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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: Aug 25, 2025

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Published on: March 19, 2017

Wavelength Selective Solar Cells Using Triple Cation Perovskite.

Ahmed Hayali^1,2, Roger J Reeves^2,3, Maan M Alkaisi^1,2

¹Department of Electrical and Computer Engineering, University of Canterbury, Christchurch 8041, New Zealand.

Nanomaterials (Basel, Switzerland)

|October 14, 2022

Summary

Cesium-based hybrid perovskite solar cells were developed with tunable wavelength-selective properties. These efficient, low-cost solar cells achieved efficiencies up to 15.5%, showing promise for various applications.

Keywords:

cesium lead halide solar cells triple-cation perovskite wavelength selectivity

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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

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Published on: February 27, 2017

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Last Updated: Aug 25, 2025

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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Published on: February 27, 2017

Area of Science:

Materials Science
Renewable Energy
Photovoltaics

Background:

Perovskite materials are recognized for their high efficiency and low cost in solar cell applications.
Hybrid perovskite solar cells offer versatility and tunable properties.

Purpose of the Study:

To develop cesium-based hybrid perovskite solar cells with wavelength-selective properties.
To tune the band gap of perovskite materials by altering their composition.

Main Methods:

Compositional tuning using lead(II) iodide (PbI2) and lead(II) bromide (PbBr2).
Characterization using photoluminescence (PL), optical transparency, X-ray diffraction, and external quantum efficiency.
Performance evaluation through illuminated current-voltage characteristics under AM 1.5 conditions.

Main Results:

Photoluminescence peaks were observed at 790 nm for high iodine content and 548 nm for high bromine content.
Materials exhibited selective light absorption between 500 nm and 800 nm, including the visible range (640-660 nm).
Fabricated solar cells achieved an average efficiency ranging from 3.5% to 15.5% based on composition.

Conclusions:

Cesium-based hybrid perovskites can be engineered for specific wavelength selectivity.
These wavelength-selective solar cells hold potential for applications like smart windows and building-integrated photovoltaics.