Publication date: 1st April 2013
PbS colloidal quantum dot (CQD) photovoltaic (PV) cells have relied on the use of organic ligands to passivate the surface of the nanoparticles. These capping groups serve to mediate Nanocrystal(NC) growth, stabilize NCs in solution, and passivate surface electronic states in NCs. NCs ligand interactions determine the electrical properties and fundamentally the power conversion efficiency of CQD solar cells. Recently, A halide ligand CQD film was produced by dis-placing long, as-synthesized oleic ligands in the solid state, and replacing them instead with halide anions. Halide ligand strategy that makes use of monovalent Halide ligands to enhance electronic transport and successfully passivate surface. Here our established PbS colloidal quantum dot -sensitized inorganic-organic heterojunction solar cells made from a combinationof PbS CQDs and Halide ligand, have combined effects of showed better device air stability with aging time under ambient conditions without encapsulation and increasing the short-circuit current (Jsc). In this poster, we solve the air stability issue of the PbS CQD solar cells. We have seen that the fabrication of Halide ligand treatment in PbS colloidal quantum dot-sensitized solar cells (CQDSSCs), can successfully replace long organic bulky group to prevent the steric hindrance effect.
Mechanism of the passivation of the PbS CQDs electron-hole transfer.
Zhijun N.; Yuan R.; Sjored H.; Oleksandr V.; Larissa L.; E. H. Sargent All-Inorganic Colloidal Quantum Dot Photovoltaics Employing Solution-Phase Halide Passivation. Adv. Mater. 2012, 24, 6295
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