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New application of AIEgens realized in photodetectors: reduced work function of transparent electrodes and much improved performance
Materials Chemistry Frontiers ( IF 7 ) Pub Date : 2017-10-10 00:00:00 , DOI: 10.1039/c7qm00404d
Lei Feng 1, 2, 3, 4, 5 , Can Wang 6, 7, 8, 9 , Xianyu Deng 1, 2, 3, 4, 5 , Xincheng Miao 1, 2, 3, 4, 5 , Jiaqiang Wang 6, 7, 8, 9 , Yangyang Wang 1, 2, 3, 4, 5 , Zhen Li 6, 7, 8, 9
Affiliation  

Highly sensitive organic photodetectors were achieved by tuning the work function of transparent electrodes using two AIEgens with different ionic side chains. With the insertion of AIE molecules, their projected detectivity (D*) was enhanced by over one order of magnitude, which was accompanied by a fast response speed and a large linear dynamic range. The devices exhibited the ability to effectively detect weak light with intensity less than 10 pW cm−2, which is clearly superior to traditional silicon photodetectors. The AIE molecules developed a good energetic match to facilitate photocurrents, and the non-conjugated ionic impeding effect blocked the electrons from transferring to the interface under dark conditions and lower dark currents, which significantly contributed to the high detectivity of the devices. This study indicates that high performance organic devices could be achieved by jointly controlling conjugation associated aggregation and the quantity and state of ions on the electrode surface, thus providing a new application for AIEgens.

中文翻译:

AIEgens在光电探测器中的新应用:减少了透明电极的功函并大大提高了性能

通过使用具有不同离子侧链的两种AIEgen调节透明电极的功函数,可以实现高度灵敏的有机光电探测器。随着AIE分子的插入,其预测的探测灵敏度(D *)提高了一个数量级以上,同时还具有快速的响应速度和较大的线性动态范围。这些设备具有有效检测强度低于10 pW cm -2的弱光的能力显然优于传统的硅光电探测器。AIE分子形成了良好的能量匹配以促进光电流,并且非共轭离子阻隔效应阻止了电子在黑暗条件下和更低的暗电流下转移到界面,这极大地促进了器件的高检测能力。这项研究表明,通过共同控制共轭相关的聚集以及电极表面上离子的数量和状态,可以实现高性能的有机器件,从而为AIEgens提供了新的应用。
更新日期:2017-10-31
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