Singlet Fission in 9,10-Bis(phenylethynyl)anthracene Thin Films
Singlet Fission in 9,10-Bis(phenylethynyl)anthracene Thin Films
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DOI：
10.1021/jacs.8b07498
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发表时间：
2018-11-14
影响因子：
15
通讯作者：
Wasielewski, Michael R.
中科院分区：
文献类型：
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作者：
Bae, Youn Jue;Kang, Gyeongwon;Wasielewski, Michael R.
单线态裂变（SF）在两个或多个电子耦合的有机发色团中将高能单线态激子转化为两个低能的三重态激子，可用于提高太阳能电池的效率。由于化学不稳定性和低三重态能量，许多已知的SF发色团不适合用于器件应用。本文的结果表明，高效的SF发生在9,10-双（苯乙基）蒽（BPEA）的多晶薄膜中，BPEA是一种商业染料，在固态下的单线态和三重态能量分别为2.40和1.11 eV。BPEA结晶成具有C2/c和Pbcn空间群的两个多晶，分别经历k(SFA) = (109 +/- 4 ps)（-1）和k(SFB) = (490 +/- 10 ps)（-1）的SF。从180 +/- 20%的三重态产率可以看出，BPEA具有高的三重态能量和高效的SF，这使得BPEA成为提高太阳能电池性能的有希望的候选者。
Singlet fission (SF) in two or more electronically coupled organic chromophores converts a high-energy singlet exciton into two low-energy triplet excitons, which can be used to increase solar cell efficiency. Many known SF chromophores are unsuitable for device applications due to chemical instability and low triplet state energies. The results described here show that efficient SF occurs in polycrystalline thin films of 9,10-bis(phenylethynyl)anthracene (BPEA), a commercial dye that has singlet and triplet energies of 2.40 and 1.11 eV, respectively, in the solid state. BPEA crystallizes into two polymorphs with space groups C2/c and Pbcn, which undergo SF with k(SFA) = (109 +/- 4 ps)(-1) and k(SFB) = (490 +/- 10 ps)(-1), respectively. The high triplet energy and efficient SF evidenced from the 180 +/- 20% triplet yield make BPEA a promising candidate for enhancing solar cell performance.