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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 5, 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

Binary Organic Solar Cells with 19.2% Efficiency Enabled by Solid Additive.

Jianqiu Wang¹, Yafei Wang^1,2, Pengqing Bi¹

¹State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, China.

Advanced Materials (Deerfield Beach, Fla.)

|March 25, 2023

Summary

This summary is machine-generated.

Researchers developed a new method using 3,5-dichlorobromobenzene (DCBB) to enhance the morphology of bulk-heterojunction organic solar cells (OSCs). This approach significantly boosts power conversion efficiency and photostability, paving the way for practical applications.

Keywords:

large-area modules morphology control organic solar cells power conversion efficiency solid additive

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Area of Science:

Materials Science
Organic Electronics
Photovoltaics

Background:

Morphology control is crucial for high-performance bulk-heterojunction organic solar cells (OSCs).
Existing methods often face challenges in achieving optimal morphology for efficiency and stability.

Purpose of the Study:

To investigate the use of 3,5-dichlorobromobenzene (DCBB) as a processing additive to optimize BHJ morphology in OSCs.
To enhance the power conversion efficiency (PCE) and photostability of OSCs.

Main Methods:

Systematic simulations to analyze DCBB's charge distribution and non-covalent interactions.
Experimental processing of PBQx-TF:eC9-2Cl active layers with DCBB.
Performance and stability testing of the fabricated OSC devices.

Main Results:

DCBB addition effectively tuned PBQx-TF:eC9-2Cl aggregation, improving phase separation and molecular packing.
Achieved a certified power conversion efficiency of 19.0%, the highest for binary OSCs.
Demonstrated superior photostability and potential for large-area device printing.

Conclusions:

3,5-dichlorobromobenzene is a cost-effective and volatile additive for controlling BHJ morphology.
DCBB processing offers a facile approach to enhance photovoltaic performance and operational stability in OSCs.
The method shows universality across different BHJ systems, highlighting its broad applicability.