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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 25, 2025

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

Published on: March 2, 2021

Processing the Interlayer and Optimizing the Active Layer by One-Step Dissolution Compensation in Organic Solar

Junying Wu¹, Wenzhi Ma², Tao Li¹

¹Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China.

ACS Applied Materials & Interfaces

|May 28, 2024

Summary

A novel one-step method simplifies organic solar cell fabrication by integrating interlayer processing and active layer morphology optimization. This approach enhances power conversion efficiency and fill factor in organic solar cells.

Keywords:

cathode interlayer dissolution compensation drift-diffusion modeling morphology optimization one-step strategy organic solar cells

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Last Updated: Jun 25, 2025

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

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Published on: March 2, 2021

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

Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization

Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization

Published on: January 29, 2017

Area of Science:

Materials Science
Organic Electronics
Renewable Energy

Background:

High-performance organic solar cells require optimized active layer morphology and electrode interfaces.
Current fabrication methods are often sequential and unpredictable, hindering efficiency.

Purpose of the Study:

To develop a one-step method for simultaneous interlayer fabrication and active layer morphology optimization.
To improve the power conversion efficiency (PCE) and fill factor (FF) of organic solar cells.

Main Methods:

Exploited dissolution compensation by incorporating the active layer's good solvent into the interlayer solution.
Broke orthogonal solvent principles to allow controlled active layer morphology evolution during interface processing.
Tested the method on D18:Y6 and D18:L8-BO material systems.

Main Results:

Achieved significant improvements in short-circuit current density (JSC) and FF.
Increased PCE by approximately 7.5% for both D18:Y6 (17.04% to 18.31%) and D18:L8-BO (17.97% to 19.31%) systems.
Demonstrated the universal applicability of the one-step strategy to diverse organic electronic systems.

Conclusions:

The one-step dissolution compensation method offers a simple, reliable approach for fabricating high-quality interlayers and optimizing active layer morphology.
This strategy is crucial for advancing high-performance organic solar cells and other solution-processable organic electronics.