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Controlled Synthesis of Near-infrared Quantum Dots for Optoelectronic Devices


We designed a facile approach for the synthesis of PbS quantum dots (QDs) using thiourea and lead acetate as sources for sulfur and lead, respectively. The sizes of the PbS QDs could be systematically controlled by simply adjusting the reaction parameters. Cd post-treatment via a cation exchange method was performed to increase the stability of QDs. As a proof of concept, colloidal PbS QDs synthesized by using air-stable thiourea were employed as light harvesters for both (i) solar driven photoelectrochemical (PEC) hydrogen generation and (ii) QDs sensitized solar cells (QDSSCs). For PEC hydrogen generation, similar saturated photocurrent densities are observed by using thiourea compared to bis(trimethylsilyl) sulfide, which is air-sensitive and unstable. For QDSSCs, the devices fabricated with QDs synthesized from thiourea reveal a better performance compared to devices fabricated with QDs synthesized from traditional bis(trimethylsilyl) sulfide. Our work demonstrates that this synthetic method is a promising alternative to existing methodologies of PbS QDs and holds great potential for future solar technologies.

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Publication details

The article was received on 08 Jul 2017, accepted on 29 Sep 2017 and first published on 12 Oct 2017

Article type: Paper
DOI: 10.1039/C7NR04950A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Controlled Synthesis of Near-infrared Quantum Dots for Optoelectronic Devices

    H. Zhang, G. S. Selopal, Y. Zhou, X. Tong, D. Benetti, L. Jin, F. Navarro-Pardo, Z. Wang, S. Sun, H. Zhao and F. Rosei, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04950A

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