Controlling J‐aggregate formation for increased short‐circuit current and power conversion efficiency with a squaraine donor. (28th September 2012)

• Record Type: Journal Article
• Authors: Spencer, Susan; Hu, Harry; Li, Qimeng; Ahn, Hyo‐Yang; Qaddoura, Maher; Yao, Sheng; Ioannidis, Andronique; Belfield, Kevin; Collison, Christopher J.
• Is Part Of: Progress in photovoltaics. Volume 22:Number 4(2014)
• Page Start: 488
• Page End: 493
• Publication Date: 2012-09-28
• Subjects: Solar cells -- Periodicals; Photovoltaic cells -- Periodicals; Solar power plants -- Periodicals; 621.31245
• DOI: 10.1002/pip.2289
• Languages: English
• ISSNs: 1062-7995

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>A squaraine dye is tested for novel application in a near‐infrared‐active organic photovoltaic cell that is subsequently optimized to obtain a power conversion efficiency of 2.4 ± 0.3%. The optimization utilizes an Alq3 buffer layer and macroscopic structure control through the addition of co‐solvents in the spin‐casting process. Co‐solvent addition increases the amount of aggregates present as measured through linear absorption spectroscopy, and there is a concurrent increase in both efficiency and short‐circuit current. An interpretation of the greatly increased current density is presented that describes how increased <italic>J</italic>‐aggregation likely increases hole mobility and, as a result, charge separation of the photogenerated excited state. Copyright © 2012 John Wiley &amp; Sons, Ltd.</p> </abstract>