Mechanisms of device degradation in organic solar cells: Influence of charge injection at the metal/organic contacts
Mechanisms of device degradation in organic solar cells: Influence of charge injection at the metal/organic contacts
复制标题
有机太阳能电池器件退化的机制：金属/有机接触处电荷注入的影响
DOI：
10.1016/j.orgel.2013.04.036
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发表时间：
2013-08
影响因子：
3.2
通讯作者：
C. Q. Wu
中科院分区：
文献类型：
--
作者：
W. C. Yang;Y. Yao;C. Q. Wu
有机太阳能电池在各种恶劣的环境条件下会发生器件退化，这在很大程度上限制了其效率和应用。频繁出现的S型电流密度-电压(J-V)特性正好反映了这种效应，并使其潜在的机制对实验者来说更加模糊。通过器件模型模拟，研究了有机体异质结太阳电池在不同界面电荷注入条件下的J-V曲线。我们发现，当电子和空穴注入势垒都超过0.3 eV时，出现了S形的扭结，这归因于暗注入载流子的短缺。对于近欧姆接触，开路电压显著降低。定量研究表明，这是由于接触附近的大部分载流子积累和引起的局域场变化引起的。随着载流子迁移率的增加，S形状的扭结逐渐消除。最后，我们发现在光吸收增强的情况下，填充因子减小，这是由于剧烈的双分子复合而导致的，从而意味着显著的内耗。
Organic solar cells suffer from device degradation under various undesirable ambient conditions, which limits their efficiencies and applications a lot. The frequently appeared S-shaped current density–voltage (J–V) characteristics just reflect this effect and make its underlying mechanisms even obscurer for experimentalists. By performing device model simulation, we investigate the J–V curves of a organic bulk heterojunction solar cell for different interfacial charge injection conditions. We find the S-shaped kinks appear when both electron and hole injection barriers exceed 0.3eV, which is attributed to the shortage of dark injection carriers. For the nearly Ohmic contacts, the open circuit voltage is significantly reduced. The quantitative study suggests it arising from the majority carrier accumulation and the induced local field variation at the vicinity of the contacts. S-shaped kink is gradually eliminated with increasing carrier mobilities. Finally, we find the decreasing of fill factor under enhanced light absorption, which results from the drastic bimolecular recombination and thus signifies remarkable internal losses.
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影响因子：
3.2
作者：
Kumar, Ankit;Sista, Srinivas;Yang, Yang
通讯作者：
Yang, Yang
影响因子：
3.7
作者：
S. Schäfer;A. Petersen;T. Wagner;R. Kniprath;D. Lingenfelser;Achmad Zen;T. Kirchartz;B. Zimmermann-B.-Z
通讯作者：
S. Schäfer;A. Petersen;T. Wagner;R. Kniprath;D. Lingenfelser;Achmad Zen;T. Kirchartz;B. Zimmermann-B.-Z
影响因子：
3.7
作者：
Barker, JA;Ramsdale, CM;Greenham, NC
通讯作者：
Greenham, NC
影响因子：
29.4
作者：
Deibel, Carsten;Strobel, Thomas;Dyakonov, Vladimir
通讯作者：
Dyakonov, Vladimir
影响因子：
3.1
作者：
SCHARFETTER, DL;GUMMEL, HK
通讯作者：
GUMMEL, HK