Singlet Exciton Fission for Solar Cell Applications: Energy Aspects of Interchromophore Coupling

详细信息    查看全文

• 作者：Eric C. Greyson ; Brian R. Stepp ; Xudong Chen ; Andrew F. Schwerin ; Irina Paci ; Millicent B. Smith ; Akin Akdag ; Justin C. Johnson ; Arthur J. Nozik ; Josef Michl ; Mark A. Ratner
• 刊名：Journal of Physical Chemistry B
• 出版年：2010
• 出版时间：November 18, 2010
• 年：2010
• 卷：114
• 期：45
• 页码：14223-14232
• 全文大小：378K
• 年卷期：v.114,no.45(November 18, 2010)
• ISSN：1520-5207

文摘

Singlet exciton fission, a process that converts one singlet exciton to a pair of triplet excitons, has the potential to enhance the efficiency of both bulk heterojunction and dye-sensitized solar cells and is understood in crystals but not well understood in molecules. Previous studies have identified promising building blocks for singlet fission in molecular systems, but little work has investigated how these individual chromophores should be combined to maximize triplet yield. We consider the effects of chemically connecting two chromophores to create a coupled chromophore pair and compute how various structural choices alter the thermodynamic and kinetic parameters likely to control singlet fission yield. We use density functional theory to compute the electron transfer matrix element and the thermodynamics of fission for several promising chromophore pairs and find a trade-off between the desire to maximize this element and the desire to keep the singlet fission process exoergic. We identify promising molecular systems for singlet fission and suggest future experiments.