Publication date: 31st March 2013
Short organic bidentate ligands, such as ethanedithiol and mercaptopropionic acid, were found to simultaneously passivate CQD surfaces and densify films within the solid state.Much effort has recently been invested in thesesolid state ligand exchanges, which displace long insulating ligands such as oleic acid, 1-dodecanethiol and replace them with short, strongly-bound, bifunctional ligands. A new approach to CQD film formation was reported. An inorganic CQD film was produced by displacing long, as-synthesized oleic ligands in the solid state, and replacing them instead with halide anions. This approach, known as atomic ligand passivation, led to the highest certified CQD PV efficiency reported, of 5.1%.(ref.1 - 4)
Herein, we propose unlike previous research of PbS CQD sensitized PV cells. Previously, we have reported that the PbS CQD-sensitized PV cells can detect light in the NIR region and multiple layered PbS CQD-sensitized PV cell.(ref.5,11) The QD-sensitized PV cells consist of an electron conductor, a sensitizer (QDs), and a hole conductor. The electrons generated in the sensitizer are injected into the electron conductor and simultaneously the generated holes in the sensitizer are transported to the hole conductor. Accordingly, these types of PV cells could hold a high fill factor once the charge carriers generated in the sensitizer are effectively separated and transported to the electron conductor and the hole conductor, respectively.
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