Self-Powered UV Photodetectors Based on Hydrothermal Barium Titanate Film Modified With Reduced Graphene Oxide Nanolayer

被引：1
作者：
Padhi, Rohit Raj [1 ]
Feng, Guo-Hua [1 ,2 ]
机构：
[1] Natl Tsing Hua Univ, Inst Nano Engn & MicroSyst, Hsinchu 30013, Taiwan
[2] Natl Tsing Hua Univ, Dept Power Mech Engn, Hsinchu 30013, Taiwan
来源：
IEEE SENSORS JOURNAL | 2024年 / 24卷 / 21期
关键词：
Barium titanate (BTO); photodetector (PD); polarization; pyroelectric; ultraviolet (UV); HETEROJUNCTION;
D O I：
10.1109/JSEN.2024.3462992
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
TiO2-based nanomaterials have been wellstudied for building high-performance ultraviolet (UV) photodetectors (PDs). However, their low interface crystallinity has always limited the creation of photogenerated carriers. In this work, a highly efficient, self-powered reduced graphene oxide (rGO)/barium titanate (BaTiO3, BTO) UV PD with a flexible structure is presented. The hydrothermal BTO film, grown from a TiO2 structure with very good polarization and ferroelectric properties, rGO, possesses a large surface area and good carrier mobility. The self-polarized electric field of the BTO film regulates carrier separation with the assistance of the rGO nanolayer, thus increasing photogenerated carrier generation. The fine crystalline structure of BTO film with a crystal size of 16.2 nm is verified. A coercive field of 7 kV/cm for the rGO/BTO device is less than that of 12 kV/cm for the BTO device. Lower coercive fields tend to have faster switching times, stability, and energy efficiency. The response (I-t) of the PDs was done under an isolated chamber containing a UV source having an intensity of 6 mu W.cm(-2). The responsivity of BTO and BTO/rGO devices is found to be 0.185 and 29.4 A/W, respectively. The current-voltage (I-V) characteristic was affected by different poling schemes. The temperature effect of the UV PDs is also investigated for practical application. Results show that a significant photocurrent increase was obtained for the rGO device for different poling and temperature conditions under self-powered operation.
引用
收藏
页码：34290 / 34298
页数：9
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