Ultrahigh Responsivity Self-powered Solar-blind Photodetector Based on Centimeter-Sized β-Ga2O3/Polyaniline Heterojunction
Ultrahigh Responsivity Self-powered Solar-blind Photodetector Based on Centimeter-Sized β-Ga2O3/Polyaniline Heterojunction
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基于厘米级β-Ga2O3/聚苯胺异质结的超高响应度自供电日盲光电探测器
DOI：
10.1039/c9nr09095a
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发表时间：
--
期刊：
影响因子：
6.7
通讯作者：
Aidong Shen
中科院分区：
文献类型：
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作者：
Yuefei Wang;Li Li;Hebin Wang;Longxing Su;Hongyu Chen;Wanpeng Bian;Jiangang Ma;Bingsheng Li;Zhiguo Liu;Aidong Shen
宽带隙半导体材料具有禁带宽度合适、晶体质量好、吸收能力强、载流子迁移率大等优点，是一种很有前途的紫外光探测材料。目前，深紫外探测器主要是基于外延薄膜，但外延薄膜具有p型掺杂困难等缺点。晶格失配阻碍了这些器件的进一步发展。本文采用厘米级单晶β-Ga 2 O3微丝和聚苯胺相结合的方法实现了一种高性能的自供电日盲紫外光电探测器。由于优异的有机/无机混合p-n结，该器件在246 nm处显示出21 mA W−1的响应度，截止波长为272 nm，无需外部电源。此外，暗电流为0.08 pA，这是小于几乎所有以前的金属氧化物基日盲紫外光电探测器。该光电探测器在零偏置电压下还显示出高的UV/可见光抑制比（102）。最后，还提出了一种自供电光电探测器的物理模型。本工作为制备高性能的基于有机/无机异质结的自供电日盲紫外光探测器提供了一种简单、低成本、有效的方法。
Wide band gap semiconductors are promising UV photodetector materials due to their suitable bandgap, high crystal quality, strong absorption and large carrier mobility. Up to now, deep UV photodetectors are mainly based on epitaxial thin films, which have some undesired properties such as p-type doping difficulty. Lattice mismatch hinders the further development of these devices. Here, a high performance self-powered solar-blind UV photodetector was realized by a facile combination of a centimeter-sized single crystal β-Ga2O3 microwire and polyaniline. Owing to the excellent organic/inorganic hybrid p–n junction, the device shows an ultrahigh responsivity of 21 mA W−1 at 246 nm with a sharp cut-off wavelength of 272 nm without an external power supply. Moreover, the dark current is 0.08 pA, which is smaller than those of almost all the previous metallic oxide based solar-blind UV photodetectors. The photodetector also shows a high UV/visible rejection ratio (102) at zero bias voltage. Finally, a physical model of the self-powered photodetector is also proposed. This work provides a simple, low-cost, and effective method for preparing high performance self-powered solar-blind UV photodetectors based on organic/inorganic heterojunctions.