Improving Open-circuit Voltage in PbS-based QDPVs Using Different Pb Precursors

Sangu We; Junyoung Jin; Kyung Seok Lee; Gyu Weon Hwang; Do Kyung Hwang; Jung Hyun Lee

doi:10.3938/jkps.75.985

Improving Open-circuit Voltage in PbS-based QDPVs Using Different Pb Precursors

Sangu We, Junyoung Jin, Kyung Seok Lee, Gyu Weon Hwang, Do Kyung Hwang, Jung Hyun Lee

Department of Chemical and Biological Engineering

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

2 Citations (Scopus)

Abstract

Lead sulfide (PbS) quantum dots (QDs) have been researched for photovoltaic (PV) applications for decades. A large open-circuit voltage (V_oc) deficit to bandgap is one of the drawbacks to overcome in PbS QD-based photovoltaics (QDPVs) compared to other photovoltaic systems. Here, we report the V_oc improvement using a different Pb-precursor, PbCl₂, which is known to have an better native ligand for chemical stability and photoluminescence quantum yield. We synthesized appropriate size of PbS QDs for PV applications by the Cademartiri method with modification. The PbCl₂ precursors used in the Cademartiri method supply chloride ions (Cl⁻) for the atomic passivation. The Cl⁻ as a native atomic ligand is substituted to iodide ions (I⁻) through post-synthesis ligand exchange process, and the remaining Cl⁻ as a PbCl_x shell layer still exists after ligand exchange and passivates the QD surface. The V_oc using PbS QDs from the Cademartiri synthesis is 20% larger than that from the Hines synthesis.

Original language	English
Pages (from-to)	985-989
Number of pages	5
Journal	Journal of the Korean Physical Society
Volume	75
Issue number	12
DOIs	https://doi.org/10.3938/jkps.75.985
Publication status	Published - 2019 Dec 1

Keywords

Lead sulfide
Open-circuit voltage
Photovoltaics
Quantum dots

ASJC Scopus subject areas

Physics and Astronomy(all)

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.3938/jkps.75.985

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title = "Improving Open-circuit Voltage in PbS-based QDPVs Using Different Pb Precursors",

abstract = "Lead sulfide (PbS) quantum dots (QDs) have been researched for photovoltaic (PV) applications for decades. A large open-circuit voltage (Voc) deficit to bandgap is one of the drawbacks to overcome in PbS QD-based photovoltaics (QDPVs) compared to other photovoltaic systems. Here, we report the Voc improvement using a different Pb-precursor, PbCl2, which is known to have an better native ligand for chemical stability and photoluminescence quantum yield. We synthesized appropriate size of PbS QDs for PV applications by the Cademartiri method with modification. The PbCl2 precursors used in the Cademartiri method supply chloride ions (Cl−) for the atomic passivation. The Cl− as a native atomic ligand is substituted to iodide ions (I−) through post-synthesis ligand exchange process, and the remaining Cl− as a PbClx shell layer still exists after ligand exchange and passivates the QD surface. The Voc using PbS QDs from the Cademartiri synthesis is 20% larger than that from the Hines synthesis.",

keywords = "Lead sulfide, Open-circuit voltage, Photovoltaics, Quantum dots",

author = "Sangu We and Junyoung Jin and Lee, {Kyung Seok} and Hwang, {Gyu Weon} and Hwang, {Do Kyung} and Lee, {Jung Hyun}",

note = "Funding Information: The authors acknowledge the financial support from the Korea Institute of Science and Technology (KIST) Institution Program (Grant No. 2E29390) and from the National Research Foundation of Korea (NRF) (Grant No. 2019R1A2B5B02003419). Publisher Copyright: {\textcopyright} 2019, The Korean Physical Society.",

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AU - We, Sangu

AU - Jin, Junyoung

AU - Lee, Kyung Seok

AU - Hwang, Gyu Weon

AU - Hwang, Do Kyung

AU - Lee, Jung Hyun

N1 - Funding Information: The authors acknowledge the financial support from the Korea Institute of Science and Technology (KIST) Institution Program (Grant No. 2E29390) and from the National Research Foundation of Korea (NRF) (Grant No. 2019R1A2B5B02003419). Publisher Copyright: © 2019, The Korean Physical Society.

PY - 2019/12/1

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N2 - Lead sulfide (PbS) quantum dots (QDs) have been researched for photovoltaic (PV) applications for decades. A large open-circuit voltage (Voc) deficit to bandgap is one of the drawbacks to overcome in PbS QD-based photovoltaics (QDPVs) compared to other photovoltaic systems. Here, we report the Voc improvement using a different Pb-precursor, PbCl2, which is known to have an better native ligand for chemical stability and photoluminescence quantum yield. We synthesized appropriate size of PbS QDs for PV applications by the Cademartiri method with modification. The PbCl2 precursors used in the Cademartiri method supply chloride ions (Cl−) for the atomic passivation. The Cl− as a native atomic ligand is substituted to iodide ions (I−) through post-synthesis ligand exchange process, and the remaining Cl− as a PbClx shell layer still exists after ligand exchange and passivates the QD surface. The Voc using PbS QDs from the Cademartiri synthesis is 20% larger than that from the Hines synthesis.

AB - Lead sulfide (PbS) quantum dots (QDs) have been researched for photovoltaic (PV) applications for decades. A large open-circuit voltage (Voc) deficit to bandgap is one of the drawbacks to overcome in PbS QD-based photovoltaics (QDPVs) compared to other photovoltaic systems. Here, we report the Voc improvement using a different Pb-precursor, PbCl2, which is known to have an better native ligand for chemical stability and photoluminescence quantum yield. We synthesized appropriate size of PbS QDs for PV applications by the Cademartiri method with modification. The PbCl2 precursors used in the Cademartiri method supply chloride ions (Cl−) for the atomic passivation. The Cl− as a native atomic ligand is substituted to iodide ions (I−) through post-synthesis ligand exchange process, and the remaining Cl− as a PbClx shell layer still exists after ligand exchange and passivates the QD surface. The Voc using PbS QDs from the Cademartiri synthesis is 20% larger than that from the Hines synthesis.

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KW - Quantum dots

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Improving Open-circuit Voltage in PbS-based QDPVs Using Different Pb Precursors

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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