Tailor-Made Additives for Morphology Control in Molecular Bulk-Heterojunction Photovoltaics

Kenneth R. Graham, Romain Stalder, Patrick M. Wieruszewski, Dinesh G. Patel, Danielle H. Salazar, John R. Reynolds

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Tailor-made additives, which are molecules that share the same molecular structure as a parent molecule with only slight structural variations, have previously been demonstrated as a useful means to control crystallization dynamics in solution. For example, tailor-made additives can be added to solutions of a crystallizing parent molecule to alter the crystal growth rate, size, and shape. We apply this strategy as a means to predictably control morphology in molecular bulk-heterojunction (BHJ) photovoltaic cells. Through the use of an asymmetric oligomer substituted with a bulky triisobutylsilyl end group, the morphology of BHJ blends can be controlled resulting in a near doubling (from 1.3 to 2.2%) in power conversion efficiency. The use of tailor-made additives provides promising opportunities for controlling crystallization dynamics, and thereby film morphologies, for many organic electronic devices such as photovoltaics and field-effect transistors. © 2012 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)63-71
Number of pages9
JournalACS Applied Materials & Interfaces
Volume5
Issue number1
DOIs
StatePublished - Dec 24 2012
Externally publishedYes

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