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首页> 外文期刊>Advanced energy materials >Densely Packed Random Quarterpolymers Containing Two Donor and Two Acceptor Units: Controlling Absorption Ability and Molecular Interaction to Enable Enhanced Polymer Photovoltaic Devices
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Densely Packed Random Quarterpolymers Containing Two Donor and Two Acceptor Units: Controlling Absorption Ability and Molecular Interaction to Enable Enhanced Polymer Photovoltaic Devices

机译：包含两个供体和两个受体单元的密集堆积的无规四元共聚物：控制吸收能力和分子相互作用以实现增强的聚合物光伏器件

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摘要

Dithienyldiketopyrrolopyrrole (DPP2T) and thieno[3,2-b]thiophene (TT) building blocks, enabling a large intermolecular overlap through pi-pi stacking, into an amorphous-like polymer composed of benzo(1,2-b: 4,5-b') dithiophene (BDT) and fluorinated thieno[3,4-b]thiophene (QTT), are introduced. Herein, through the variation of relative compositions of DPP2T-TT and BDT-QTT in the polymer backbone, the synthesis and characterization of a series of condensed random 2D-2A "quarterpolymers" with two reference alternating copolymers are reported. The best power conversion efficiency (PCE) of 9.45% is achieved for the optimum composition due to the synergistic effects such as improved photon absorption and reduced recombination loss, and optimized blend morphology via a change in the crystallinity and orientation of the blend films compared to the alternating copolymers. Moreover, by isolating higher molecular weight and narrower polydispersity fractions of the quarterpolymer via a marginal solvent-soaking technique, the PCE is further boosted to 10.30%, which is among the highest PCE reported to date for random polymer-based PSCs. Therefore, this simple 2D-2A strategy, reported for the first time, should be extended to numerous quaterpolymer systems, greatly accelerating random polymer systems toward further improving PSCs.
机译：二噻吩基二酮基吡咯并吡咯（DPP2T）和噻吩并[3,2-b]噻吩（TT）构件，通过π-π堆积可形成较大的分子间重叠，形成由苯并（1,2-b：4,5）组成的无定形聚合物引入-b′）二噻吩（BDT）和氟化噻吩并[3，4-b]噻吩（QTT）。在本文中，通过改变聚合物主链中DPP2T-TT和BDT-QTT的相对组成，报道了一系列缩合的2D-2A“四元共聚物”与两种参考交替共聚物的合成和表征。由于具有协同效应，例如改善了光子吸收和减少了重组损失，并通过改变了共混膜的结晶度和取向，优化了共混物的形态，从而获得了最佳组成的最佳功率转换效率（PCE）为9.45％。交替共聚物。此外，通过采用边际溶剂浸泡技术分离四元聚合物的较高分子量和较窄的多分散度分数，PCE进一步提高到10.30％，这是迄今为止报道的基于无规聚合物的PSC的最高PCE之一。因此，首次报道的这种简单的2D-2A策略应扩展到许多四元共聚物体系，极大地促进了无规聚合物体系的发展，从而进一步改善了PSC。

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  • 来源
    《Advanced energy materials》 |2017年第15期|1700349.1-1700349.10|共10页
  • 作者

    Kang So-Huei; Kumari Tanya; Lee Sang Myeon; Jeong Mingyu; Yang Changduk;

  • 作者单位

    UNIST, Low Dimens Carbon Mat Ctr, Perovtron Res Ctr, Dept Energy Engn,Sch Energy & Chem Engn, 50 UNIST Gil, Ulsan 44919, South Korea;

    UNIST, Low Dimens Carbon Mat Ctr, Perovtron Res Ctr, Dept Energy Engn,Sch Energy & Chem Engn, 50 UNIST Gil, Ulsan 44919, South Korea;

    UNIST, Low Dimens Carbon Mat Ctr, Perovtron Res Ctr, Dept Energy Engn,Sch Energy & Chem Engn, 50 UNIST Gil, Ulsan 44919, South Korea;

    UNIST, Low Dimens Carbon Mat Ctr, Perovtron Res Ctr, Dept Energy Engn,Sch Energy & Chem Engn, 50 UNIST Gil, Ulsan 44919, South Korea;

    UNIST, Low Dimens Carbon Mat Ctr, Perovtron Res Ctr, Dept Energy Engn,Sch Energy & Chem Engn, 50 UNIST Gil, Ulsan 44919, South Korea;

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