Ligand cleavage enables formation of 1,2-ethanedithiol capped colloidal quantum dot solids
| Autor: | Yiying Li, Nathan J. Spear, Edward H. Sargent, Olivier Ouellette, Rafael Quintero-Bermudez, James Z. Fan, Zheng-Hong Lu, Andrew D. La Croix, Janet E. Macdonald, Larissa Levina, Nicole M. Jenkinson, Zhenyu Yang, Emma Howard |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
1 2-Ethanedithiol Hole transport layer Cleavage (crystal) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Active layer chemistry.chemical_compound Colloid chemistry Quantum dot Fabrication methods Molecule General Materials Science 0210 nano-technology |
| Zdroj: | Nanoscale. 11:10774-10781 |
| ISSN: | 2040-3372 2040-3364 |
| DOI: | 10.1039/c9nr02708d |
| Popis: | Colloidal quantum dots have garnered significant interest in optoelectronics, particularly in quantum dot solar cells (QDSCs). Here we report QDSCs fabricated using a ligand that is modified, following film formation, such that it becomes an efficient hole transport layer. The ligand, O-((9H-fluoren-9-yl)methyl) S-(2-mercaptoethyl) carbonothioate (FMT), contains the surface ligand 1,2-ethanedithiol (EDT) protected at one end using fluorenylmethyloxycarbonyl (Fmoc). The strategy enables deprotection following colloidal deposition, producing films containing quantum dots whose surfaces are more thoroughly covered with the remaining EDT molecules. To compare fabrication methods, we deposited CQDs onto the active layer: in one case, the traditional EDT-PbS/EDT-PbS is used, while in the other EDT-PbS/FMT-PbS is used. The devices based on the new EDT/FMT match the PCE values of EDT/EDT controls, and maintain a higher PCE over an 18 day storage interval, a finding we attribute to an increased thiol coverage using the FMT protocol. |
| Databáze: | OpenAIRE |
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