Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 6, Pages 5385-5392Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c00389
Keywords
colloidal quantum dots; solar cells; solid-state ligand exchange; 3-mercaptopropionic acid; 1,2-ethanedithiol
Funding
- King Abdullah University of Science and Technology (KAUST)
- Carbon Electronics Cluster at the North Carolina State University (NCSU)
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Progress in chalcogenide and perovskite CQD optoelectronics has relied to a significant extent on solid-state ligand exchanges (SSEs): the replacement of initial insulating ligands with shorter conducting linkers on CQD surfaces. Herein we develop a mechanistic model of SSE employing 3-mercaptopropionic acid (MPA) and 1,2-ethanedithiol (EDT) as the linkers. The model suggests that optimal linker concentrations lead to efficient exchange, resulting in ca. 200-300 exchanged ligands per CQD, a 50% thickness reduction of the initial film, decreased interdot spacing, a 15 nm red-shift in the excitonic absorption peak, and a 10x reduction in carrier lifetime. It is the combined effect of these physicochemical changes that has traditionally made 1% MPA and 10(-2)% EDT (v:v) the concentrations of choice for efficient CQD optoelectronics.
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