Formation of uniform PbS quantum dots by a spin-assisted successive precipitation and anion exchange reaction process using PbX2 (X = Br, I) and Na2S precursors

Jin Hyuck Heo; Min Hyeok Jang; Min Ho Lee; Myoung Sang You; Sang Wook Kim; Jae Joon Lee; Sang Hyuk Im

doi:10.1039/c6ra25637f

Formation of uniform PbS quantum dots by a spin-assisted successive precipitation and anion exchange reaction process using PbX₂ (X = Br, I) and Na₂S precursors

Jin Hyuck Heo, Min Hyeok Jang, Min Ho Lee, Myoung Sang You, Sang Wook Kim, Jae Joon Lee, Sang Hyuk Im

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

We devised a straightforward spin-assisted successive precipitation and anion exchange reaction (spin-SPAER) process in order to deposit relatively uniform PbS quantum dots (QDs) on mesoporous TiO₂ (mp-TiO₂). For the spin-SPAER process, we used PbX₂ (X = I, Br, and Cl) precursors instead of a Pb(NO₃)₂ precursor and consequently deposited individual PbS QDs on mp-TiO₂ due to the suppressed overgrowth of PbS QDs, whereas the conventional spin-assisted successive ionic layer adsorption and reaction (spin-SILAR) process formed aggregated PbS QDs on the mp-TiO₂ surface due to continuous adsorption and reaction. In addition, the PbS QDs prepared by spin-SPAER showed better air stability than the PbS QDs prepared by spin-SILAR possibly due to the passivation by halogen elements such as I and Br. Accordingly, we could improve the overall power conversion efficiency of PbS QD-SSCs prepared by the spin-SPAER process using PbI₂ and PbBr₂ precursors to ∼26.7% and ∼44.2%, respectively, compared to the PbS QD-SSCs prepared by spin-SILAR using the Pb(NO₃)₂ precursor.

Original language	English
Pages (from-to)	3072-3077
Number of pages	6
Journal	RSC Advances
Volume	7
Issue number	6
DOIs	https://doi.org/10.1039/c6ra25637f
Publication status	Published - 2017
Externally published	Yes

Bibliographical note

Funding Information:
This study was supported by Basic Science Research Program (No. 2014R1A5A1009799), the Priority Research Program (2009-0093826) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning and the New & Renewable Energy Core Technology Program (No. 20133030000140) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy.

Publisher Copyright:
© The Royal Society of Chemistry.

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)

Access to Document

10.1039/c6ra25637f

Cite this

@article{10ab38ebdc6048ed85036de78f321658,

title = "Formation of uniform PbS quantum dots by a spin-assisted successive precipitation and anion exchange reaction process using PbX2 (X = Br, I) and Na2S precursors",

abstract = "We devised a straightforward spin-assisted successive precipitation and anion exchange reaction (spin-SPAER) process in order to deposit relatively uniform PbS quantum dots (QDs) on mesoporous TiO2 (mp-TiO2). For the spin-SPAER process, we used PbX2 (X = I, Br, and Cl) precursors instead of a Pb(NO3)2 precursor and consequently deposited individual PbS QDs on mp-TiO2 due to the suppressed overgrowth of PbS QDs, whereas the conventional spin-assisted successive ionic layer adsorption and reaction (spin-SILAR) process formed aggregated PbS QDs on the mp-TiO2 surface due to continuous adsorption and reaction. In addition, the PbS QDs prepared by spin-SPAER showed better air stability than the PbS QDs prepared by spin-SILAR possibly due to the passivation by halogen elements such as I and Br. Accordingly, we could improve the overall power conversion efficiency of PbS QD-SSCs prepared by the spin-SPAER process using PbI2 and PbBr2 precursors to ∼26.7% and ∼44.2%, respectively, compared to the PbS QD-SSCs prepared by spin-SILAR using the Pb(NO3)2 precursor.",

