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Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices
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Interface Engineering in Inorganic-Absorber Nanostructured Solar Cells.

Katherine E Roelofs1,2, Thomas P Brennan2, Stacey F Bent2

  • 1†Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States.

The Journal of Physical Chemistry Letters
|August 14, 2015
PubMed
Summary

Interfacial surface treatments enhance nanostructured solar cells, like quantum-dot-sensitized solar cells (QDSSCs), by improving electronic properties and boosting efficiency. These modifications address recombination issues in emerging photovoltaic technologies.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Nanostructured solar cells offer a low-cost alternative to traditional thin-film technologies.
  • Inorganic semiconductor absorbers in nanostructured devices exhibit favorable properties.
  • Quantum-dot-sensitized solar cells (QDSSCs), extremely thin absorber solar cells (ETASCs), and colloidal quantum dot solar cells (CQDSCs) are key examples.

Purpose of the Study:

  • To explore interfacial surface treatments for improving nanostructured solar cell performance.
  • To detail mechanisms of three interfacial modification strategies.
  • To highlight the significance of these advancements for the photovoltaics community.

Main Methods:

  • Focus on three interfacial modification techniques: band alignment via molecular dipoles, ligand exchange for improved colloidal quantum dot (CQD) film mobility, and interfacial inorganic layers for reduced recombination.
  • Analyze underlying mechanisms through select examples.
  • Review existing literature on QDSSCs, ETASCs, and CQDSCs.

Main Results:

  • Interfacial treatments effectively improve electronic properties of nanostructured solar cells.
  • Molecular dipole layers aid in band alignment.
  • Ligand exchange enhances charge carrier mobility in CQD films.
  • Inorganic interfacial layers reduce charge recombination.

Conclusions:

  • Interfacial surface modifications are crucial for enhancing the efficiency of nanostructured solar cells.
  • These strategies address inherent limitations like high recombination rates.
  • Advancements in QDSSCs, ETASCs, and CQDSCs through surface engineering benefit the broader field of photovoltaics.