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Core-Shell CdS-Cu₂S Nanorod Array Solar Cells.

Andrew Barnabas Wong1,2, Sarah Brittman1,2, Yi Yu1,2

  • 1†Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.

Nano Letters
|May 21, 2015
PubMed
Summary

Copper sulfide (Cu2S) core-shell nanorods were developed for photovoltaic devices. These nanorod arrays achieved 3.8% power conversion efficiency and show promise for large-area solar cells.

Keywords:
Nanorod arraycopper sulfidecore−shellphotovoltaicsolution processed

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • Copper sulfide (Cu2S) is an earth-abundant p-type semiconductor with potential for photovoltaic devices.
  • A key limitation of Cu2S is its short minority carrier diffusion length, hindering efficient light absorption.
  • Core-shell nanostructures offer a solution by decoupling light absorption and charge collection lengths.

Purpose of the Study:

  • To fabricate Cu2S-based core-shell nanorod arrays for photovoltaic applications.
  • To investigate the performance and stability of ensemble-level devices made from these nanostructures.
  • To advance the development of solution-processed, large-area nanostructured solar cells.

Main Methods:

  • Cation exchange was employed on cadmium sulfide (CdS) nanorod arrays to create CdS-Cu2S core-shell nanorods.
  • Ensemble-level photovoltaic devices were fabricated from the resulting nanorod arrays.
  • Device performance (power conversion efficiency) and stability were evaluated.

Main Results:

  • Well-defined CdS-Cu2S core-shell nanorod arrays were successfully synthesized.
  • The fabricated core-shell nanorod array devices achieved power conversion efficiencies up to 3.8%.
  • The devices demonstrated stability when measured in air after storage.

Conclusions:

  • Solution-processed CdS-Cu2S core-shell nanorod arrays represent a viable approach for photovoltaic applications.
  • These findings are a significant step towards developing large-area, nanostructured copper sulfide-based solar cells.
  • The core-shell geometry effectively addresses the limitations of Cu2S in photovoltaic devices.