Journal article
Elucidating Batch-to-Batch Variation Caused by Homocoupled Side Products in Solution-Processable Organic Solar Cells
Hasselt University1
Norwegian University of Science and Technology2
Technische Universität Dresden3
Vrije Universiteit Brussel4
Universite de Mons5
Universite de Namur6
Department of Energy Conversion and Storage, Technical University of Denmark7
Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark8
Conjugated polymers and small molecules based on alternating electron-donating (D) and electron-accepting (A) building blocks have led to state-of-the-art organic solar cell materials governing efficiencies beyond 10%. Unfortunately, the connection of D and A building blocks via cross-coupling reactions does not always proceed as planned, which can result in the generation of side products containing D-D or A-A homocoupling motifs.
Previous studies have reported a reduced performance in polymer and small molecule solar cells when such defect structures are present. A general consensus on the impact of homocouplings on device performance is, however, still lacking as is a profound understanding of the underlying causes of the device deterioration.
For differentiating the combined effect of molecular weight and homocouplings in polymer solar cells, a systematic study on a small molecule system (DTS(FBBTh2)2) is presented. The impact of homocouplings on nanomorphology, thermal, and electro-optical properties is investigated. It is demonstrated that small quantities of homocouplings (
Language: | English |
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Publisher: | American Chemical Society (ACS) |
Year: | 2016 |
Pages: | 9088-9098 |
ISSN: | 15205002 and 08974756 |
Types: | Journal article |
DOI: | 10.1021/acs.chemmater.6b04143 |
ORCIDs: | Andreasen, Jens Wenzel , 0000-0003-1936-9521 , 0000-0003-3678-8875 and 0000-0001-7883-3393 |
Batch-to-batch variations Chemical reactions Conjugated polymers Cross coupling reactions Defects Device performance Electronic properties Electrooptical properties Molecules Nanostructured materials Optical properties Organic polymers Organic solar cells Photoactive layers Polymer solar cells Small molecule systems Solar cell materials Solar cells Solution processable