Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 26, Pages 7922-7928Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc00951e
Keywords
-
Funding
- European Research Council [321305]
- EPSRC [EP/L017008/1, EP/M508214/1]
- Australian Renewable Energy Agency within the Australian Centre for Advanced Photovoltaics (AUSIAPV/ACAP)
- EPSRC [EP/L017008/1] Funding Source: UKRI
- European Research Council (ERC) [321305] Funding Source: European Research Council (ERC)
Ask authors/readers for more resources
Exciton diffusion is an important part of light harvesting in organic photovoltaics (OPVs) because it enables excitons to reach the interface between donor and acceptor and contribute to the photocurrent. Here we used simple and cost-effective techniques of thermal annealing and solvent vapour annealing to increase the exciton diffusion coefficient and exciton diffusion length in two liquid crystalline electron donor materials BQR and BTR. We found that the three-dimensional exciton diffusion length increased to similar to 40 nm upon annealing in both materials. Grazing-incidence wide angle X-ray scattering (GIWAXS) measurements show an increase of crystallite size to similar to 37 nm in both materials after thermal annealing. We determined an average domain size of these materials in the blends with PC71BM using diffusion-limited fluorescence quenching and found that it increased to 31 nm in BTR PC71BM blends and to 60 nm in BQR PC71BM blends. Our results provide understanding of how annealing improves device efficiency.
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