Effect of chloride treatment on optical and electrical properties of PbS quantum dots
[Display omitted] •A simple chloride treatment on colloidal PbS quantum dots is demonstrated.•The chloride treatment enhances photoluminescence of colloidal PbS quantum dots.•Pre-chloride passivation enhances hole mobility of quantum dot solids.•The doping polarity is switched from p-type to ambipol...
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| Published in: | Chemical physics 2020-10, Vol.538, p.110895, Article 110895 |
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| Main Authors: | , , |
| Format: | Article |
| Language: | eng |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | [Display omitted]
•A simple chloride treatment on colloidal PbS quantum dots is demonstrated.•The chloride treatment enhances photoluminescence of colloidal PbS quantum dots.•Pre-chloride passivation enhances hole mobility of quantum dot solids.•The doping polarity is switched from p-type to ambipolar.
The relation between surface chemistry and (Opto)electrical properties of lead sulfide quantum dots (PbS QDs) is of importance for the development of cost-effective field-effect transistor (FETs) and quantum dot solar cells. Herein, simple chloride surface treatment has been demonstrated by adding tetramethylammonium chloride (TMACl) into a QD washing step. Absorption, photoluminescence (PL) and X-ray photoelectron spectroscopic studies revealed that Cl− ions bound strongly to PbS QDs surfaces resulting in enhanced PL of colloidal QDs. Furthermore, FET studies on PbS QD thin films fabricated by an identical solid-state ligand exchanging with 1,2-ethanedithiol (EDT) showed that TMACl treatment enhanced hole mobility by ten times and at the same time switched the EDT-treated QD thin film from p-type to ambipolar semiconductor with electron mobility of 2.8 × 10−2 cm2V−1s−1. The results demonstrated herein offer a simple treatment for the fabrication of multiple QD junctions with minor change in processing. |
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| ISSN: | 0301-0104 |