Electroreflectance imaging of gold–H3PO4 supercapacitors. Part I: experimental methodology. Issue 4 (28th January 2016)

• Record Type: Journal Article
• Authors: Maize, Kerry; Kundu, Arpan; Xiong, Guoping; Saviers, Kimberly; Fisher, Timothy S.; Shakouri, Ali
• Is Part Of: Analyst. Volume 141:Issue 4(2016)
• Page Start: 1448
• Page End: 1461
• Publication Date: 2016-01-28
• Subjects: Chemistry, Analytic -- Periodicals; 543
• DOI: 10.1039/c5an01972a
• Languages: English
• ISSNs: 0003-2654

Abstract

Abstract : Electroreflectance microscopy is demonstrated as a high-resolution, non-contact method to image dynamic charge distribution in integrated microsupercapacitor structures during fast voltage cycling. Abstract : Electroreflectance microscopy is demonstrated as a high-resolution, non-contact method to image dynamic charge distribution in integrated microsupercapacitor structures during fast voltage cycling. Electroreflectance camera images of a gold electrode H3 PO4 polymer electrolyte microsupercapacitor reveal time varying charge distribution with submicron spatial resolution, millisecond time resolution, and electroreflectance resolution on the order of 500 nC cm −2 . A model describing changes in the metal electrode's optical constants as a function of free electron concentration shows good agreement with measured electroreflectance. The proposed method can be used for sensitive, non-contact measurements of charge spatial distribution, and defect and performance characterization in electrode–electrolyte microdevices.