Effect of different ligand types on sensitivity of infrared photodetectors based on colloidal HgSe quantum dots

•The SCN ligands provide maximum sensitivity of the HgSe quantum dots photodetectors.•EDT < BeSH < S2−< SCN is the general trend for detectivity and responsivity.•The values of responsivity (0.5 A/W) and detectivity (3.1×107 Jones) were obtained.•The SCN ligands provide the lowest Schottky...

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Bibliographic Details
Published in:Infrared physics & technology 2022-06, Vol.123, p.104188, Article 104188
Main Authors: Sokolova, Dina, Dyomkin, Dmitry V., Katsaba, Alexey V., Bocharova, Svetlana I., Razumov, Vladimir F.
Format: Article
Language:English
Subjects:
Colloidal HgSe quantum dots
Infrared photodetector
Ligand exchange
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Summary:•The SCN ligands provide maximum sensitivity of the HgSe quantum dots photodetectors.•EDT < BeSH < S2−< SCN is the general trend for detectivity and responsivity.•The values of responsivity (0.5 A/W) and detectivity (3.1×107 Jones) were obtained.•The SCN ligands provide the lowest Schottky barrier at the HgSe quantum dots/Au junction. The effect of different types of ligands (EDT, BeSH, S2− and SCN) on the sensitivity properties of infrared photodetectors based on colloidal HgSe quantum dots was investigated. Current–voltage characteristics and dependences of the responsivity and detectivity of the photodetectors on the bias voltage were obtained. It was shown that the SCN ligands provided the maximum values of responsivity and detectivity due to the optimal potential barrier between quantum dots and the lowest Schottky barrier at the HgSe quantum dots/Au junction. These values were 0.5 A/W and 3.1 ×107 Jones, respectively.
ISSN:1350-4495
1879-0275
DOI:10.1016/j.infrared.2022.104188