Study of Photoelectric Conversion in Benzotrithiophene-Based Conjugated Semiconducting Polymers
Study of Photoelectric Conversion in Benzotrithiophene-Based Conjugated Semiconducting Polymers
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DOI：
10.2494/photopolymer.28.605
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发表时间：
2015-05
影响因子：
0.8
通讯作者：
Eman Al-Naamani;Marina Ide;Anesh Gopal;A. Saeki;I. Osaka;S. Seki
中科院分区：
文献类型：
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作者：
Eman Al-Naamani;Marina Ide;Anesh Gopal;A. Saeki;I. Osaka;S. Seki
以噻二唑并吡啶（TP）、二氟苯并噻二唑（FT）和萘并双噻二唑（NTz）三种电子接受单元为受电子单元，合成了苯并三噻吩（BTT）。这些低能带隙聚合物具有较深的HOMO能级（-5.4 ~-5.6eV），这将导致体异质结有机光致发光材料（OPV）开路电压（VOC）的增加。其中一种BTT聚合物和亚甲基[60]富勒烯（PCBM）共混物显示出0.99 V的高VOC，这是由于深HOMO能级和低能量损失。与亚甲基[70]富勒烯共混的BTT-NTz聚合物获得了最佳的功率转换效率（PCE）为2.7%。我们通过原子力显微镜、二维X射线衍射和时间分辨微波电导率深入表征了新型聚合物的光电和形态特征。这项工作突出了BTT基聚合物增加PCE的潜力，因为还有进一步改进的空间。
Benzotrithiophene (BTT), where three thiophenes are fused to a central benzene, was polymerized with three kinds of electron accepting units, thiadiazolopyridine (TP), difluorobenzothiadiazole (FT), or naphthobisthiadiazole (NTz). These low bandgap polymers exhibited deep HOMO level (-5.4 ~ -5.6 eV) which can lead to increasing open circuit voltage (VOC) of bulk heterojunction organic photovoltaics (OPV). One of the BTT polymers and methano[60]fullerene (PCBM) blend showed a high VOC of 0.99 V, owing to the deep HOMO level and low energy loss. The best power conversion efficiency (PCE) of 2.7% was obtained for the BTT-NTz polymer blended with methano[70]fullerene. We have intensively characterized optoelectronic and morphological features of the new polymers by atomic force microscopy, 2-dimensional X-ray diffraction, and time-resolved microwave conductivity. This work highlights the potential of BTT-based polymers for an increase of PCE, because there are extra rooms for further improvement.