Influence of Molecular Weight on the Organic Electrochemical Transistor Performance of Ladder-Type Conjugated Polymers

Han Yan Wu, Chi Yuan Yang, Qifan Li, Nagesh B. Kolhe, Xenofon Strakosas, Marc Antoine Stoeckel, Ziang Wu, Wenlong Jin, Marios Savvakis, Renee Kroon, Deyu Tu, Han Young Woo, Magnus Berggren, Samson A. Jenekhe, Simone Fabiano

Research output: Contribution to journalArticlepeer-review

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 (gm,norm ≈ 11 S cm−1) and electron mobility × volumetric capacitance (µC* ≈ 26 F cm−1 V−1 s−1), 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−1 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.

Original languageEnglish
JournalAdvanced Materials
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • complementary circuits
  • inverters
  • molecular weight
  • n-type polymers
  • organic electrochemical transistors
  • organic mixed ionic–electronic conductors

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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