Solvent Engineering of Lead Sulfide Colloidal Quantum Dots for Optoelectronics
PbS colloidal quantum dots(CQDs)exhibit the peculiar optical properties for optoelectronic devices including their near-infrared absorption,high absorption coefficient,tunable optical bandgaps,multiple exciton generation and solution processability.However,the inherent colloidal stabilities of CQDs hinders their practical applications.Herein,PbS CQDs with good solution stability were prepared by ligand exchanging.Furthermore,n-butylamine/chlorobenzene solvent was employed to enhance solution stability of PbS CQDs which can be stored at low temperature for at least 15 days,while those in n-butylamine solvent cannot be saved for more than 3 days.UV-vis and PL characterization was then employed to compare the optical properties of CQDs in different solvent via complementary analysis and it is found that PbS CQDs in the mixed solvent exhibit excellent size uniformity.Finally,the solar cells based on mixed solvent realize a power conversion efficiency of 5.18％,while the photodetectors also exhibit a higher responsivity of 0.18 A·W-1 and detectivity of 1.05 ×1012 Jones.
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