Tuning the Properties of Polymer Bulk Heterojunction Solar Cells by Adjusting Fullerene Size to Control Intercalation
Nano Letters2009Vol. 9(12), pp. 4153–4157
Citations Over TimeTop 1% of 2009 papers
Nichole Cates, Roman Gysel, Zach M. Beiley, Chad E. Miller, Michael F. Toney, Martin Heeney, Iain McCulloch, Michael D. McGehee
Abstract
We demonstrate that intercalation of fullerene derivatives between the side chains of conjugated polymers can be controlled by adjusting the fullerene size and compare the properties of intercalated and nonintercalated poly(2,5-bis(3-hexadecylthiophen-2-yl)thieno[3,2-b]thiophene (pBTTT):fullerene blends. The intercalated blends, which exhibit optimal solar-cell performance at 1:4 polymer:fullerene by weight, have better photoluminescence quenching and lower absorption than the nonintercalated blends, which optimize at 1:1. Understanding how intercalation affects performance will enable more effective design of polymer:fullerene solar cells.
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