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首页> 外文期刊>Advanced Functional Materials >Charge Density Dependent Nongeminate Recombination in Organic Bulk Heterojunction Solar Cells
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Charge Density Dependent Nongeminate Recombination in Organic Bulk Heterojunction Solar Cells

机译：有机体异质结太阳能电池中电荷密度依赖的非对接重组。

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Apparent recombination orders exceeding the value of two expected for bimolecular recombination have been reported for organic solar cells in various publications. Two prominent explanations are bimolecular losses with a carrier concentration dependent prefactor due to a trapping limited mobility and protection of trapped charge carriers from recombination by a donor-acceptor phase separation until re-emission from these deep states. In order to clarify which mechanism is dominant temperature- and illumination-dependent charge extraction measurements are performed under open circuit and short circuit conditions at poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C_(61) butyric acid methyl ester (P3HT:PC_(61)BM) and PTB7:PC_(71)BM (poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethyl-hexyl)carbonyl]thieno[3,4-b]thiophenediyl]]) solar cells in combination with current-voltage characteristics. It is shown that the charge carrier density n dependence of the mobility μ and the recombination prefactor are different for P3HT:PC_(61)BM at temperatures below 300 K and PTB7:PC_(71)BM at room temperature. Therefore, in addition to μ(n), a detrapping limited recombination in systems with at least partial donor-acceptor phase separation is required to explain the high recombination orders.
机译：在各种出版物中已经报道了有机太阳能电池的表观重组顺序超过了预期的双分子重组的两个值。两种突出的解释是由于分子俘获的受限迁移率而导致的双分子损失，其具有依赖于载流子浓度的因数，并且保护了被俘获的电荷载子免受施主-受主相分离的重组直至从这些深态重新发射。为了阐明哪种机理是主要的温度和照明依赖性电荷提取测量，在开环和短路条件下，对聚（3-己基噻吩-2,5-二基）：[6,6]-苯基-C_（ 61）丁酸甲酯（P3HT：PC_（61）BM）和PTB7：PC_（71）BM（聚[[[4,8-双[（2-乙基己基）氧基]苯并[1,2-b：4， 5-b']二噻吩-2,6-二基] [3-氟-2-[（2-乙基-己基）羰基]噻吩并[3,4-b]噻吩二基]]）太阳能电池与电流-电压的组合特征。结果表明，对于低于300 K的温度下的P3HT：PC_（61）BM和在室温下的PTB7：PC_（71）BM，迁移率μ的电荷载流子密度n依赖性和重组前置因子不同。因此，除了μ（n），还需要在具有至少部分供体-受体相分离的系统中进行有限俘获的重组，以解释高重组顺序。

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  • 来源
    《Advanced Functional Materials》 |2012年第16期|p.3371-3377|共7页
  • 作者

    Daniel Rauh; Carsten Deibel; Vladimir Dyakonov;

  • 作者单位

    Bavarian Center for Applied Energy Research e.V. (ZAE Bayern) Am Hubland, 97074 Wuerzburg, Germany;

    Experimental Physics VI Faculty of Physics and Astronomy Julius-Maximilian-University of Wuerzburg Am Hubland, 97074 Wuerzburg, Germany;

    Bavarian Center for Applied Energy Research e.V. (ZAE Bayern) Am Hubland, 97074 Wuerzburg, Germany,Experimental Physics VI Faculty of Physics and Astronomy Julius-Maximilian-University of Wuerzburg Am Hubland, 97074 Wuerzburg, Germany;

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