Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 112, Issue 37, Pages 11601-11604Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp8042363
Keywords
-
Categories
Funding
- Dutch Polymer institute [518]
Ask authors/readers for more resources
The temperature dependence of the exciton dynamics in a conjugated polymer is studied using time-resolved spectroscopy. Photoluminescence decays were measured in heterostructured samples containing a sharp polymer-fullerene interface, which acts as an exciton quenching wall. Using a ID diffusion model, the exciton diffusion length and diffusion coefficient were extracted in the temperature range of 4-293 K. The exciton dynamics reveal two temperature regimes: in the range of 4-150 K, the exciton diffusion length (coefficient) of similar to 3 nm (similar to 1.5 x 10(-4) cm(2)/s) is nearly temperature independent. Increasing the temperature up to 293 K leads to a gradual growth up to 4.5 nm (similar to 3.2 x 10(-4) cm(2)/s). This demonstrates that exciton diffusion in conjugated polymers is governed by two processes: an initial downhill migration toward lower energy states in the inhomogenously broadened density of states, followed by temperature activated hopping. The latter process is switched off below 150 K.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available