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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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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Photosystem I01:27

Photosystem I

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Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
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Photosystems01:32

Photosystems

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Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
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Radial System Protection01:23

Radial System Protection

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Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
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Si Radial p-i-n Junction Photovoltaic Arrays with Built-In Light Concentrators.

Jinkyoung Yoo1, Binh-Minh Nguyen1, Ian H Campbell2

  • 1†Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States.

ACS Nano
|May 12, 2015
PubMed
Summary

Researchers developed novel silicon wire arrays with match-head structures, significantly boosting solar cell performance. This morphology control enhances light absorption and carrier collection, improving photovoltaic efficiency by 20%.

Keywords:
finite difference time domain calculationphotovoltaicquantum efficiencyradial p-n junctionsilicon nanowire

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • High-performance photovoltaic (PV) devices need strong light absorption and efficient carrier collection.
  • Vertical wire arrays show efficient light absorption, while radial p-n junctions improve carrier collection.
  • Optimizing both light absorption and carrier collection simultaneously offers potential for enhanced PV efficiencies.

Purpose of the Study:

  • To enhance PV performance, light absorption, and quantum efficiency in silicon radial p-i-n junction arrays.
  • To introduce a morphology control concept using match-head structures for improved PV devices.
  • To systematically study design rules for match-head arrays to improve PV performance.

Main Methods:

  • Exploiting surface energy minimization during vapor phase epitaxy to form match-head structures on silicon wires.
  • Fabricating silicon radial p-i-n junction arrays with and without match-head structures.
  • Comparing optical absorptance, external quantum efficiencies, and PV efficiency under AM 1.5G illumination.

Main Results:

  • Match-head structures act as built-in light concentrators.
  • Optical absorptance and external quantum efficiencies increased by 30-40% with match-head structures.
  • Photovoltaic efficiency improved by 20% compared to cylindrical structures without match-heads.

Conclusions:

  • Morphology control via match-head structures significantly enhances silicon radial p-i-n junction array performance.
  • This approach provides a fabrication-compatible method to boost PV efficiency.
  • Process-enhanced control of 3D silicon morphologies is a viable strategy for advanced solar cell development.