author = "Heo, {Jin Hyuck} and Jang, {Min Hyeok} and Lee, {Min Ho} and You, {Myoung Sang} and Kim, {Sang Wook} and Lee, {Jae Joon} and Im, {Sang Hyuk}",

note = "Funding Information: This study was supported by Basic Science Research Program (No. 2014R1A5A1009799), the Priority Research Program (2009-0093826) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning and the New & Renewable Energy Core Technology Program (No. 20133030000140) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy. Publisher Copyright: {\textcopyright} The Royal Society of Chemistry.",

year = "2017",

doi = "10.1039/c6ra25637f",

language = "English",

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pages = "3072--3077",

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TY - JOUR

T1 - Formation of uniform PbS quantum dots by a spin-assisted successive precipitation and anion exchange reaction process using PbX2 (X = Br, I) and Na2S precursors

AU - Heo, Jin Hyuck

AU - Jang, Min Hyeok

AU - Lee, Min Ho

AU - You, Myoung Sang

AU - Kim, Sang Wook

AU - Lee, Jae Joon

AU - Im, Sang Hyuk

N1 - Funding Information: This study was supported by Basic Science Research Program (No. 2014R1A5A1009799), the Priority Research Program (2009-0093826) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning and the New & Renewable Energy Core Technology Program (No. 20133030000140) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy. Publisher Copyright: © The Royal Society of Chemistry.

PY - 2017

Y1 - 2017

N2 - We devised a straightforward spin-assisted successive precipitation and anion exchange reaction (spin-SPAER) process in order to deposit relatively uniform PbS quantum dots (QDs) on mesoporous TiO2 (mp-TiO2). For the spin-SPAER process, we used PbX2 (X = I, Br, and Cl) precursors instead of a Pb(NO3)2 precursor and consequently deposited individual PbS QDs on mp-TiO2 due to the suppressed overgrowth of PbS QDs, whereas the conventional spin-assisted successive ionic layer adsorption and reaction (spin-SILAR) process formed aggregated PbS QDs on the mp-TiO2 surface due to continuous adsorption and reaction. In addition, the PbS QDs prepared by spin-SPAER showed better air stability than the PbS QDs prepared by spin-SILAR possibly due to the passivation by halogen elements such as I and Br. Accordingly, we could improve the overall power conversion efficiency of PbS QD-SSCs prepared by the spin-SPAER process using PbI2 and PbBr2 precursors to ∼26.7% and ∼44.2%, respectively, compared to the PbS QD-SSCs prepared by spin-SILAR using the Pb(NO3)2 precursor.

AB - We devised a straightforward spin-assisted successive precipitation and anion exchange reaction (spin-SPAER) process in order to deposit relatively uniform PbS quantum dots (QDs) on mesoporous TiO2 (mp-TiO2). For the spin-SPAER process, we used PbX2 (X = I, Br, and Cl) precursors instead of a Pb(NO3)2 precursor and consequently deposited individual PbS QDs on mp-TiO2 due to the suppressed overgrowth of PbS QDs, whereas the conventional spin-assisted successive ionic layer adsorption and reaction (spin-SILAR) process formed aggregated PbS QDs on the mp-TiO2 surface due to continuous adsorption and reaction. In addition, the PbS QDs prepared by spin-SPAER showed better air stability than the PbS QDs prepared by spin-SILAR possibly due to the passivation by halogen elements such as I and Br. Accordingly, we could improve the overall power conversion efficiency of PbS QD-SSCs prepared by the spin-SPAER process using PbI2 and PbBr2 precursors to ∼26.7% and ∼44.2%, respectively, compared to the PbS QD-SSCs prepared by spin-SILAR using the Pb(NO3)2 precursor.

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DO - 10.1039/c6ra25637f

M3 - Article

AN - SCOPUS:85009758689

SN - 2046-2069

VL - 7

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JO - RSC Advances

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