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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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Updated: Apr 3, 2026

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

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Published on: August 23, 2012

Solar thermophotovoltaic system using nanostructures.

Craig Ungaro, Stephen K Gray, Mool C Gupta

|September 26, 2015

Summary

This study demonstrates a highly efficient solar thermophotovoltaic (STPV) system, achieving 6.2% power conversion efficiency. Researchers investigated system losses and proposed mitigation strategies for enhanced solar energy conversion.

Area of Science:

Renewable Energy
Photovoltaics
Thermodynamics

Background:

Solar thermophotovoltaic (STPV) systems offer a promising avenue for efficient solar energy conversion.
Optimizing STPV system design is crucial for maximizing power output and economic viability.
Understanding and mitigating energy losses are key challenges in STPV research.

Purpose of the Study:

To present experimental results of a highly efficient solar thermophotovoltaic (STPV) system.
To match experimental data with a thermodynamic model for loss analysis.
To identify and propose solutions for mitigating losses in STPV systems.

Main Methods:

Utilized a simulated solar energy source for system testing.
Employed a planar tungsten absorber/emitter with specialized surface coatings.

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Integrated a Gallium Antimonide (GaSb) photovoltaic cell for radiation capture.

Main Results:

Achieved an overall power conversion efficiency of 6.2% under solar simulation.
Validated experimental findings with a thermodynamic model.
Identified key loss mechanisms within the STPV system.

Conclusions:

The developed STPV system demonstrates high efficiency and stability.
The proposed design is simple, cost-effective, and requires no moving parts.
Further optimization can lead to even greater solar energy conversion efficiencies.