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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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Developing High Performance GaP/Si Heterojunction Solar Cells

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Published on: November 16, 2018

Efficiency dip observed with InGaN-based multiple quantum well solar cells.

K Y Lai, G J Lin, Yuh-Renn Wu

|January 22, 2015

Summary

This summary is machine-generated.

The external quantum efficiency (EQE) dip in InGaN/GaN solar cells lessens with higher indium content. This is due to a balance between light emission and electricity generation, influenced by quantum effects and material variations.

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Area of Science:

Semiconductor Physics
Materials Science
Renewable Energy

Background:

Indium Gallium Nitride (InGaN)/Gallium Nitride (GaN) multiple quantum wells (MQWs) are crucial for solar cell applications.
External Quantum Efficiency (EQE) is a key performance metric for solar cells.
An observed dip in EQE at higher optical power densities can limit solar cell performance.

Purpose of the Study:

To investigate the influence of indium composition on the EQE dip in InGaN/GaN MQW solar cells.
To understand the underlying mechanisms causing the EQE dip.
To identify strategies for mitigating the EQE dip and improving solar cell efficiency.

Main Methods:

Fabrication of InGaN/GaN MQW solar cells with varying indium compositions (15% and 25%).
Measurement of EQE under different incident optical power densities.
Analysis of the relationship between indium composition, optical power, and EQE dip using semiconductor physics principles.

Main Results:

A noticeable dip in EQE was observed for In(0.15)Ga(0.85)N/GaN MQW solar cells as optical power density increased.
Increasing indium composition to 25% significantly reduced the prominence of the EQE dip.
The EQE dip is attributed to the interplay between radiative recombination and photocurrent generation, influenced by quantum-confined Stark effect (QCSE) and composition fluctuations.

Conclusions:

Indium composition in InGaN/GaN MQW solar cells plays a critical role in mitigating the EQE dip.
Optimizing indium content can enhance solar cell performance by balancing recombination and charge generation processes.
Understanding QCSE and composition fluctuations is key to designing efficient nitride-based solar cells.