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In Situ Passivation for Efficient PbS Quantum Dot Solar Cells by Precursor Engineering.

Yongjie Wang1,2, Kunyuan Lu1,2, Lu Han1,2

  • 1Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, China.

Advanced Materials (Deerfield Beach, Fla.)
|March 16, 2018
PubMed
Summary

Optimizing lead sulfide quantum dot (PbS QD) synthesis by engineering lead precursors significantly boosts solar cell efficiency. Acetate precursors yield higher power conversion efficiencies (PCEs) compared to oxide precursors.

Keywords:
PbS quantum dotslead sourcessolar cellssurface passivation

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • Current lead sulfide quantum dot (PbS QD) solar cell research focuses on device architecture and surface modification.
  • Optimization of PbS QD synthesis itself is rarely explored, despite its critical role.

Purpose of the Study:

  • To investigate the impact of lead precursor choice on PbS QD synthesis and solar cell performance.
  • To demonstrate the potential of precursor engineering for improving QD solar cell efficiency.

Main Methods:

  • Synthesized PbS QDs using lead oxide (PbO) and lead acetate trihydrate (PbAc2·3H2O) as lead sources.
  • Fabricated and tested QD solar cells based on PbS QDs from different precursors.
  • Analyzed the role of acetate ligands during synthesis and surface passivation.

Main Results:

  • PbS QD solar cells fabricated using lead acetate (PbAc) achieved a power conversion efficiency (PCE) of 10.82%, significantly higher than the 9.39% PCE from lead oxide (PbO).
  • Acetate ligands were found to improve surface coverage, displace hydroxyl ligands, and facilitate subsequent iodide passivation.
  • Systematic investigation revealed precursor engineering as a key factor in device performance.

Conclusions:

  • Lead precursor selection during PbS QD synthesis is a critical, yet often overlooked, factor for enhancing solar cell performance.
  • Acetate-based precursors offer a promising route to high-quality PbS QDs and improved solar cell efficiencies.
  • Further optimization of the initial QD synthesis stage holds potential for breakthrough efficiencies in PbS QD solar cells.