Identification of a triplet pair intermediate in singlet exciton fission in solution
Identification of a triplet pair intermediate in singlet exciton fission in solution
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DOI：
10.1073/pnas.1503471112
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发表时间：
2015-06-23
影响因子：
11.1
通讯作者：
Walker, Brian J.
中科院分区：
文献类型：
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作者：
Stern, Hannah L.;Musser, Andrew J.;Walker, Brian J.
单线态激子裂变是一个自旋单线态激子自旋守恒转变为两个自旋三线态激子。这种激子倍增机制为绕过单结肖克利-奎瑟极限的太阳能电池提供了一条有吸引力的途径。大多数单线态裂变的理论描述都会引用一对自旋三线态激子耦合成整体自旋单线态构型的中间态，但这种状态从未被光学观察到。在解决方案中，我们表明裂变动力学受到扩散限制，并且能够分离中间物质。在双（三异丙基甲硅烷基乙炔基）[TIPS]并四苯的浓缩溶液中，我们发现快速（
Singlet exciton fission is the spin-conserving transformation of one spin-singlet exciton into two spin-triplet excitons. This exciton multiplication mechanism offers an attractive route to solar cells that circumvent the single-junction Shockley-Queisser limit. Most theoretical descriptions of singlet fission invoke an intermediate state of a pair of spin-triplet excitons coupled into an overall spin-singlet configuration, but such a state has never been optically observed. In solution, we show that the dynamics of fission are diffusion limited and enable the isolation of an intermediate species. In concentrated solutions of bis(triisopropylsilylethynyl)[TIPS]tetracene we find rapid (