取代基的烷基-与烯基效应对方酸菁染料固态结构、载流子迁移率和体异质结太阳能电池效率的影响。

Marked alkyl- vs alkenyl-substitutent effects on squaraine dye solid-state structure, carrier mobility, and bulk-heterojunction solar cell efficiency.

机构信息

Department of Chemistry and the Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, Illinois 60208, USA.

出版信息

J Am Chem Soc. 2010 Mar 31;132(12):4074-5. doi: 10.1021/ja100520q.

DOI:10.1021/ja100520q

PMID:20205468

Abstract

We report two new squaraine dyes substituted at the pyrrolic rings with n-hexyl (squaraine 1) or n-hexenyl (squaraine 2) chains. Although internal molecular structure variations are minimal, the presence of the terminal double bond results in a much more compact solid-state structure, dramatically affecting charge transport in the thin films; the hole mobility of 2 is approximately 5x that of 1, and the BHJ OPV power conversion efficiency (PCE) of 2 is approximately 2x that of 1. PCEs surpassing 2% for ambient solution-processed devices are demonstrated, the largest so far achieved for squaraine-based organic solar cells.

摘要

我们报道了两种新型的吡咯环取代的方酸染料，分别用正己基（方酸 1）或正己烯基（方酸 2）链取代。尽管内部分子结构变化很小，但末端双键的存在导致了更紧凑的固态结构，这极大地影响了薄膜中的电荷输运；2 的空穴迁移率大约是 1 的 5 倍，2 的 BHJ OPV 光电转换效率（PCE）大约是 1 的 2 倍。证明了环境溶液处理器件的 PCE 超过 2%，这是迄今为止基于方酸的有机太阳能电池中最大的 PCE。