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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...

Biasing of P-N Junction

Biasing of P-N Junction

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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Related Experiment Video

Updated: Jan 18, 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

In-Plane Ferroelectric p/n Superstructure Photoelectrode for Bias-Free Solar-Fuel Conversion.

Jia Zhao¹, Aiji Wang², Huiya Liu¹

¹School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China.

|September 8, 2025

Summary

This summary is machine-generated.

Researchers created novel ferroelectric p/n homojunctions in bismuth ferrite (BFO) films using oxygen vacancy engineering. This breakthrough enhances solar-fuel conversion efficiency for sustainable energy applications.

Keywords:

Ferroelectric H2O2 Production In-situ Defect Engineering Photoelectrode Superstructure

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Last Updated: Jan 18, 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

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Using Neutron Spin Echo Resolved Grazing Incidence Scattering to Investigate Organic Solar Cell Materials

Using Neutron Spin Echo Resolved Grazing Incidence Scattering to Investigate Organic Solar Cell Materials

Published on: January 15, 2014

Area of Science:

Materials Science
Renewable Energy
Semiconductor Physics

Background:

Multijunction photoelectrodes are crucial for solar-fuel conversion but face doping challenges in metal oxides.
Controllable doping and high-quality growth are key limitations for emerging semiconductor materials.

Purpose of the Study:

To demonstrate in-plane ferroelectric p/n homojunction superstructures in BiFeO3 (BFO) films.
To enable bias-free photoelectrochemical (PEC) reactions for sustainable energy.
To overcome doping limitations in metal oxide semiconductors.

Main Methods:

In situ oxygen vacancy (V_O) engineering for reversible p- and n-type conductivity switching in BFO.
Construction of BFO p/n homojunction superstructures with densely packed depletion regions.
Selective catalyst deposition on p- and n-regions for water splitting.

Main Results:

Achieved a dramatic improvement in carrier collection efficiency.
Demonstrated an 8.6-fold increase in H₂O₂ production compared to p-BFO and 16.7-fold compared to n-BFO.
Facilitated bias-free water splitting through selective catalysis.

Conclusions:

In-plane ferroelectric p/n homojunctions in BFO enable efficient, bias-free PEC reactions.
V_O-mediated conductivity modulation is a viable strategy for other ferroelectric materials.
This approach offers a promising pathway for advanced solar-fuel conversion technologies.