Journal
ADVANCED ENERGY MATERIALS
Volume 4, Issue 18, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201400527
Keywords
-
Categories
Funding
- EMRP-REG project [JRP: IND07]
- EPSRC via SCALLOPS project [EP/J500021/1]
- EPSRC via SUPERGEN project [EP/G031088/1]
- EPSRC [EP/G060738/1]
- Center for Doctoral Training [EP/G037515/1]
- Engineering and Physical Sciences Research Council [EP/J500021/1, EP/J021199/1, EP/G031088/1, EP/G060738/1, 1030565] Funding Source: researchfish
- EPSRC [EP/G031088/1, EP/J500021/1, EP/J021199/1, EP/G060738/1] Funding Source: UKRI
Ask authors/readers for more resources
The effects of heteroatom substitution from a silicon atom to a germanium atom in donor-acceptor type low band gap copolymers, poly[(4,4'-bis(2-ethylhexyl) dithieno[3,2-b: 2', 3'-d]silole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7-diyl] (PSiBTBT) and poly[(4,4'-bis(2-ethylhexyl) dithieno[3,2-b: 2', 3'-d] germole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7-diyl] (PGeBTBT), are studied. The optoelectronic and charge transport properties of these polymers are investigated with a particular focus on their use for organic photovoltaic (OPV) devices in blends with phenyl-C-70-butyric acid methyl ester (PC 70 BM). It is found that the longer C-Ge bond length, in comparison to C-Si, modifies the molecular conformation and leads to a more planar chain conformation in PGeBTBT than PSiBTBT. This increase in molecular planarity leads to enhanced crystallinity and an increased preference for a face-on backbone orientation, thus leading to higher charge carrier mobility in the diode configuration. These results provide important insight into the impact of the heavy atom substitution on the molecular packing and device performance of polymers based on the poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b; 3,4-b]-dithiophene)-alt-4,7-(2,1,3-benzothiadiazole) (PCPDTBT) backbone.
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