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首页> 外文期刊>Advanced Functional Materials >Triplet Exciton and Polaron Dynamics in Phosphorescent Dye Blended Polymer Photovoltaic Devices
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Triplet Exciton and Polaron Dynamics in Phosphorescent Dye Blended Polymer Photovoltaic Devices

机译：磷光染料共混聚合物光伏器件中的三重态激子和极化子动力学

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摘要

The triplet exciton and polaron dynamics in phosphorescent dye (PtOEP) blended polymer (MEH-PPV) photovoltaic devices are investigated by quasi-steady-state photo-induced absorption (PIA) spectroscopy. According to the low-temperature PIA and photoluminescence (PL) results, the increase in strength of the triplet-triplet (T_1-T_n) absorption of MEH-PPV in the blend system originates from the triplet-triplet energy transfer from PtOEP to MEH-PPV. The PtOEP blended MEH-PPV/C_(60) bilayer photovoltaic device shows a roughly 30%-40% enhancement in photocurrent and power-conversion efficiency compared to the device without PtOEP. However, in contrast to the bilayer device results, the bulk heterojunction photovoltaic devices do not show a noticeable change in photocurrent and power-conversion efficiency in the presence of PtOEP. The PIA intensity, originating from the polaron state, is only slightly higher (within the experimental error), indicating that carrier generation in the bulk heterojunction is not enhanced in the presence of PtOEP. The rate and probability of the exciton dissociation between PtOEP and PCBM is much faster and higher than that of the triplet-triplet energy transfer between PtOEP and MEH-PPV.
机译：通过准稳态光致吸收（PIA）光谱研究了磷光染料（PtOEP）混合聚合物（MEH-PPV）光伏器件中的三重态激子和极化子动力学。根据低温PIA和光致发光（PL）结果，共混体系中MEH-PPV的三重态-三重态（T_1-T_n）吸收强度的增加源自三重态-三重态从PtOEP到MEH-的能量转移。 PPV。与没有PtOEP的器件相比，PtOEP混合的MEH-PPV / C_（60）双层光伏器件在光电流和功率转换效率方面提高了大约30％-40％。但是，与双层器件的结果相反，在存在PtOEP的情况下，体异质结光伏器件的光电流和功率转换效率没有明显变化。源自极化子态的PIA强度仅稍高（在实验误差范围内），表明在存在PtOEP的情况下，本体异质结中的载流子生成不会增强。 PtOEP和PCBM之间的激子解离的速率和概率比PtOEP和MEH-PPV之间的三重态-三重态三重态能量转移要快得多，而且也更高。

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  • 来源
    《Advanced Functional Materials》 |2010年第17期|P.2945-2950|共6页
  • 作者

    Chang-Lyoul Lee; In-Wook Hwang; Clare Chisu Byeon; Bok Hyeon Kim; Neil C. Greenhann;

  • 作者单位

    Advanced Photonics Research Institute Gwangju Institute of Science and Technology Gwangju 500-712 (Republic of Korea);

    rnAdvanced Photonics Research Institute Gwangju Institute of Science and Technology Gwangju 500-712 (Republic of Korea);

    rnSchool of Mechanical Engineering Kyungpook National University Daegu 702-701 (Republic of Korea);

    rnAdvanced Photonics Research Institute Gwangju Institute of Science and Technology Gwangju 500-712 (Republic of Korea);

    Cavendish Laboratory J. J. Thomson Avenue, Cambridge CB3 OHE (UK);

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