纤维状有机光电探测器制备与特性研究  

Fabrication and properties of fiber-based organic photodetectors

作　　者：武雪源 杜晓松[1] 刘青霞 太惠玲[1] 王洋[1] Wu Xueyuan;Du Xiaosong;Liu Qingxia;Tai Huiling;Wang Yang(State Key Laboratory of Electronic Thin Film and Integrated Devices,School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu,Sichuan 610054,China)

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,光电科学与工程学院,四川成都610054

出　　处：《光电工程》2023年第1期59-67,共9页Opto-Electronic Engineering

基　　金：国家自然科学基金资助项目(U19A2070、2210050869);国家杰出青年科学基金项目(62225106);四川省科技计划项目(2021YFH0186);四川省科技创新苗子工程(2021062)。

摘　　要：纤维状光电探测器因具有柔性可编织、全角度光探测等特性,有望在可穿戴电子领域取得广泛应用。现已报道的纤维状光电探测器多采用无机光敏材料,器件存在机械柔性受限、制备工艺复杂等问题。本文提出制备纤维状有机光电探测器(FOPD),采用浸渍提拉法依次在锌丝表面制备电子传输层(ZnO)、有机体异质结光敏层(PBDB-T:ITICTh)和空穴传输层(PEDOT:PSS)等功能层,最后缠绕银丝或碳纳米管纤维(CNT)作为外电极,制备了两种柔性FOPD。结果表明,两种器件在可见光波段均具有优良的响应,整流特性明显,在-0.5 V偏压下比探测率均可达10^(11)Jones (300 nm~760 nm)。其中,CNT外电极与光敏层的界面接触更佳,器件具有更低的暗电流密度(9.5×10^(-8)A cm^(-2),-0.5 V)和更快的响应速度(上升、下降时间:0.88 ms、6.00 ms)。本文的研究有望为柔性纤维器件和可穿戴电子领域的发展提供新思路。Fiber-based photodetectors are expected to be widely used in the field of wearable electronics due to their properties of flexibility, easy-to-weave, and omnidirectional light detection. Currently reported fiber-based photodetectors mostly use inorganic photosensitive materials, which have drawbacks such as limited mechanical flexibility and complex preparation processes. In this paper, we proposed the fiber-based organic photodetector(FOPD). The electron transport layer(ZnO), organic heterojunction photosensitive layer(PBDB-T:ITIC-Th), and hole transport layer(PEDOT: PSS) were prepared on zinc wire by a solution dip-coating method layer by layer.Finally, silver wire or carbon nanotube fiber(CNT) was wrapped as the external electrode, and two kinds of flexible FOPDs were obtained and showed typical rectification characteristics. They showed a specific detection rate of 10^(11)Jones(300 nm~760 nm) at-0.5 V bias. Due to the better interface contact between the CNT external electrode and photosensitive layer, the CNT-based device exhibited lower dark current density(9.5×10^(-8)A cm^(-2),-0.5 V) and faster response speed(rise time of 0.88 ms and fall time of 6.00 ms). The work is expected to provide new ideas for the development of flexible fiber-based devices and wearable electronics.

关 键 词：有机光电探测器 纤维状光电探测器 浸渍提拉法 缠绕式电极 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TN36[电子电信—物理电子学]