Title

Controlling J-Aggregate Formation For Increased Short-Circuit Current And Power Conversion Efficiency With A Squaraine Donor

Keywords

aggregates; organic photovoltaic cells; squaraines

Abstract

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 J-aggregation likely increases hole mobility and, as a result, charge separation of the photogenerated excited state. Copyright © 2012 John Wiley & Sons, Ltd. Macroscopic control of solution conditions prior to spin-coating allows for effective nanoscale control of donor morphology. This morphology has been optimized to give efficiency and short-circuit gains in a bulk heterojunction solar cell. © 2014 John Wiley & Sons, Ltd.

Publication Date

1-1-2014

Publication Title

Progress in Photovoltaics: Research and Applications

Volume

22

Issue

4

Number of Pages

488-493

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1002/pip.2289

Socpus ID

84895923763 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84895923763

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