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Field-effect bulk mobilities in polymer semiconductor films measured by sourcemeters
Zongze Qin1,2, Songyu Han1,2, Dongfan Li1,2
1Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an 710054, People's Republic of China.
The Review of Scientific Instruments
|October 20, 2023
Summary
We developed a field-effect transistor method to measure charge-density-dependent bulk mobility in semiconducting polymers. This technique accurately characterizes mobility across various charge densities, crucial for understanding polymer electronic properties.
Area of Science:
- Materials Science
- Organic Electronics
- Polymer Physics
Background:
- Semiconducting polymers possess inherent structural and morphological polydispersity.
- This leads to a wide distribution of localized electronic states and energy levels.
- Consequently, bulk charge mobility is highly dependent on free charge density.
Purpose of the Study:
- To propose a novel method for measuring charge-density-dependent bulk mobility in conjugated polymer films.
- To address the challenge of widely spread localized states in semiconducting polymers.
- To enable simultaneous extraction of bulk and interface mobility dependent on charge density.
Main Methods:
- Utilizing a conventional field-effect transistor (FET) configuration.
- Applying varying gate voltages to induce changes in bulk charge density.
- Analyzing transistor characteristics across a range of gate voltages.
Main Results:
- Successfully measured charge-density-dependent bulk mobility in conjugated polymer films.
- Demonstrated that gate-induced charge density variation is influenced by the energetic dispersion width of localized states.
- Simultaneously extracted field-effect bulk mobility and interface mobility as a function of charge density.
Conclusions:
- The proposed FET method effectively quantifies bulk charge mobility in polymers with broad localized state distributions.
- This technique provides insights into the relationship between charge density, mobility, and polymer morphology.
- Accurate characterization of mobility is vital for advancing organic electronic device performance.
