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Efficient, stable infrared photovoltaics based on solution-cast colloidal quantum dots.

Ghada I Koleilat1, Larissa Levina, Harnik Shukla

  • 1Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.

ACS Nano
|February 12, 2009
PubMed
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Stable, solution-processed infrared solar cells achieve 3.6% efficiency using lead selenide (PbSe) quantum dots. Device stability is enhanced with a bidentate linker, enabling efficient charge diffusion for high performance.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • The infrared spectrum contains significant solar energy, making infrared photovoltaics crucial for efficient solar power conversion.
  • Current progress in flexible solar cells is limited to visible light absorption, hindering optimal energy harvesting.
  • Colloidal quantum dots offer a promising route for developing solution-processed infrared solar cells.

Purpose of the Study:

  • To develop stable, solution-processed infrared photovoltaic devices with high power conversion efficiency.
  • To investigate the physical mechanisms governing charge transport in lead selenide (PbSe) quantum dot solar cells.
  • To enhance the stability and performance of infrared solar cells through material engineering.

Main Methods:

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  • Fabrication of photovoltaic devices using solution-processed lead selenide (PbSe) colloidal quantum dots.
  • Incorporation of a strongly bound bidentate linker (benzenedithiol) to improve device stability.
  • Characterization of device performance, including power conversion efficiency and external quantum efficiency across visible and infrared spectra.
  • Analysis of charge transport mechanisms, distinguishing between drift and diffusion.

    • Main Results:

    • Achieved a 3.6% power conversion efficiency in stable, solution-processed infrared photovoltaic devices.
    • Demonstrated device stability over weeks, attributed to the use of benzenedithiol linker.
    • Reached external quantum efficiencies of 46% in the infrared and 70% across the visible spectrum.
    • Identified charge diffusion over hundreds of nanometers as the primary mechanism for high external quantum efficiencies in PbSe quantum dot solids.

    Conclusions:

    • Solution-processed PbSe colloidal quantum dot solar cells represent a viable technology for efficient infrared energy harvesting.
    • The use of specific linkers and understanding charge diffusion are key to developing stable and high-performance infrared photovoltaics.
    • This work advances the field of low-cost, flexible solar cells by enabling efficient utilization of the infrared solar spectrum.