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A New Polymer Electron Acceptor Based on Thiophene‐S,S‐dioxide Unit for Organic Photovoltaics
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2017-10-24 , DOI: 10.1002/marc.201700505 Bin Meng 1 , Junhui Miao 1, 2 , Jun Liu 1 , Lixiang Wang 1
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2017-10-24 , DOI: 10.1002/marc.201700505 Bin Meng 1 , Junhui Miao 1, 2 , Jun Liu 1 , Lixiang Wang 1
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For polymer solar cells (PSCs), efficient polymer electron acceptors are always based on strong electron‐withdrawing imide unit or boron–nitrogen coordinative bond (B←N). In this paper, a new polymer electron acceptor based on thiophene‐S,S‐dioxide (TDO) unit is reported. The polymer electron acceptor, PBDT‐TDO, consists of alternating TDO unit and 4,8‐bis(alkylthienyl)‐2‐yl]benzo[1,2‐b:4,5‐b′]dithiophene (BDT) unit. For comparison, a control polymer with alternating BDT unit and thiophene unit has also been synthesized. Replacing thiophene unit with TDO unit in the polymer backbone leads to large downshift of lowest unoccupied molecular orbital/highest occupied molecular orbital energy levels by 0.9 eV/0.4 eV, which is attributed to the dearomatization and electron deficiency of TDO unit. The replacement also leads to redshift of absorption spectra by ≈110 nm. PSC device with PBDT‐TDO as the electron acceptor shows photovoltaic response with the preliminary power conversion efficiency of 0.64%. This work suggests a new approach to design polymer electron acceptors using the TDO unit.
中文翻译：
基于噻吩-S，S-二氧化物单元的新型聚合物电子受体，用于有机光伏
对于聚合物太阳能电池（PSC），有效的聚合物电子受体始终基于强吸电子酰亚胺单元或硼-氮配位键（B←N）。本文报道了一种基于噻吩-S，S-二氧化物（TDO）单元的新型聚合物电子受体。聚合物电子受体PBDT-TDO由交替的TDO单元和4,8-双（烷基噻吩基）-2-基]苯并[1,2-b：4,5- b']二噻吩（BDT）单元。为了比较，还合成了具有交替的BDT单元和噻吩单元的对照聚合物。在聚合物主链中用TDO单元取代噻吩单元导致最低未占据分子轨道/最高占据分子轨道能级大幅下降0.9 eV / 0.4 eV，这归因于TDO单元的脱芳香化作用和电子缺乏。替换还导致吸收光谱红移约110 nm。以PBDT-TDO作为电子受体的PSC器件显示出光伏响应，初步功率转换效率为0.64％。这项工作提出了一种使用TDO单元设计聚合物电子受体的新方法。
更新日期：2017-10-24
中文翻译：
基于噻吩-S，S-二氧化物单元的新型聚合物电子受体，用于有机光伏
对于聚合物太阳能电池（PSC），有效的聚合物电子受体始终基于强吸电子酰亚胺单元或硼-氮配位键（B←N）。本文报道了一种基于噻吩-S，S-二氧化物（TDO）单元的新型聚合物电子受体。聚合物电子受体PBDT-TDO由交替的TDO单元和4,8-双（烷基噻吩基）-2-基]苯并[1,2-b：4,5- b']二噻吩（BDT）单元。为了比较，还合成了具有交替的BDT单元和噻吩单元的对照聚合物。在聚合物主链中用TDO单元取代噻吩单元导致最低未占据分子轨道/最高占据分子轨道能级大幅下降0.9 eV / 0.4 eV，这归因于TDO单元的脱芳香化作用和电子缺乏。替换还导致吸收光谱红移约110 nm。以PBDT-TDO作为电子受体的PSC器件显示出光伏响应，初步功率转换效率为0.64％。这项工作提出了一种使用TDO单元设计聚合物电子受体的新方法。
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