -
Oleg V. Kozlov,
Foppe de Haan,
Ross A. Kerner,
Barry P. Rand,
David Cheyns,
Maxim S. Pshenichnikov
Publication year - 2016
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.116.057402
Subject(s) - organic semiconductor , exciton , materials science , optoelectronics , diffusion , femtosecond , organic solar cell , oled , semiconductor , diode , spectroscopy , singlet state , tracking (education) , monte carlo method , laser , optics , atomic physics , physics , nanotechnology , condensed matter physics , polymer , layer (electronics) , quantum mechanics , excited state , psychology , pedagogy , statistics , mathematics , composite material , thermodynamics
Exciton diffusion in organic materials provides the operational basis for functioning of such devices as organic solar cells and light-emitting diodes. Here we track the exciton diffusion process in organic semiconductors in real time with a novel technique based on femtosecond photoinduced absorption spectroscopy. Using vacuum-deposited C-70 layers as a model system, we demonstrate an extremely high diffusion coefficient of D approximate to 3.5 x 10(-3) cm(2)/s that originates from a surprisingly low energetic disorder o