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Introduction of polysulfide anions to increase the loading quantity of PbS quantum-dots for efficient solid-state quantum-dot sensitized TiO2 nanorod array solar cells

  • Kai Lv
  • Chengwu ShiEmail author
  • Chengfeng Ma
  • Qi Wang
  • Wangchao Chen
Research Paper
  • 87 Downloads

Abstract

To increase the loading quantity of PbS quantum-dots, the polysulfide anion (S22−) was firstly introduced in successive ionic layer absorption and reaction process to prepare PbS quantum-dot thin films on TiO2 nanorod arrays. The influence of polysulfide anion (S22−) concentrations in the precursor solution on the deposition of PbS quantum-dot thin films was systematically investigated and the photovoltaic performance of the corresponding solid-state PbS quantum-dot sensitized solar cells with spiro-OMeTAD was evaluated. The loading quantity and crystallinity of PbS quantum-dots increased with the increase of polysulfide anion (S22−) concentrations from 0 to 1 mM and 2 mM. When the polysulfide anion (S22−) concentration was 1 mM and the surface of TiO2 nanorod arrays was modified by 3-mercaptopropionic acid, the optimal photoelectric conversion efficiency of 4.75% was achieved, along with the open-circuit voltage of 0.56 V, short-circuit photocurrent density of 13.00 mA cm−2 and fill factor of 64.8%. The photoelectric conversion efficiency of 4.75% was relatively high in solid-state PbS quantum-dot sensitized solar cells using successive ionic layer absorption and reactions.

Graphical abstract

To increase the loading quantity of PbS quantum-dots, the polysulfide anion (S22−) was firstly introduced in successive ionic layer absorption and reaction process to prepare PbS quantum-dot thin films on TiO2 nanorod arrays. The optimal photoelectric conversion efficiency of 4.75% was achieved, along with the open-circuit voltage of 0.56 V, short-circuit photocurrent density of 13.00 mA cm−2 and fill factor of 64.8%.

Keywords

Polysulfide anion PbS quantum-dot thin film TiO2 nanorod array Successive ionic layer absorption and reaction Quantum-dot sensitized solar cell Energy conversion 

Notes

Funding information

This work was financially supported by the National Natural Science Foundation of China (51272061, 51472071) and Talent Project of Hefei University of Technology (75010-037004, 75010-037003).

Compliance with ethical standards

Conflict of interest

The authors declare that there is no conflict of interest.

Supplementary material

11051_2018_4446_MOESM1_ESM.doc (414 kb)
ESM 1 (DOC 414 kb)

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  • Kai Lv
    • 1
  • Chengwu Shi
    • 1
    Email author
  • Chengfeng Ma
    • 1
  • Qi Wang
    • 1
  • Wangchao Chen
    • 1
  1. 1.School of Chemistry and Chemical Engineering, Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction EngineeringHefei University of TechnologyHefeiPeople’s Republic of China

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