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Spontaneously Formed Orientation Polarization Thin Films for Engineering Organic-Organic Interfaces.

Masaki Tanaka¹, Rena Sugimoto¹, Nobuhumi Nakamura¹

¹Department of Biotechnology and Life Science, Faculty of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan.

Small (Weinheim an Der Bergstrasse, Germany)

|February 9, 2026

Summary

Researchers developed new polar molecules for vacuum-deposited films, achieving record surface potential growth rates. These molecules enhance organic device performance by controlling charge transfer and energy levels at interfaces.

Keywords:

molecular orientation photovoltaics spontaneous orientation polarization vacuum deposition

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Area of Science:

Materials Science
Organic Electronics
Surface Chemistry

Background:

Spontaneous orientation polarization (SOP) in polar molecules involves aligning permanent dipole moments relative to a substrate surface in vacuum-deposited films.
SOP is driven by asymmetric intermolecular interactions occurring during film formation on surfaces.
Controlling molecular orientation is key to tailoring the properties of organic electronic devices.

Purpose of the Study:

To develop novel polar molecules exhibiting high structural asymmetry for enhanced SOP.
To investigate the impact of these SOP molecules on surface potential and film properties.
To evaluate the influence of SOP interlayers on the performance of organic thin-film devices.

Main Methods:

Synthesizing polar molecules incorporating multiple fluoroalkyl groups to increase structural asymmetry.
Fabricating vacuum-deposited films using the developed SOP molecules.
Measuring surface potential growth rate relative to film thickness.
Integrating dipolar layers into hole-only devices and organic photovoltaics.

Main Results:

The developed SOP molecules demonstrated high dipole orientation degrees in vacuum-deposited films.
A record high surface potential growth rate exceeding -350 mV nm⁻¹ was achieved.
Device performance in organic thin-film devices was significantly influenced by SOP polarity.
The study confirmed the crucial role of SOP in charge transfer and energy level alignment.

Conclusions:

Novel SOP molecules with high structural asymmetry can be effectively developed.
These molecules enable the formation of highly anisotropic glassy films with superior properties.
The findings offer a pathway to improved performance in organic electronic devices through controlled interfacial polarization.