Publication date: 14th September 2021
Lead sulfide (PbS) colloidal quantum dots have attracted various infrared optoelectronic applications due to their wide absorption spectrum. However, they require improved surface passivation, minimized energetic disorder and faster charge transport for high performing optoelectronic devices. In this work, we have used solution processable inorganic PbX2, hybrid MAPbI3 and triple cation CsMAFA based perovskite ligand for photodetector (PD) application and compared it with the performance of silicon PD. The QD based devices cover the entire UV-NIR spectral range with good wavelength sensitivity from 300 nm to 1100 nm. The PDs show a low dark current density, responsivity between 0.3 to 0.4 A/W along with high specific detectivity of over 1013 Jones throughout the spectral range at 0 bias condition. Moreover, these devices shows good stability, their performance is comparable to the Si PD and is one of the highest reported in the literature. Therefore, these results show that the effective passivation method of PbS QDs with appropriate ligands can pave the way for an advancement in the performance of solution processed broadband PD.
SUNRISE and DST for the project funding. NCPRE IITB for providing the characterization facility. IITB-Monash Research Academy for grant of scholarship.
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