Tailor-Made Additives for Morphology Control in Molecular Bulk-Heterojunction Photovoltaics
详细信息 查看全文
- 作者：Kenneth R. Graham ; Romain Stalder ; Patrick M. Wieruszewski ; Dinesh G.Patel ; Danielle H. Salazar ; John R. Reynolds
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2013
- 出版时间：January 9, 2013
- 年：2013
- 卷：5
- 期：1
- 页码：63-71
- 全文大小：576K
- 年卷期：v.5,no.1(January 9, 2013)
- ISSN：1944-8252
文摘
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.