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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: Jun 10, 2026

Digital Printing of Titanium Dioxide for Dye Sensitized Solar Cells

Digital Printing of Titanium Dioxide for Dye Sensitized Solar Cells

Published on: May 4, 2016

Device physics of dye solar cells.

Janne Halme¹, Paula Vahermaa, Kati Miettunen

¹Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 AALTO, Finland. janne.halme@tkk.fi

Advanced Materials (Deerfield Beach, Fla.)

|August 19, 2010

Summary

This study presents a user-friendly device model for nanostructured dye solar cells (DSCs), linking material properties to cell efficiency. It details how electrochemical impedance spectroscopy (EIS) and other methods quantify performance losses in DSCs.

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Published on: September 12, 2014

Area of Science:

Materials Science
Electrochemistry
Renewable Energy

Background:

Designing efficient nanostructured dye solar cells (DSCs) necessitates understanding the relationship between material characteristics and overall cell performance.
Current modeling and characterization techniques for DSCs require integration for effective device development.

Purpose of the Study:

To provide a comprehensive overview of modeling and characterization for DSCs.
To develop a user-friendly DSC device model integrating fundamental and practical aspects.
To establish guidelines for an effective feedback loop in DSC testing and development.

Main Methods:

Derivation of mathematical expressions for the current-voltage (IV) curve and differential resistance of DSC components based on physical and electrochemical principles.
Explanation of the relationship between derived mathematical expressions and electrochemical impedance spectroscopy (EIS).
Determination of model parameters using current-dependent EIS, incident-photon-to-collected-electron (IPCE) measurements, and optical characterization.

Main Results:

A detailed discussion and clarification of the underlying physics governing DSC performance.
Demonstration of how model parameters can be extracted from complete DSCs.
Quantification of performance losses in DSCs using the developed model and characterization techniques.

Conclusions:

The integrated device model provides a theoretical background and practical guidelines for DSC development.
The methodology allows for effective feedback loops in testing and optimizing DSCs.
Understanding the link between material properties and cell efficiency is crucial for advancing DSC technology.