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Title: Charge Carrier Induced Structural Ordering And Disordering in Organic Mixed Ionic Electronic Conductors

Abstract

Operational stability underpins the successful application of organic mixed ionic-electronic conductors (OMIECs) in a wide range of fields, including biosensing, neuromorphic computing, and wearable electronics. Here in this work, both the operation and stability of a p-type OMIEC material of various molecular weights are investigated. Electrochemical transistor measurements reveal that device operation is very stable for at least 300 charging/discharging cycles independent of molecular weight, provided the charge density is kept below the threshold where strong charge–charge interactions become likely. When electrochemically charged to higher charge densities, an increase in device hysteresis and a decrease in conductivity due to a drop in the hole mobility arising from long-range microstructural disruptions are observed. By employing operando X-ray scattering techniques, two regimes of polaron-induced structural changes are found: 1) polaron-induced structural ordering at low carrier densities, and 2) irreversible structural disordering that disrupts charge transport at high carrier densities, where charge–charge interactions are significant. These operando measurements also reveal that the transfer curve hysteresis at high carrier densities is accompanied by an analogous structural hysteresis, providing a microstructural basis for such instabilities. This work provides a mechanistic understanding of the structural dynamics and material instabilities of OMIEC materials during device operation.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [1];  [3];  [2];  [2];  [4]; ORCiD logo [1]
  1. Stanford University, CA (United States)
  2. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  3. University of Oxford (United Kingdom)
  4. Stanford University, CA (United States); Chalmers University of Technology, Gothenburg (Sweden)
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS); National Science Foundation (NSF); EU Horizon2020
OSTI Identifier:
2323316
Grant/Contract Number:  
AC02-76SF00515; SC0014664; SC0023411; DGE-1656518; ECCS-2026822; DMR-1808401; 1739795; 952911; 862474; 101007084
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Materials
Additional Journal Information:
Journal Name: Advanced Materials; Journal ID: ISSN 0935-9648
Publisher:
Wiley
Country of Publication:
United States
Language:
English

Citation Formats

Quill, Tyler J., LeCroy, Garrett, Marks, Adam, Hesse, Sarah A., Thiburce, Quentin, McCulloch, Iain, Tassone, Christopher J., Takacs, Christopher J., Giovannitti, Alexander, and Salleo, Alberto. Charge Carrier Induced Structural Ordering And Disordering in Organic Mixed Ionic Electronic Conductors. United States: N. p., 2024. Web. doi:10.1002/adma.202310157.
Quill, Tyler J., LeCroy, Garrett, Marks, Adam, Hesse, Sarah A., Thiburce, Quentin, McCulloch, Iain, Tassone, Christopher J., Takacs, Christopher J., Giovannitti, Alexander, & Salleo, Alberto. Charge Carrier Induced Structural Ordering And Disordering in Organic Mixed Ionic Electronic Conductors. United States. https://doi.org/10.1002/adma.202310157
Quill, Tyler J., LeCroy, Garrett, Marks, Adam, Hesse, Sarah A., Thiburce, Quentin, McCulloch, Iain, Tassone, Christopher J., Takacs, Christopher J., Giovannitti, Alexander, and Salleo, Alberto. Wed . "Charge Carrier Induced Structural Ordering And Disordering in Organic Mixed Ionic Electronic Conductors". United States. https://doi.org/10.1002/adma.202310157.
@article{osti_2323316,
title = {Charge Carrier Induced Structural Ordering And Disordering in Organic Mixed Ionic Electronic Conductors},
author = {Quill, Tyler J. and LeCroy, Garrett and Marks, Adam and Hesse, Sarah A. and Thiburce, Quentin and McCulloch, Iain and Tassone, Christopher J. and Takacs, Christopher J. and Giovannitti, Alexander and Salleo, Alberto},
abstractNote = {Operational stability underpins the successful application of organic mixed ionic-electronic conductors (OMIECs) in a wide range of fields, including biosensing, neuromorphic computing, and wearable electronics. Here in this work, both the operation and stability of a p-type OMIEC material of various molecular weights are investigated. Electrochemical transistor measurements reveal that device operation is very stable for at least 300 charging/discharging cycles independent of molecular weight, provided the charge density is kept below the threshold where strong charge–charge interactions become likely. When electrochemically charged to higher charge densities, an increase in device hysteresis and a decrease in conductivity due to a drop in the hole mobility arising from long-range microstructural disruptions are observed. By employing operando X-ray scattering techniques, two regimes of polaron-induced structural changes are found: 1) polaron-induced structural ordering at low carrier densities, and 2) irreversible structural disordering that disrupts charge transport at high carrier densities, where charge–charge interactions are significant. These operando measurements also reveal that the transfer curve hysteresis at high carrier densities is accompanied by an analogous structural hysteresis, providing a microstructural basis for such instabilities. This work provides a mechanistic understanding of the structural dynamics and material instabilities of OMIEC materials during device operation.},
doi = {10.1002/adma.202310157},
journal = {Advanced Materials},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 10 00:00:00 EST 2024},
month = {Wed Jan 10 00:00:00 EST 2024}
}

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