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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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3D-printed external light trap for solar cells.

Lourens van Dijk1, Ulrich W Paetzold2, Gerhard A Blab3

  • 1Nanophotonics - Physics of Devices, Debye Institute for Nanomaterials Science Utrecht University, High Tech Campus, Building 21 AE Eindhoven 5656 The Netherlands.

Progress in Photovoltaics
|September 27, 2016
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Summary
This summary is machine-generated.

A novel 3D-printed external light trap significantly boosts solar cell performance by retro-reflecting escaping light. This innovation enhances photocurrent and power conversion efficiency without affecting the solar cell

Keywords:
3D printinganti‐reflectioncompound parabolic concentrator (CPC)external light trappingthin‐film solar cells

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Renewable Energy

Background:

  • Conventional light trapping methods can impact solar cell material quality.
  • Enhancing light absorption is crucial for improving solar cell efficiency.
  • Optical losses limit the performance of thin-film solar cells.

Purpose of the Study:

  • To develop and evaluate a universally applicable 3D-printed external light trap for solar cells.
  • To improve light absorption and reduce optical losses in solar cells.
  • To investigate the impact of external light trapping on solar cell performance.

Main Methods:

  • Designed and 3D-printed an external light trap comprising a reflective parabolic concentrator and a reflective cage.
  • Integrated the light trap onto the sun-facing surface of a thin-film nanocrystalline silicon (nc-Si:H) solar cell.
  • Measured improvements in photocurrent and power conversion efficiency.
  • Developed a theoretical model to predict absorption enhancement and analyzed angle of incidence effects.

Main Results:

  • A 15% improvement in both photocurrent and power conversion efficiency was measured for the nc-Si:H solar cell.
  • The external light trap effectively reduces optical losses by enabling multiple light traversals within the cell.
  • The theoretical model showed good agreement with empirical data for path length enhancement.

Conclusions:

  • The 3D-printed external light trap offers a non-invasive method to enhance solar cell absorption and efficiency.
  • This technology is applicable to various solar cell types without compromising their intrinsic properties.
  • External light trapping presents a promising strategy for advancing photovoltaic performance.