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P-N junction

P-N junction

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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Well-aligned Vertically Oriented ZnO Nanorod Arrays and their Application in Inverted Small Molecule Solar Cells

Well-aligned Vertically Oriented ZnO Nanorod Arrays and their Application in Inverted Small Molecule Solar Cells

Published on: April 25, 2018

Light absorption and emission in nanowire array solar cells.

Jan Kupec¹, Ralph L Stoop, Bernd Witzigmann

¹Integrated Systems Laboratory, ETH Zurich, Zurich, Switzerland. kupec@iis.ee.ethz.ch

|January 4, 2011

Summary

Inorganic nanowire solar cells offer enhanced light absorption and carrier transport for efficient solar power. Optimizing nanowire diameter and spacing is key to maximizing solar cell efficiency and reducing material usage.

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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

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Published on: August 23, 2012

Area of Science:

Nanotechnology
Renewable Energy
Optics

Background:

Inorganic nanowires are researched for large-scale solar power generation.
Their unique structure allows distinct light absorption and carrier transport pathways.

Purpose of the Study:

Investigate nanowire arrays as photonic devices governed by wave-optical phenomena.
Calculate light absorption efficiency and provide design recommendations for nanowire solar cells.

Main Methods:

Solved Maxwell equations to calculate light absorption efficiency for the AM1.5d spectrum.
Computed the local density of photon states to assess emission enhancement.
Calculated the efficiency limit using the detailed balance framework.

Main Results:

Nanowire solar cells can exceed thin-film devices in absorptivity due to light concentration.
Efficiency is highly sensitive to nanowire diameter and spacing.
Optimal efficiency is not achieved in densely packed arrays; wider spacing can improve performance and reduce material use.

Conclusions:

Nanowire solar cells demonstrate potential for high efficiency and reduced material consumption.
Absorption enhancement and improved carrier generation per material use can outperform thin-film devices.
Design parameters like diameter and spacing are critical for maximizing solar cell performance.