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Related Concept Videos

P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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High-Efficiency Bifacial Dye-Sensitized Solar Cells for Application under Indoor Light Conditions.

Shanmuganathan Venkatesan1, Wei-Hsun Lin1, Hsisheng Teng1,2

  • 1Department of Chemical Engineering , National Cheng Kung University , Tainan 70101 , Taiwan, R.O.C.

ACS Applied Materials & Interfaces
|October 17, 2019
PubMed
Summary

High-efficiency dye-sensitized solar cells (DSSCs) were optimized for indoor lighting, achieving up to 24.52% power conversion efficiency. These stable, bifacial solar cells demonstrate excellent performance and durability.

Keywords:
bifacial DSSCscobalt redox coupleindoor lightliquid electrolytethin Pt layer

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Area of Science:

  • Materials Science
  • Renewable Energy Technologies
  • Photovoltaics

Background:

  • Dye-sensitized solar cells (DSSCs) are a promising photovoltaic technology for indoor applications.
  • Optimizing DSSC components is crucial for enhancing efficiency and stability under varying light conditions.

Purpose of the Study:

  • To develop high-efficiency, stable bifacial dye-sensitized solar cells (DSSCs) for indoor light conditions.
  • To systematically optimize DSSC components including electrolytes, photoanodes, and counter electrodes for maximum performance.

Main Methods:

  • Utilized a 3-methoxypropionitrile solvent and cobalt redox couples for electrolyte preparation.
  • Regulated electrolyte composition (Co (II/III) ratio, 4-tert-butylpyridine concentration), photoanode (TiO2 layer thickness), and counter electrode (Pt layer thickness).
  • Fabricated semitransparent bifacial DSSCs by omitting the TiO2 scattering layer and using ultrathin Pt films.

Main Results:

  • Achieved a maximum power conversion efficiency of 24.52% under 999.6 lx T5 illumination with optimized components.
  • Identified optimal conditions: Co (II/III) ratio of 0.11/0.025 M, 1.2 M 4-tert-butylpyridine, Y123 dye, 0.16 nm Pt CE, and 10 μm TiO2 photoanode.
  • Demonstrated semitransparent bifacial DSSCs with 8 μm TiO2 main layer and 0.55 nm Pt film achieved 20.65% (front) and 17.31% (back) efficiency under 200 lx T5 light, with high stability at 35°C and 50°C.

Conclusions:

  • Optimized DSSC components significantly enhance power conversion efficiency and stability for indoor applications.
  • The developed bifacial DSSCs exhibit excellent performance under low-light conditions and long-term operational stability.
  • Thin platinum films offer a balance of high transmittance and catalytic activity crucial for semitransparent bifacial DSSCs.