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Singlet and Triplet Excited-State Dynamics of a Nonfullerene Electron Acceptor Y6
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-09-16 , DOI: 10.1021/acs.jpcc.1c06448 Shin-ichiro Natsuda 1 , Yuji Sakamoto 1 , Taiki Takeyama 1 , Rei Shirouchi 1 , Toshiharu Saito 1 , Yasunari Tamai 1, 2 , Hideo Ohkita 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-09-16 , DOI: 10.1021/acs.jpcc.1c06448 Shin-ichiro Natsuda 1 , Yuji Sakamoto 1 , Taiki Takeyama 1 , Rei Shirouchi 1 , Toshiharu Saito 1 , Yasunari Tamai 1, 2 , Hideo Ohkita 1
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Understanding the excited-state dynamics of nonfullerene electron acceptors is essential for further improvement of organic solar cells as they are responsible for near-IR light absorption. Herein, we investigated the singlet and triplet excited-state dynamics in Y6, a novel nonfullerene acceptor, using transient absorption spectroscopy. We found that, even at low excitation fluences, pristine Y6 films show biphasic singlet exciton decay kinetics with decay constants of ∼220 ps and ∼1200 ps. The majority of the Y6 singlet excitons decayed with the faster (∼220 ps) component, whereas a clear photoluminescence with the slower (∼1200 ps) component was observed, which is the origin of the large discrepancies in the previously reported exciton lifetimes of Y6 in the solid state. At high excitation fluences, on the other hand, Y6 singlet excitons are more likely to decay via singlet–singlet exciton annihilation due to fast exciton diffusion in crystalline domains, after which we observed ultrafast triplet formation, assigned to singlet fission from higher excited singlet states.
中文翻译：
非富勒烯电子受体 Y6 的单重态和三重态激发态动力学
了解非富勒烯电子受体的激发态动力学对于进一步改进有机太阳能电池至关重要，因为它们负责近红外光吸收。在此，我们使用瞬态吸收光谱研究了 Y6（一种新型非富勒烯受体）的单线态和三线态激发态动力学。我们发现，即使在低激发通量下，原始 Y6 薄膜也显示出双相单线态激子衰变动力学，衰变常数为~220 ps 和~1200 ps。大多数 Y6 单线态激子以较快 (~220 ps) 的分量衰减，而观察到清晰的光致发光与较慢 (~1200 ps) 分量，这是先前报道的 Y6 激子寿命存在巨大差异的原因在固态。另一方面，在高激发通量下，
更新日期：2021-09-30
中文翻译：
非富勒烯电子受体 Y6 的单重态和三重态激发态动力学
了解非富勒烯电子受体的激发态动力学对于进一步改进有机太阳能电池至关重要，因为它们负责近红外光吸收。在此，我们使用瞬态吸收光谱研究了 Y6（一种新型非富勒烯受体）的单线态和三线态激发态动力学。我们发现，即使在低激发通量下，原始 Y6 薄膜也显示出双相单线态激子衰变动力学，衰变常数为~220 ps 和~1200 ps。大多数 Y6 单线态激子以较快 (~220 ps) 的分量衰减，而观察到清晰的光致发光与较慢 (~1200 ps) 分量，这是先前报道的 Y6 激子寿命存在巨大差异的原因在固态。另一方面，在高激发通量下，
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