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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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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

Recent Advances in Solution-Processable Small-Molecule Cathode Interfacial Layers for Organic Solar Cells.

Wen-Jing Sun¹, Xing-Hao Cui¹, Bo-Zhou Chen¹

¹State Key Laboratory of Natural Product Chemistry, Key Laboratory of Special Function Materials and Structure Design (MOE), College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.

ACS Applied Materials & Interfaces

|December 17, 2025

Summary

Solution-processable small-molecule cathode interfacial materials (CIMs) enhance organic solar cell (OSC) performance and stability. This review details molecular design strategies and commercial potential for advanced OSC applications.

Keywords:

cathode interfacial layers efficiency organic solar cells small-molecule cathode interfacial materials stability

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Area of Science:

Materials Science
Organic Electronics
Sustainable Energy

Background:

Organic solar cells (OSCs) are a key sustainable energy technology.
Cathode interfacial layers (CILs) are crucial for OSC efficiency and stability.
Solution-processable small-molecule cathode interfacial materials (CIMs) offer significant advantages.

Purpose of the Study:

To review recent advancements in solution-processable small-molecule CIMs for OSCs.
To analyze structure-property-application relationships in CIMs.
To evaluate the commercial viability of small-molecule CIMs.

Main Methods:

Systematic discussion of nonconjugated and conjugated small-molecule CIMs.
Focus on perylene diimide (PDI) and naphthalene diimide (NDI) based materials.
Examination of emerging conjugated materials with novel backbones.

Main Results:

Molecular design strategies (backbone engineering, side-chain functionalization, self-doping) significantly impact interfacial properties and device performance.
Small-molecule CIMs demonstrate tunable optoelectronic properties, high purity, and excellent reproducibility.
Established clear structure-property-application relationships for effective CIM development.

Conclusions:

Small-molecule CIMs hold significant commercial potential due to synthetic scalability, cost-effectiveness, and stability.
Bridging fundamental research with processing requirements is key for industrial application of high-performance OSCs.
Continued development of small-molecule CIMs will drive innovation in sustainable energy technology.