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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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Related Experiment Video

Updated: May 24, 2026

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

Published on: March 2, 2021

Angular selective semi-transparent photovoltaics.

Brian Roberts¹, D M Nanditha, M Dissanayake

¹Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Avenue, Ann Arbor, Michigan 48109, USA.

|March 16, 2012

Summary

This summary is machine-generated.

This study introduces a novel wavelength and angular selective reflector for semi-transparent photovoltaics. The device enhances energy conversion efficiency by 1.44 times while maintaining high transparency.

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Last Updated: May 24, 2026

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

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Published on: March 2, 2021

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

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Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

Published on: November 5, 2014

Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Semi-transparent photovoltaics face a trade-off between light transmission and absorption, limiting efficiency.
Achieving high transparency often compromises energy conversion in conventional devices.

Purpose of the Study:

To overcome the transparency-efficiency trade-off in semi-transparent photovoltaics.
To propose and demonstrate a wavelength and angular selective reflector for improved solar energy harvesting.

Main Methods:

Utilized high aspect ratio metal nanoparticles to create a selective reflector.
Exploited the anisotropy in localized surface plasmon resonance wavelength.
Engineered the device to harness sunlight at elevated angles.

Main Results:

Demonstrated a device with a wavelength and angular selective reflector.
Achieved a 1.44-fold increase in power conversion efficiency.
Maintained 70% optical transparency at normal incidence.

Conclusions:

The proposed selective reflector effectively addresses the transparency-efficiency trade-off.
Metal nanoparticle-based devices offer a promising route for efficient semi-transparent solar cells.
This technology can enhance solar energy generation in applications requiring transparency.