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A Universal, Highly Stable Dopant System for Organic Semiconductors Based on Lewis-Paired Dopant Complexes
Osnat Zapata-Arteaga1, Aleksandr Perevedentsev1,2, Michela Prete1,2
1Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain.
ACS Energy Letters
|July 18, 2024
Summary
New Lewis-paired complexes significantly enhance organic semiconductor doping for electronics and energy devices. This breakthrough improves electrical conductivity, thermal stability, and device performance, overcoming limitations of traditional dopants.
Area of Science:
- Materials Science
- Organic Electronics
- Chemical Engineering
Background:
- Chemical doping is crucial for organic semiconductor applications like thermoelectrics.
- Conventional dopants face limitations in electrical conductivity, thermal stability, and generality.
- Lewis-paired complexes offer a novel approach to overcome these doping challenges.
Purpose of the Study:
- To introduce Lewis-paired complexes as high-performance dopants for organic semiconductors.
- To investigate the doping capabilities of B(C6F5)3 (BCF) and F4TCNQ.
- To demonstrate improved properties in doped organic semiconductors.
Main Methods:
- Utilizing Lewis acid BCF and Lewis base F4TCNQ as a dopant complex.
- Doping a wide range of organic semiconductors (>20 investigated).
- Employing complex activation and microstructure control techniques.
Main Results:
- Achieved conductivities >300 S cm-1 (isotropic) and >900 S cm-1 (chain-oriented) for poly(3-hexylthiophene) (P3HT).
- Obtained a 10-50x larger thermoelectric power factor compared to neat dopants.
- Demonstrated a 3x higher thermal dedoping activation energy and >10x better operational stability for BCF:F4TCNQ-doped P3HT.
Conclusions:
- Lewis-paired complexes, specifically BCF:F4TCNQ, are effective high-performance dopants for organic semiconductors.
- This doping strategy significantly enhances electrical conductivity and thermoelectric performance.
- The new dopants offer superior thermal stability and operational longevity for organic electronic devices.
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