Effect of annealing on exciton diffusion in a high performance small molecule organic photovoltaic material
MetadataShow full item record
Singlet exciton diffusion was studied in the efficient organic photovoltaic electron donor material DTS(FBTTh2)2. Three complementary time-resolved fluorescence measurements were performed: quenching in planar heterojunctions with an electron acceptor; exciton-exciton annihilation; and fluorescence depolarization. The average exciton diffusivity increases upon annealing from 1.6 × 10-3 cm2 s-1 to 3.6 × 10-3 cm2 s-1, resulting in an enhancement of the mean two–dimensional exciton diffusion length (LD=√4Dτ) from 15 nm to 27 nm. About 30% of the excitons get trapped very quickly in as-cast films. The high exciton diffusion coefficient of the material leads to it being able to harvest excitons efficiently from large donor domains in bulk heterojunctions.
Long , Y , Hedley , G J , Ruseckas , A , Chowdhury , M , Roland , T J , Serrano , L , Cooke , G & Samuel , I D W 2017 , ' Effect of annealing on exciton diffusion in a high performance small molecule organic photovoltaic material ' , ACS Applied Materials & Interfaces , vol. 9 , no. 17 , pp. 14945-14952 . https://doi.org/10.1021/acsami.6b16487
ACS Applied Materials & Interfaces
© 2017 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.