CUED Publications database

Red green blue emissive lead sulfide quantum dots: heterogeneous synthesis and applications

Hou, B and Cho, Y and Kim, BS and Ahn, D and Lee, S and Park, JB and Lee, YW and Hong, J and Im, H and Morris, SM and Sohn, JI and Cha, SN and Kim, JM (2017) Red green blue emissive lead sulfide quantum dots: heterogeneous synthesis and applications. Journal of Materials Chemistry C, 5. pp. 3692-3698. ISSN 2050-7534

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Visible emission colloidal quantum dots (QDs) have shown promise in optical and optoelectronic applications. These QDs are typically composed of relatively expensive elements in the form of indium, cadmium, and gallium since alternative candidate materials exhibiting similar properties are yet to be realized. Herein, for the first time, we report red green blue (RGB) photoluminescences with quantum yields of 18% from earth-abundant lead sulfide (PbS) QDs. The visible emissive property is mainly attributed to a high degree of crystallinity even for the extremely small QD sizes (1-3 nm), which is realized by employing a heterogeneous reaction methodology at high growth temperatures (>170 °C). We demonstrate that the proposed heterogeneous synthetic method can be extended to the synthesis of other metal chalcogenide QDs, such as zinc sulfide and zinc selenide, which are promising for future industrial applications. More importantly, benefiting from the enlarged band gaps, the as-prepared PbS solar cells show an impressive open circuit voltage (∼0.8 V) beyond that reported to date.

Item Type: Article
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 20 Nov 2018 01:30
Last Modified: 10 Apr 2021 00:47
DOI: 10.1039/C7TC00576H