Charge Carrier Conduction Mechanism in PbS Quantum Dot Solar Cells: Electrochemical Impedance Spectroscopy Study

Haowei Wang, Yishan Wang, Bo He, Weile Li, Muhammad Sulaman, Junfeng Xu, Shengyi Yang*, Yi Tang, Bingsuo Zou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)

Abstract

With its properties of bandgap tunability, low cost, and substrate compatibility, colloidal quantum dots (CQDs) are becoming promising materials for optoelectronic applications. Additionally, solution-processed organic, inorganic, and hybrid ligand-exchange technologies have been widely used in PbS CQDs solar cells, and currently the maximum certified power conversion efficiency of 9.9% has been reported by passivation treatment of molecular iodine. Presently, there are still some challenges, and the basic physical mechanism of charge carriers in CQDs-based solar cells is not clear. Electrochemical impedance spectroscopy is a monitoring technology for current by changing the frequency of applied alternating current voltage, and it provides an insight into its electrical properties that cannot be measured by direct current testing facilities. In this work, we used EIS to analyze the recombination resistance, carrier lifetime, capacitance, and conductivity of two typical PbS CQD solar cells Au/PbS-TBAl/ZnO/ITO and Au/PbS-EDT/PbS-TBAl/ZnO/ITO, in this way, to better understand the charge carriers conduction mechanism behind in PbS CQD solar cells, and it provides a guide to design high-performance quantum-dots solar cells.

Original languageEnglish
Pages (from-to)18526-18533
Number of pages8
JournalACS applied materials & interfaces
Volume8
Issue number28
DOIs
Publication statusPublished - 20 Jul 2016

Keywords

  • colloidal quantum dots (CQDs)
  • electrochemical impedance spectroscopy (EIS)
  • lead sulfide (PbS)
  • recombination resistance
  • solar cell

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