arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.08714cond-mat.mtrl-sciphysics.app-ph
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锌锡氧化物光电薄膜晶体管在亚带隙光激发下的尾态诱导的类半导体相变

Tail-states induced semiconductor-toconductor like transition under sub-bandgap light excitation in the zinc-tin-oxide photothinfilm transistors

Soumen Dhara, Kham M. Niang, Andrew J. Flewitt, Arokia Nathan, Stephen A. Lynch

摘要:

本文报道了在锌锡氧化物(ZTO)光电薄膜晶体管(TFT)中,一个巨大的持续光电导(PPC)引起的类似晶体管到导体的转变。有源ZTO沟道层采用远程等离子体反应溅射法制备,具有非晶结构。在紫外光亚带隙激发下,ZTO的光电流高达~10 - 4A(光暗电流比为~10 7),并且在关断光后仍保持在这个高值附近.在此期间,ZTO TFT显示出具有长恢复时间的巨大PPC,这导致ZTO化合物经历了类似于半导体到导体的转变。在目前的情况下,电导率的变化超过6个数量级,从~10-7到0.92 Ω -1cm-1。在紫外线照射后,ZTO化合物可以保持导电状态长达一个月。所观察到的PPC效应的基本物理研究通过研究缺陷(深态和尾态),采用放电电流分析(DCA)技术。DCA研究的结果揭示了ZTO的子间隙尾态参与巨型PPC的直接证据,而深态有助于轻度PPC。

英文摘要:

We report on a giant persistent photoconductivity (PPC) induced semiconductor-to-conductor like transition in zinc-tin-oxide (ZTO) photo-thinfilm transistors (TFT). The active ZTO channel layer was prepared by remote-plasma reactive sputtering and possesses an amorphous structure. Under subbandgap excitation of ZTO with UV light, the photocurrent reaches as high as ~10 -4 A (a photo-to-dark current ratio of ~10 7) and remains close to this high value after switching off the light. During this time, the ZTO TFT exhibits gigantic PPC with long-lasting recovery time, which leads the ZTO compound to undergo a semiconductor-to-conductor like transition. In the present case, the conductivity changes over six orders of magnitude, from ~10-7 to 0.92 Ω -1cm-1. After UV exposure, the ZTO compound can potentially remain in the conducting state for up to a month. The underlying physics of the observed PPC effect is investigated by studying defects (deep-states and tail-states) by employing a discharge current analysis (DCA) technique. Findings from the DCA study reveal direct evidence for the involvement of sub-gap tail-states of the ZTO in the giant PPC, while deep-states contribute to mild PPC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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