4.8 Article

The relationship between ionic-electronic coupling and transport in organic mixed conductors

期刊

SCIENCE ADVANCES
卷 9, 期 35, 页码 -

出版社

AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.adi3536

关键词

-

向作者/读者索取更多资源

In this study, in situ measurements of electrochemical (de)doping of an archetypal OMIEC were used to inform a quasi-field drift-diffusion model, accurately capturing experimentally measured ion transport. The research found that the chemical potential of holes represents a major driving force for mixed charge transport. Numerical simulations showed that the competition between hole drift and diffusion leads to diffuse space charge regions in spite of high charge densities, unique to mixed conducting systems.
Organic mixed ionic-electronic conductors (OMIECs) directly convert between ionic and electronic charge through electrochemical (de)doping, enabling a wide range of applications in bioelectronics, neuromorphic computing, and energy storage and conversion. While both ionic and electronic transport are individually well characterized, their combined transport has been difficult to describe self-consistently. We use in situ measurements of electrochemical (de)doping of an archetypal OMIEC to inform a quasi-field drift-diffusion model, which accurately captures experimentally measured ion transport across a range of potentials. We find that the chemical potential of holes, which is modulated by changes in doping level, represents a major driving force for mixed charge transport. Using numerical simulations at device-relevant time scales and potentials, we find that the competition between hole drift and diffusion leads to diffuse space charge regions despite high charge densities. This effect is unique to mixed conducting systems where mobile ionic charges can compensate the accumulation or depletion of electronic charge, thereby screening electrostatic driving forces.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.8
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据