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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 6, 2025

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

Published on: January 10, 2017

High-Efficiency Triple-Junction Polymer Solar Cell: A Theoretical Approach.

Fazli Sattar¹, Xiaozhuang Zhou¹, Zakir Ullah²

¹Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.

Molecules (Basel, Switzerland)

|November 27, 2024

Summary

This study designs a triple-junction polymer solar cell using novel donor materials and PC71BM acceptor. The innovative multi-junction approach enhances light absorption and charge separation for improved power conversion efficiency in solar energy technologies.

Keywords:

DFT HOMO LUMO TD-DFT UV-Vis solar cell

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Last Updated: Jun 6, 2025

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

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Published on: January 10, 2017

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

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Published on: September 12, 2014

Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

Published on: November 5, 2014

Area of Science:

Materials Science
Renewable Energy
Organic Electronics

Background:

Polymer solar cells (PSCs) offer a low-cost alternative to silicon-based photovoltaics.
Enhancing power conversion efficiency (PCE) in PSCs is crucial for their commercial viability.
Multi-junction architectures are a promising strategy for broader solar spectrum utilization.

Purpose of the Study:

To theoretically design and evaluate a novel triple-junction polymer solar cell architecture.
To optimize light harvesting and charge separation across different solar spectrum regions.
To explore the potential of specific polymer donor materials for high-efficiency PSCs.

Main Methods:

Density Functional Theory (DFT) simulations were employed for theoretical design.
Time-Dependent DFT (TD-DFT) methods were used to analyze electronic and optical properties.
Key photovoltaic parameters including molecular geometry, UV-Vis spectra, and charge transport were investigated.

Main Results:

A triple-junction device architecture was proposed with specific band gaps (1.9 eV, 1.63 eV, 1.33 eV) for front, middle, and back layers.
Oligomers of PDCBT, PPDT2FBT, and PDPP3T were identified as suitable donor materials.
PC71BM was utilized as the electron acceptor material.

Conclusions:

The proposed triple-junction design demonstrates potential for enhanced solar energy absorption and charge separation.
This architecture offers a promising route to achieving higher power conversion efficiencies in polymer solar cells.
The study contributes to the advancement of renewable energy technologies through innovative organic photovoltaic design.