ACS Appl Mater Interfaces. 2013 Nov 27;5(22):11509-14. doi: 10.1021/am403805j. Epub 2013 Nov 11.

Characterizing ion profiles in dynamic junction light-emitting electrochemical cells.

ACS applied materials & interfaces

Tyko D Shoji, Zihua Zhu, Janelle M Leger

PMID: 24175736 DOI: 10.1021/am403805j

Abstract

Organic semiconductors have the unique ability to conduct both ionic and electronic charge carriers in thin films, an emerging advantage in applications such as light-emitting devices, transistors, and electrochromic devices, among others. Evidence suggests that the profiles of ions and electrochemical doping in the polymer film during operation significantly impact the performance and stability of the device. However, few studies have directly characterized ion profiles within LECs. Here, we present an in-depth study of the profiles of ion distributions in LECs following application of voltage, via time-of-flight secondary ion mass spectrometry. Ion distributions were characterized with regard to film thickness, salt concentration, applied voltage, and relaxation over time. Results provide insight into the correlation between ion profiles and device performance, as well as potential approaches to tuning the electrochemical doping processes in LECs.

Publication Types

• Journal Article
• Research Support, Non-U.S. Gov't
• Research Support, U.S. Gov't, Non-P.H.S.