Improved Performance of ZnO/Polymer Hybrid Photovoltaic Devices by Combining Metal Oxide Doping and Interfacial Modification
Improved Performance of ZnO/Polymer Hybrid Photovoltaic Devices by Combining Metal Oxide Doping and Interfacial Modification
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DOI：
10.1021/jp506266f
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发表时间：
2014-08
影响因子：
3.7
通讯作者：
O. Pachoumi;A. Bakulin;A. Sadhanala;H. Sirringhaus;R. Friend;Y. Vaynzof
中科院分区：
文献类型：
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作者：
O. Pachoumi;A. Bakulin;A. Sadhanala;H. Sirringhaus;R. Friend;Y. Vaynzof
光诱导的电荷分离在混合有机-无机界面是知之甚少，具有挑战性的控制。我们研究了ZnO/聚（3-己基噻吩）（P3 HT）模型体系的电荷分离，并采用Sr掺杂ZnO和苯基-C61-丁酸（PCBA）自组装修饰来研究和提高电荷分离效率。我们发现，单独掺杂降低了电荷分离的效率，由于在氧化物表面的缺陷态的引入。然而，通过掺杂和分子修饰的组合，由于界面陷阱的钝化和改进的修饰剂覆盖，电荷分离效率显著增强。这表明了掺杂和表面改性的复杂的非累积效应，并表明，通过正确选择金属氧化物掺杂剂和有机改性剂，可以将表现不佳的混合界面变成有效的界面。
Photoinduced charge separation at hybrid organic–inorganic interfaces is poorly understood and challenging to control. We investigate charge separation at a model system of ZnO/poly(3-hexylthiophene) (P3HT) and employ Sr doping of ZnO and phenyl-C61-butyric acid (PCBA) self-assembled modification to study and enhance the charge separation efficiency. We find that doping alone lowers the efficiency of charge separation due to the introduction of defect states at the oxide surface. However, with the combination of doping and molecular modification, charge separation efficiency is significantly enhanced due to the passivation of interfacial traps and improved modifier coverage. This demonstrates a complex noncumulative effect of doping and surface modification and shows that with the correct choice of metal oxide dopant and organic modifier, a poorly performing hybrid interface can be turned into an efficient one.