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Influence of Molecular Weight on the Organic Electrochemical Transistor Performance of Ladder-Type Conjugated Polymers.
- Source :
-
Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2022 Jan; Vol. 34 (4), pp. e2106235. Date of Electronic Publication: 2021 Dec 08. - Publication Year :
- 2022
-
Abstract
- Organic electrochemical transistors (OECTs) hold promise for developing a variety of high-performance (bio-)electronic devices/circuits. While OECTs based on p-type semiconductors have achieved tremendous progress in recent years, n-type OECTs still suffer from low performance, hampering the development of power-efficient electronics. Here, it is demonstrated that fine-tuning the molecular weight of the rigid, ladder-type n-type polymer poly(benzimidazobenzophenanthroline) (BBL) by only one order of magnitude (from 4.9 to 51 kDa) enables the development of n-type OECTs with record-high geometry-normalized transconductance (g <subscript>m,norm</subscript>  ≈ 11 S cm <superscript>-1</superscript> ) and electron mobility × volumetric capacitance (µC* ≈ 26 F cm <superscript>-1</superscript>  V <superscript>-1</superscript> s <superscript>-1</superscript> ), fast temporal response (0.38 ms), and low threshold voltage (0.15 V). This enhancement in OECT performance is ascribed to a more efficient intermolecular charge transport in high-molecular-weight BBL than in the low-molecular-weight counterpart. OECT-based complementary inverters are also demonstrated with record-high voltage gains of up to 100 V V <superscript>-1</superscript> and ultralow power consumption down to 0.32 nW, depending on the supply voltage. These devices are among the best sub-1 V complementary inverters reported to date. These findings demonstrate the importance of molecular weight in optimizing the OECT performance of rigid organic mixed ionic-electronic conductors and open for a new generation of power-efficient organic (bio-)electronic devices.<br /> (© 2021 The Authors. Advanced Materials published by Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-4095
- Volume :
- 34
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Advanced materials (Deerfield Beach, Fla.)
- Publication Type :
- Academic Journal
- Accession number :
- 34658088
- Full Text :
- https://doi.org/10.1002/adma.202106235