High sensitivity, fast response and low operating voltage organic photodetectors by incorporating a water/alcohol soluble conjugated polymer anode buffer layer
High sensitivity, fast response and low operating voltage organic photodetectors by incorporating a water/alcohol soluble conjugated polymer anode buffer layer
复制标题
采用水溶性/醇溶性共轭聚合物阳极缓冲层的高灵敏度、快速响应和低工作电压有机光电探测器
DOI：
10.1039/c6ra26750e
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发表时间：
2017
期刊：
影响因子：
3.9
通讯作者：
Teng Feng
中科院分区：
文献类型：
--
作者：
Wang Tiening;Hu Yufeng;Deng Zhenbo;Wang Yue;Lv Longfeng;Zhu Lijie;Lou Zhidong;Hou Yanbing;Teng Feng
低暗电流密度在决定有机光电探测器（OPD）的整体性能方面起着关键作用。然而，体异质结中的施主域和受主域都与两个电极接触，体异质结具有高激子解离效率。因此，难以避免从电极到有源层的不期望的电荷注入，导致大多数OPD中的高暗电流密度。在这项工作中，我们制作的OPD的基础上，传统的聚（3-己基噻吩）（P3 HT）/（苯基-C61-丁酸甲酯）（PC61 BM）的本体异质结。通过在阳极和活性层之间加入水/醇可溶性共轭聚合物（WSCP）聚[（9，9-双（3 '-（N，N-二甲基氨基）丙基）-2，7-芴）-alt-2，7-（9，9-二辛基芴）]（PFN）夹层，在-0.5 V偏压下，暗电流密度有效地从0.07 mA cm-2降低到1.92 × 10 - 5 mA cm-2。在-0.5 V的低反向偏压下（550 nm），OPD的信噪比（SNR）为1.93 × 105，带宽为10 MHz，琼斯探测率为9.10 × 1012。我们的研究为高性能OPD提供了一条很有前途的途径。
Low dark current density plays a key role in determining the overall performance of organic photodetectors (OPDs). However, both the donor domains and acceptor domains in the bulk heterojunction, which has high exciton dissociation efficiency, are in contact with the two electrodes. Therefore, the undesirable charge injection from the electrodes to the active layer is hard to avoid, leading to a high dark current density in most OPDs. In this work, we fabricate the OPDs based on a conventional poly(3-hexylthiophene) (P3HT)/(phenyl-C61-butyric-acid-methyl-ester) (PC61BM) bulk heterojunction. By incorporating a water/alcohol soluble conjugated polymer (WSCP), poly[(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN), interlayer between the anode and the active layer, the dark current density is effectively reduced from 0.07 mA cm−2 to 1.92 × 10−5 mA cm−2 under a −0.5 V bias. The resulting OPDs show a 1.93 × 105 signal-to-noise ratio (SNR), a 10 MHz bandwidth, and a 9.10 × 1012 Jones detectivity at a low reverse bias of −0.5 V (at 550 nm). Our research provides a promising way for high performance OPDs.