Morphology dependent electron transport in an n-type electron accepting small molecule for solar cell applications

作者：Krueger Karsten B; Schwenn Paul E; Gui Ke; Pivrikas Almantas; Meredith Paul^*; Burn Paul L

来源：Applied Physics Letters, 2011, 98(8): 083301.

DOI：10.1063/1.3556280

We report on the charge transport properties of a simple solution processable small-molecule electron acceptor, 2-[{7-(9,9-di-n-propyl-9H-fluoren-2-yl)benzo[c][1,2,5]thiadiazol-4-yl}methylene] malononitrile (K12), designed for use in bulk-heterojunction organic photovoltaic cells. It was found that the molecular order in as-cast films can be dramatically improved by annealing at moderate temperatures (60 degrees C), which leads to a greatly enhanced electron mobility. Using the photoinduced charge extraction in linearly increasing voltage technique we measured bulk electron mobilities to be as high as 10(-4) cm(2) V-1 s(-1), comparable with some of the best nonfullerene acceptor materials reported to date.

• 出版日期2011-2-21