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Polymer Classification: Crystallinity

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...

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Updated: May 15, 2025

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

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Acceptor Crystallinity Engineering Enables >20% Efficiency Binary Organic Solar Cells with 83.0% Fill Factor.

Jiawei Deng^1,2,3, Wenhao Li⁴, Rui Zeng²

¹Hangzhou International Innovation Institute, Beihang University, Hangzhou, 311115, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|April 7, 2025

Summary

This summary is machine-generated.

Researchers developed a new method using trichloroethylene (TCE) solvent to improve organic solar cell (OSC) morphology. This boosts efficiency and achieves a record-breaking fill factor (FF) of 83% for organic solar cells.

Keywords:

acceptor fill factor organic solar cells transport phase trap‐assisted recombination

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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
Organic Electronics
Photovoltaics

Background:

Morphology optimization in organic photovoltaic materials is challenging due to differing crystallinities of donor and acceptor components.
Crystalline imperfections lead to trap-assisted recombination, limiting the fill factor (FF) in organic solar cells (OSCs).

Purpose of the Study:

To introduce a method for precise regulation of acceptor crystallinity in OSCs.
To enhance the morphology and performance of organic solar cells through improved acceptor processing.

Main Methods:

Utilized trichloroethylene (TCE) as an upper-layer acceptor processing solvent.
Optimized intermolecular interactions and film-forming processes of acceptor molecules.
Investigated the impact of TCE on active layer morphology and charge transport.

Main Results:

Achieved a power conversion efficiency of 20.05% for binary organic solar cells.
Obtained an unprecedented fill factor (FF) of 83.0%, the highest reported for OSCs.
Demonstrated reduced trap-assisted charge recombination due to improved electron transport pathways.

Conclusions:

The TCE solvent method effectively regulates acceptor crystallinity and improves vertical morphology.
This approach facilitates the construction of efficient charge transport networks in OSCs.
The facile method enables the fabrication of high-efficiency and morphologically stable organic solar cells.