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首页> 外文期刊>Advanced energy materials >Liquid Crystallinity as a Self-Assembly Motif for High-Efficiency, Solution-Processed, Solid-State Singlet Fission Materials
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Liquid Crystallinity as a Self-Assembly Motif for High-Efficiency, Solution-Processed, Solid-State Singlet Fission Materials

机译：液晶性作为高效固溶态单线裂变材料的自组装母题

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摘要

Solution and solution-deposited thin films of the discotic liquid crystalline electron acceptor-donor-acceptor (A-D-A) p-type organic semiconductor FHBC(TDPP)(2), synthesized by coupling thienyl substituted diketopyrrolopyrrole (TDPP) onto a fluorenyl substituted hexa-peri-hexabenzocoronene (FHBC) core, are examined by ultrafast and nanosecond transient absorption spectroscopy, and time-resolved photoluminescence studies to examine their ability to support singlet fission (SF). Grazing incidence wide-angle X-ray (GIWAX) studies indicate that as-cast thin films of FHBC(TDPP)(2) are "amorphous," while hexagonal packed discotic liquid crystalline films evolve during thermal annealing. SF in as-cast thin films is observed with an approximate to 150% triplet generation yield. Thermally annealing the thin films improves SF yields up to 170%. The as-cast thin films show no long-range order, indicating a new class of SF material where the requirement for local order and strong near neighbor coupling has been removed. Generation of long-lived triplets (mu s) suggests that these materials may also be suitable for inclusion in organic solar cells to enhance performance.
机译：通过将噻吩基取代的二酮基吡咯并吡咯（TDPP）偶联至芴基取代的六环上而合成的盘状液晶电子受体-供体（ADA）p型有机半导体FHBC（TDPP）（2）的溶液和溶液沉积薄膜通过超快和纳秒瞬态吸收光谱法以及时间分辨的光致发光研究，对六六六苯并二氢呋喃（FHBC）核进行了研究，以研究其支持单线态裂变（SF）的能力。掠入射广角X射线（GIWAX）研究表明，FHBC（TDPP）（2）的铸态薄膜为“非晶态”，而六方堆积的盘状液晶薄膜在热退火过程中会演化。观察到铸态薄膜中的SF，三重态生成产率约为150％。对薄膜进行热退火可将SF产量提高170％。铸态薄膜没有显示出长程有序，这表明一类新的SF材料已消除了对局部有序和强近邻耦合的要求。长寿命三胞胎（μs）的产生表明这些材料也可能适合包含在有机太阳能电池中以增强性能。

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