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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 21, 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

Achieving Uniform Phase Structure for Layer-by-Layer Processed Binary Organic Solar Cells with 20.2% Efficiency.

Hao Wang^1,2, Busheng Zhang¹, Liming Wang^3,4

¹Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, P.R. China.

Angewandte Chemie (International Ed. in English)

|May 13, 2025

Summary

This summary is machine-generated.

Researchers developed a novel 3D nanomorphology in organic solar cells (OSCs) using layer-by-layer (LBL) deposition. This unique structure, influenced by the DBM additive, significantly boosts device performance and efficiency.

Keywords:

Aggregation kinetics Layer‐by‐layer deposition Organic solar cells Phase structure Twisted additive

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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
Renewable Energy
Nanotechnology

Background:

Layer-by-layer (LBL) deposition is a promising technique for fabricating organic solar cells (OSCs).
Characterizing and optimizing the 3D morphology of LBL-processed active layers remains a challenge.
The correlation between LBL morphology and photovoltaic properties is not well understood.

Purpose of the Study:

To investigate the morphology and formation mechanisms of LBL-processed active layers using the D18/L8-BO blend.
To understand how morphology influences the photovoltaic properties of organic solar cells.
To explore the role of additives in controlling the nanomorphology.

Main Methods:

Systematic investigation of morphology and formation mechanisms in LBL-processed D18/L8-BO active layers.
Utilizing blend casting for comparison with traditional bulk heterojunction (BHJ) films.
Analyzing the effect of the solid additive DBM on the nanomorphology.

Main Results:

A unique 3D nanomorphology with a uniform, "zigzag"-shaped phase structure was achieved in LBL-processed active layers.
The solid additive DBM, with its twisted conformation, was identified as crucial for uniform phase structure formation.
The 3D morphology significantly improved the short-circuit current and fill factor of the OSCs.
An impressive power conversion efficiency (PCE) of 20.2% was achieved in the binary device.

Conclusions:

Layer-by-layer deposition enables unique 3D nanomorphologies in organic solar cell active layers.
The additive DBM plays a critical role in controlling and optimizing this 3D nanomorphology.
The achieved 3D nanomorphology directly correlates with enhanced photovoltaic performance in OSCs.