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

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)985-989
Number of pages5
JournalJournal of the Korean Physical Society
Volume75
Issue number12
DOIs
Publication statusPublished - 2019 Dec 1

Keywords

  • Lead sulfide
  • Open-circuit voltage
  • Photovoltaics
  • Quantum dots

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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