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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 22, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Published on: September 12, 2014

All-solid-state dye-sensitized solar cells with high efficiency.

In Chung¹, Byunghong Lee, Jiaqing He

¹Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.

|May 25, 2012

Summary

This summary is machine-generated.

Solid-state dye-sensitized solar cells utilize cesium tin iodide (CsSnI3) as a hole conductor, replacing liquid electrolytes. This innovation improves durability and enhances light absorption for better solar energy conversion.

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Last Updated: May 22, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

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Electrospinning of Photocatalytic Electrodes for Dye-sensitized Solar Cells

Electrospinning of Photocatalytic Electrodes for Dye-sensitized Solar Cells

Published on: June 28, 2017

Area of Science:

Materials Science
Renewable Energy
Photovoltaics

Background:

Dye-sensitized solar cells (DSSCs) offer a low-cost photovoltaic alternative to conventional silicon-based devices.
Current DSSCs face durability issues due to liquid electrolytes, leading to corrosion and leakage.
Existing solid-state DSSC electrolytes show limited efficiency.

Purpose of the Study:

To develop a stable, efficient solid-state dye-sensitized solar cell.
To investigate cesium tin iodide (CsSnI3) as a solid-state hole conductor.
To enhance visible light absorption in the red spectrum for improved solar energy conversion.

Main Methods:

Fabrication of solid-state DSSCs using nanoporous titanium dioxide (TiO2), N719 dye, and CsSnI2.95F0.05 doped with SnF2 as the hole conductor.
Characterization of device performance, including power conversion efficiency.
Analysis of CsSnI3's optical properties, including its bandgap and light absorption spectrum.

Main Results:

Achieved power conversion efficiencies of up to 10.2% (8.51% with mask).
Demonstrated CsSnI3's suitability as a solution-processable p-type semiconductor for hole conduction.
Observed enhanced visible light absorption on the red side of the spectrum due to CsSnI3's 1.3 eV bandgap.

Conclusions:

Solid-state DSSCs utilizing CsSnI3 offer a promising, durable alternative to liquid electrolyte-based devices.
CsSnI3-based DSSCs exhibit competitive conversion efficiencies and improved spectral response.
This research paves the way for more robust and efficient dye-sensitized solar cell technologies.