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Exciton Transport in Molecular Semiconductor Crystals for Spin-Optoelectronics Paradigm.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-09-24 , DOI: 10.1002/chem.202003447 Weigang Zhu 1, 2 , Yajing Sun 3 , Jie Liu 1, 2 , Shuming Bai 1, 2 , Zhicheng Zhang 3 , Qiang Shi 1 , Wenping Hu 1, 3 , Hongbing Fu 1
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-09-24 , DOI: 10.1002/chem.202003447 Weigang Zhu 1, 2 , Yajing Sun 3 , Jie Liu 1, 2 , Shuming Bai 1, 2 , Zhicheng Zhang 3 , Qiang Shi 1 , Wenping Hu 1, 3 , Hongbing Fu 1
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Organic semiconductors with long‐range exciton diffusion length are highly desirable for optoelectronics but currently remain rare. Here, the estimated diffusion length of singlet excitons (LD) in 2,6‐diphenyl anthracene (DPA) crystals grown by solvent evaporation was shown to be up to approximately 124 nm. These crystals showed a previously unseen parallelogram morphology with layer‐by‐layer edge‐on molecular stacking, isotropic optical waveguiding, radiation rate and non‐radiation rate constants of 0.15 and 0.26 ns−1 respectively, as well as good field‐effect transistor hole mobility and theoretically computed strong electronic couplings as high as 109 meV. Photoresponse experiments revealed that the photoconductivity of DPA crystals is surprisingly not related to the radiative pathway but associated with rapid exciton diffusion to the crystal surface for charge separation and carrier bimolecular recombination. Taken together, DPA was shown to be a promising semiconducting material for a new organic optoelectronics paradigm.
中文翻译：
自旋光电子学范式在分子半导体晶体中的激子传输。
具有长程激子扩散长度的有机半导体非常适合光电子学，但目前仍很少见。在这里，通过溶剂蒸发生长的2,6-二苯基蒽（DPA）晶体中的单重态激子（L D）的估计扩散长度显示高达约124 nm。这些晶体显示出以前看不见的平行四边形形态，具有逐层边缘分子堆叠，各向同性光波导，辐射速率和非辐射速率常数分别为0.15和0.26 ns -1以及良好的场效应晶体管空穴迁移率和理论上计算出的高达109 meV的强电子耦合。光响应实验表明，DPA晶体的光电导性出乎意料地与辐射途径无关，但与激子迅速扩散到晶体表面以进行电荷分离和载流子双分子重组有关。综上所述，DPA被证明是一种新的有机光电子范例的有前途的半导体材料。
更新日期：2020-09-24
中文翻译：
自旋光电子学范式在分子半导体晶体中的激子传输。
具有长程激子扩散长度的有机半导体非常适合光电子学，但目前仍很少见。在这里，通过溶剂蒸发生长的2,6-二苯基蒽（DPA）晶体中的单重态激子（L D）的估计扩散长度显示高达约124 nm。这些晶体显示出以前看不见的平行四边形形态，具有逐层边缘分子堆叠，各向同性光波导，辐射速率和非辐射速率常数分别为0.15和0.26 ns -1以及良好的场效应晶体管空穴迁移率和理论上计算出的高达109 meV的强电子耦合。光响应实验表明，DPA晶体的光电导性出乎意料地与辐射途径无关，但与激子迅速扩散到晶体表面以进行电荷分离和载流子双分子重组有关。综上所述，DPA被证明是一种新的有机光电子范例的有前途的半导体材料。
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