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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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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
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Boosting Solar Cell Photovoltage via Nanophotonic Engineering.

Y Cui1, D van Dam1, S A Mann2

  • 1Applied Physics, Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

Nano Letters
|September 9, 2016
PubMed
Summary

Nanostructured solar cells achieve higher open circuit voltage (Voc) than planar designs. This enhancement stems from improved light management and reduced recombination in nanostructured indium phosphide (InP) solar cells.

Keywords:
Nanophotonicsnanowiresopen circuit voltagephotovoltagephotovoltaics

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photovoltaics

Background:

  • Optimizing solar cell performance requires approaching the theoretical limit for open circuit voltage (Voc).
  • Planar solar cell architectures face inherent limitations in voltage enhancement.
  • Nanostructuring offers a potential pathway to overcome these limitations.

Purpose of the Study:

  • To experimentally demonstrate that nanostructured layers can achieve a larger Fermi level splitting and thus a higher Voc compared to planar layers.
  • To investigate the impact of nanostructuring on radiative efficiency and recombination mechanisms in solar cells.
  • To assess the general applicability of nanostructuring for enhancing solar cell performance.

Main Methods:

  • Fabrication of tapered indium phosphide (InP) nanowires from planar layers.
  • Direct comparison of photovoltaic performance between planar and nanostructured geometries using identical material quality.
  • Measurement of external radiative efficiency and open circuit voltage (Voc) under 1 sun illumination.

Main Results:

  • Nanostructured InP layers exhibited a 14-fold increase in external radiative efficiency compared to planar layers.
  • A 70 mV enhancement in Voc was achieved for the nanostructured solar cells.
  • The voltage gain is attributed to enhanced photon outcoupling promoting radiative recombination and reduced bulk recombination due to lower active material volume.

Conclusions:

  • Nanostructured layers fundamentally enable larger Fermi level splitting and Voc than planar layers.
  • The observed enhancements in radiative efficiency and Voc are significant for photovoltaic device optimization.
  • These findings are generalizable and hold promise for improving existing high-performance planar solar cells across various materials.