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首页> 外文期刊>Organic Electronics >Electronic structures of planar and mixed C70/CuPc heterojunctions in organic photovoltaic devices
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Electronic structures of planar and mixed C70/CuPc heterojunctions in organic photovoltaic devices

机译：有机光伏器件中平面和混合C70 / CuPc异质结的电子结构

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摘要

Understanding the electronic structures of organic donor-acceptor heterojunction is of pronounced importance for the optimization of organic photovoltaic cells. Here, the detailed electronic structures of a planar fullerene (C70)/copper phthalocyanine (CuPc) bilayer and a mixed C70:CuPc bulk heterojunction (BHJ) have been studied via in situ pho-toemission spectroscopy. The results show that the energy level alignment by lining up separately observed energy levels of individual organic materials is not valid for these organic heterojunctions. The energy offset between the highest occupied molecular orbital of donor-like CuPc and the lowest unoccupied molecular orbital of acceptor-like C70, which is regarded as the origin of open-circuit voltage (UOc). is found to increase from 0.55 eV in the bilayer structure to 0.8 eV in the BHJ, which is possibly associated with the polarizabil-ity changes of C70 and CuPc molecules in the BHJs. This change is confirmed by the VOc variation in devices, where the VOc dramatically increased from 0.35 to 0.46 V by replacing the C70/CuPc bilayer with C70:CuPc BHJ. The thermal annealing effect on the mixed C70:CuPc BHJ reveals vertical phase separation, resulting in inhomogeneous concentration distribution in profile.
机译：理解有机供体-受体异质结的电子结构对于优化有机光伏电池具有重要意义。在这里，已经通过原位光发射光谱研究了平面富勒烯（C70）/铜酞菁（CuPc）双层和混合的C70：CuPc本体异质结（BHJ）的详细电子结构。结果表明，通过排列单独观察到的单个有机材料的能级进行的能级对准对于这些有机异质结是无效的。供体样CuPc的最高占据分子轨道与受体样C70的最低未占据分子轨道之间的能量偏移被视为开路电压（UOc）的起源。据发现，BHJs从双层结构中的0.55 eV增加到BHJ中的0.8 eV，这可能与BHJs中C70和CuPc分子的极化率变化有关。器件中的VOc变化证实了这一变化，其中VOc通过用C70：CuPc BHJ代替C70 / CuPc双层而从0.35 V急剧增加到0.46V。对混合的C70：CuPc BHJ的热退火效应显示出垂直相分离，从而导致轮廓中浓度分布不均匀。

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  • 来源
    《Organic Electronics》 |2011年第8期|p.1422-1428|共7页
  • 作者

    H.X. Wei; J. Li; Y. Cai; Z.Q. Xu; S.T. Lee; Y.Q. Li; J.X. Tang;

  • 作者单位

    Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University,Suzhou 215123, China;

    Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University,Suzhou 215123, China;

    Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University,Suzhou 215123, China;

    Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University,Suzhou 215123, China;

    Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, China;

    Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University,Suzhou 215123, China;

    Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University,Suzhou 215123, China;

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  • 正文语种 eng
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  • 关键词

    opv; c70; cupc; bulk heterojunction; planar heterostructure; electronic structure;

    机译：opv;c70;cupc;本体异质结;平面异质结构;电子结构;

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