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Surface Polarization Doping in Diketopyrrolopyrrole-Based Conjugated Copolymers Using Cross-Linkable Terpolymer
Yina Moon1, Jong-Woon Ha2, Minho Yoon3
1Department of Graphic Arts Information Engineering, Pukyong National University, Busan 48513, Republic of Korea.
ACS Applied Materials & Interfaces
|November 4, 2021
Summary
Fluorinated polymer dielectrics enable efficient p-type doping in organic field-effect transistors (OFETs) by inducing surface polarization. This strategy enhances hole mobility and shifts device characteristics without structural changes.
Area of Science:
- Materials Science
- Organic Electronics
- Semiconductor Physics
Background:
- Doping is crucial for tuning semiconductor electrical properties in electronic devices.
- Organic field-effect transistors (OFETs) face challenges in doping due to dopant diffusion and low efficiency.
- Existing doping methods can cause structural perturbations in organic semiconductors.
Purpose of the Study:
- To investigate the use of fluorinated functional groups in polymer dielectrics for p-type doping in OFETs.
- To achieve efficient doping without structural perturbations in diketopyrrolopyrrole (DPP)-based donor-acceptor (D-A) type semiconducting copolymer films.
- To understand the surface polarization doping effect induced by fluorinated groups.
Main Methods:
- Synthesis of two terpolymers: poly(pentafluorostyrene-co-3-azidopropyl-methacrylate-co-propargyl-methacrylate) (5F-SAPMA) with fluorinated units and poly(phenyl-methacrylate-co-3-azidopropyl-methacrylate-co-propargyl-methacrylate) (PhAPMA) without.
- Cross-linking of terpolymer films via click reaction for enhanced stability.
- Electrical characterization of OFETs using the synthesized terpolymer dielectrics.
Main Results:
- Fluorinated 5F-SAPMA dielectrics induced surface polarization, generating additional hole charges.
- The fluorinated groups minimized tail state broadening near the highest occupied molecular orbital (HOMO) level.
- OFETs with 5F-SAPMA showed a transition from ambipolar to p-type dominant characteristics.
- Hole mobility significantly increased from 0.023 to 0.305 cm²/ (V·s).
Conclusions:
- Fluorinated functional groups in polymer dielectrics are an effective strategy for p-type doping in DPP-based D-A type OFETs.
- Surface polarization doping enhances charge carrier concentration and improves device performance.
- This method offers a route to stable and efficient doping in organic electronics without structural damage.
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