New insights into the design of conjugated polymers for intramolecular singlet fission.
New insights into the design of conjugated polymers for intramolecular singlet fission.
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对分子内单线态裂变共轭聚合物设计的新见解
DOI:
10.1038/s41467-018-05389-w
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发表时间:
2018-07-31
影响因子:
16.6
通讯作者:
Sfeir MY
中科院分区:
文献类型:
--
作者:
Hu J;Xu K;Shen L;Wu Q;He G;Wang JY;Pei J;Xia J;Sfeir MY
Singlet fission (SF), a multiple exciton generation process that generates two triplet excitons after the absorption of one photon, can potentially enable more efficient solar cell designs by harvesting energy normally lost as heat. While low-bandgap conjugated polymers are highly promising candidates for efficient SF-based solar cells, few polymer materials capable of SF have been reported because the SF process in polymer chains is poorly understood. Using transient spectroscopy, we demonstrate a new, highly efficient (triplet yield of 160–200%) isoindigo-based donor–acceptor polymer and show that the triplet pairs are directly emissive and exhibit a time-dependent energy evolution. Importantly, aggregation in poor solvents and in films significantly lowers the singlet energy, suppressing triplet formation because the energy conservation criterion is no longer met. These results suggest a new design rule for developing intramolecular SF capable low-bandgap conjugated polymers, whereby inter-chain interactions must be carefully engineered. Further mechanistic insight of intramolecular singlet fission (iSF) in conjugated polymers can enable novel material design for solar cells. Here, the authors use transient spectroscopy to show iSF in an isoindigo-based conjugated polymer and propose a design rule based on morphology-dependent iSF.
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影响因子:
16.6
作者:
Basel BS;Zirzlmeier J;Hetzer C;Phelan BT;Krzyaniak MD;Reddy SR;Coto PB;Horwitz NE;Young RM;White FJ;Hampel F;Clark T;Thoss M;Tykwinski RR;Wasielewski MR;Guldi DM
通讯作者:
Guldi DM
影响因子:
15
作者:
Musser, Andrew J.;Al-Hashimi, Mohammed;Clark, Jenny
通讯作者:
Clark, Jenny
影响因子:
15
作者:
Johnson, Justin C.;Nozik, Arthur J.;Michl, Josef
通讯作者:
Michl, Josef
影响因子:
15
作者:
Cui, Yong;Yao, Huifeng;Hou, Jianhui
通讯作者:
Hou, Jianhui
影响因子:
15
作者:
Sanders, Samuel N.;Kumarasamy, Elango;Sfeir, Matthew Y.
通讯作者:
Sfeir, Matthew Y.