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High responsivity and flexible deep-UV phototransistor based on Ta-doped β-Ga2O3
npj Flexible Electronics ( IF 12.3 ) Pub Date : 2022-06-17 , DOI: 10.1038/s41528-022-00179-3
Xiao-Xi Li , Guang Zeng , Yu-Chun Li , Hao Zhang , Zhi-Gang Ji , Ying-Guo Yang , Man Luo , Wei-Da Hu , David Wei Zhang , Hong-Liang Lu

Deep-ultraviolet (DUV) phototransistors have shown great potential applications in UV imaging, artificial intelligence, and wearable optoelectronics. Among a large number of wide bandgap semiconductors, the quasi-two-dimensional β-Ga2O3 is considered as an ideal candidate for DUV photodetector applications. Herein, we report a high responsivity (R) and fully flexible Ta-doped β-Ga2O3 DUV phototransistor which exhibits outstanding optoelectrical properties with a high R of 1.32 × 106 A/W, a large detectivity of 5.68 × 1014 Jones, a great photo-to-dark current ratio of 1.10 × 1010%, a high external quantum efficiency of 6.60 × 108%, and an ultra-fast response time of ~3.50 ms. Besides, the flexible Ta-doped β-Ga2O3 device also displays high reliability and mechanical flexibility that can sustain well after over 1 × 104 bending cycles. Moreover, high-contrast imaging of UV light was obtained on the flexible DUV detector arrays, which can be efficiently trained and recognized by an artificial neural network. Our findings offer a perspective to develop wearable optoelectronics and UV imaging based on high-performance flexible β-Ga2O3 DUV phototransistors, providing an inspiration for the future work in artificial intelligence and bionic robot fields.



中文翻译:

基于Ta掺杂的β-Ga2O3的高响应度和柔性深紫外光电晶体管

深紫外(DUV)光电晶体管在紫外成像、人工智能和可穿戴光电子学中显示出巨大的潜在应用。在大量的宽带隙半导体中,准二维β - Ga 2 O 3被认为是DUV光电探测器应用的理想候选者。在此,我们报道了一种高响应度 ( R ) 和完全柔性的 Ta 掺杂β -Ga 2 O 3 DUV 光电晶体管,它表现出出色的光电性能,具有1.32 × 10 6 A/W 的高R 和 5.68 × 10 14的大检测率Jones,1.10 × 10 的出色光暗电流比10 %,6.60 × 10 8 %的高外部量子效率和约3.50 ms 的超快响应时间。此外,柔性 Ta 掺杂β -Ga 2 O 3器件还显示出高可靠性和机械柔韧性,在超过 1 × 10 4次弯曲循环后仍能保持良好状态。此外,在柔性深紫外探测器阵列上获得了紫外光的高对比度成像,可以通过人工神经网络进行有效训练和识别。我们的研究结果为开发基于高性能柔性β -Ga 2 O 3的可穿戴光电和紫外成像提供了一个视角DUV光电晶体管,为未来在人工智能和仿生机器人领域的工作提供灵感。

更新日期:2022-06-17
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