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Related Experiment Video

Updated: Mar 31, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Published on: September 8, 2017

Temperature Tunable Self-Doping in Stable Diradicaloid Thin-Film Devices.

Yuan Zhang^1,2, Yonghao Zheng^1,3, Huiqiong Zhou⁴

¹Center for Polymers and Organic Solids, University of California, Santa Barbara, CA, 93106, USA.

Advanced Materials (Deerfield Beach, Fla.)

|October 21, 2015

Summary

Stable diradicaloids exhibit self-doping behavior in electronic devices. This temperature-tunable, reversible process enhances doping with increasing temperature, eliminating transistor off-states.

Keywords:

diradicaloid electrical conductivity self-doping thermal activation

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Area of Science:

Materials Science
Organic Electronics
Solid-State Physics

Background:

Diradicaloids possess stable coexisting close-shell and open-shell electronic configurations.
Self-doping phenomena in organic electronic materials are crucial for device performance.

Purpose of the Study:

To investigate the unconventional self-doping behavior of FDT and FDT-Br diradicaloids.
To explore the temperature dependence and reversibility of this self-doping mechanism.

Main Methods:

Fabrication of solid-state electronic devices utilizing FDT and FDT-Br diradicaloids.
Temperature-dependent electrical characterization of the transistors.

Main Results:

FDT and FDT-Br diradicaloids demonstrate stable coexisting close-shell and open-shell forms.
Unconventional, temperature-tunable, and reversible self-doping behavior was observed.
Increased temperature strengthens the self-doping effect, leading to the absence of off-states (I(off)) in transistors.

Conclusions:

The diradicaloid systems exhibit unique self-doping properties crucial for advanced electronic applications.
Temperature modulation offers a novel strategy to control and enhance doping in organic transistors.
The elimination of off-states suggests potential for highly efficient and low-power electronic devices.