Surface Engineering of Pbs Colloidal Quantum Dots Using Atomic Passivation for Photovoltaic Applications

Solution-processed quantum dots (QDs) have attracted significant attention for the low-cost fabrication of optoelectronic devices. Here, we synthesized PbS QDs via hot injection method and passivated the trap states by using short thiols and dopant elements for photovoltaic application. In order to study the effect of dopants on photovoltaic application, PbS QDs were doped by using three different cations: Cadmium, Calcium, and Zinc. We utilized Time resolvel Photoluminescence measurement to study the carriers lifetime for different samples and found that the carriers life time increases ∼80% by using Cd as a dopant compared with undoped sample. In addition, the results of J-V measurement showed that Cd dopant has a better improvement than Ca and Zn dopants due to the enhancement of the efficiency of PbS QDs solar cell. Finally, we achieved solar power conversion efficiencies of 5.81% using Cd therapy.