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Wavefunction engineering for efficient photoinduced-electron transfer in CuInS2 quantum dot-sensitized solar cells.

Jianhui Sun1,2, Limin An1, Gaopeng Xue3

  • 1College of Physical Science and Technology, Heilongjiang University, Harbin 150080, People's Republic of China.

Nanotechnology
|February 11, 2020
PubMed
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Surface defects and band offsets critically impact photoinduced-electron transfer (PET) in quantum dot-sensitized solar cells (QDSSCs). Optimizing core/shell structures, like CuInS2/CdS, enhances PET efficiency for better QDSSC performance.

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Nanotechnology

Background:

  • Quantum dot-sensitized solar cells (QDSSCs) rely on efficient photoinduced-electron transfer (PET) for high performance.
  • Surface defects and energy level alignment (conduction-band offsets) in quantum dots (QDs) are critical factors influencing PET efficiency.

Purpose of the Study:

  • To investigate the impact of surface defects and conduction-band (CB) offsets on PET efficiency in CuInS2 quantum dots (QDs).
  • To elucidate the mechanisms governing PET in core/shell QD structures for improved QDSSC performance.

Main Methods:

  • Time-resolved femtosecond transient absorption spectroscopy.
  • Nanosecond photoluminescence spectroscopy.
  • Fabrication and characterization of CuInS2/ZnS and CuInS2/CdS core/shell QDs.

Main Results:

  • Surface electron trapping significantly reduces PET efficiency in CuInS2 QDs.
  • ZnS passivation suppresses trapping but lowers PET efficiency due to reduced surface electron density.
  • Reducing CB offset in CuInS2/CdS QDs enhances PET efficiency to ~95% via improved passivation and electron wavefunction delocalization.

Conclusions:

  • Surface passivation and controlled CB offsets are crucial for efficient PET in QDSSCs.
  • CuInS2/CdS core/shell QDs demonstrate a viable strategy for high-efficiency QDSSC development.
  • Understanding PET mechanisms is key to advancing QDSSC technology.