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Related Experiment Video

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Close-Space Sublimation-Deposited Ultra-Thin CdSeTe/CdTe Solar Cells for Enhanced Short-Circuit Current Density and Photoluminescence
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Interrelation of the CdTe Grain Size, Postgrowth Processing, and Window Layer Selection on Solar Cell Performance.

Thomas P Shalvey1, Heath Bagshaw2, Jonathan D Major1

  • 1Stephenson Institute for Renewable Energy, Department of Physics, University of Liverpool, Liverpool L69 7ZF, U.K.

ACS Applied Materials & Interfaces
|September 9, 2022
PubMed
Summary

Researchers explored alternative window layers for cadmium telluride (CdTe) solar cells, finding that a tin oxide (SnO2) layer with a cadmium selenide (CdSe) interlayer improves CdTe growth and performance. This approach offers a promising path for enhanced solar cell efficiency.

Keywords:
CdSeCdTeSnO2device performancegrain sizeinterfacesolar cell

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Semiconductor Physics

Background:

  • Cadmium telluride (CdTe) solar cells are a key technology in renewable energy.
  • Optimizing the device structure, particularly the window layer, is crucial for improving efficiency.
  • Existing CdTe structures face challenges with parasitic absorption and processing interdependencies.

Purpose of the Study:

  • To investigate the impact of alternative window layers (SnO2, CdSe) on CdTe solar cell performance.
  • To compare device architectures based on CdS, SnO2, and CdSe window layers.
  • To understand the processing requirements for different CdTe solar cell structures.

Main Methods:

  • Fabrication and characterization of three parallel CdTe solar cell device architectures (CdS, SnO2, CdSe).
  • Systematic variation of CdTe deposition rates and post-growth chloride treatments for each structure.
  • Analysis of film growth, junction quality, and material intermixing.

Main Results:

  • Direct replacement of CdS with SnO2 resulted in poor CdTe growth and a weak junction.
  • Inserting a CdSe interlayer between SnO2 and CdTe improved CdTe growth and created a graded CdSeTe absorber.
  • Distinct processing conditions were identified as necessary for each device architecture.

Conclusions:

  • A SnO2/CdSe/CdTe structure offers advantages over traditional CdS/CdTe for CdTe solar cells.
  • Understanding processing-structure-property relationships is vital for optimizing CdTe solar cell fabrication.
  • This work provides insights into tailoring CdTe solar cell processing for improved performance.