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Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

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Recent Progress in High-Mobility Organic Transistors: A Reality Check.

Alexandra F Paterson¹, Saumya Singh², Kealan J Fallon³

¹Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia.

Advanced Materials (Deerfield Beach, Fla.)

|July 20, 2018

Summary

Organic thin-film transistors (OTFTs) show overestimated mobility due to a common nonlinearity. This review analyzes 30 years of data to reveal actual progress and challenges in achieving reliable charge carrier mobility for next-generation organic semiconductors.

Keywords:

carrier mobility charge transport contact resistance organic field-effect transistors organic semiconductors

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Area of Science:

Materials Science
Organic Electronics
Semiconductor Physics

Background:

Significant research has focused on enhancing charge carrier mobility in organic thin-film transistors (OTFTs) over three decades.
A common nonlinearity in OTFTs, the "kink" or "double slope," leads to overestimated mobility values, impacting literature reliability.

Purpose of the Study:

To critically review 30 years of published data on OTFTs to assess the extent of mobility overestimation.
To identify current challenges and actual progress in achieving reliable charge carrier mobility in OTFTs.
To provide guidelines for developing next-generation organic semiconductors with enhanced mobility.

Main Methods:

Comprehensive literature review of published OTFT data over the past 30 years.
Analysis of current-voltage characteristics to identify and account for nonlinearities.
Synthesis of findings to summarize successful strategies for high-performance organic semiconductors.

Main Results:

Widespread overestimation of field-effect mobility in OTFTs is confirmed.
Reliable hole and electron mobility values of 20 and 10 cm² V^-1 s^-1 , respectively, remain unachieved.
Key design principles for high-performance p-type polymers and strategies for n-type polymers and small molecules are summarized.

Conclusions:

Accurate analysis of OTFT data is crucial for reliable progress assessment.
Further research is needed to overcome current limitations and achieve target mobility values.
Understanding the factors contributing to high mobility in small molecule/polymer blends can guide future material design.