光电探测器
红外线的
材料科学
紫外线
半金属
光电子学
航程(航空)
热的
光学
硅
物理
气象学
复合材料
作者
Cong Xia,Tong Yu,Jianying Liu,Xin Li,Jiajia Wang,Shihui Ma,Ning Ye,Hailong Qiu,Zhanggui Hu,Ning Ye,Jiyang Wang,Yicheng Wu
标识
DOI:10.1002/adom.202400314
摘要
Abstract Ultra‐broadband photodetectors based on semimetal crystals have recently become popular because of their gapless band structures. In particular, semimetal crystals have large carrier mobility or high Seebeck coefficient; this almost eliminates the possibility of using semimetal crystals as photodetectors. In addition, a larger temperature gradient can cause photocurrent generation based on the photothermoelectric effect. Surprisingly, the TaTe 2 crystal has a huge absorption coefficient (≈10 4 cm −1 ), a minimal specific heat (≈0.172 J g −1 K −1 ), and a low thermal conductivity (0.3 W m −1 K −1 ), which is beneficial for generating a high photothermal conversion efficiency of 30.2%, despite its small Seebeck coefficient, and achieving a large temperature gradient occurs for the heat generated by external illumination. Herein, the possibility of photoresponse based on the TaTe 2 detector is explored, which has a low carrier mobility (≈10 cm 2 V −1 s −1 ) and a small Seebeck coefficient (≈7.1 µV K −1 ). The self‐powered TaTe 2 photodetector can also provide a competitive photoresponse range from 355 to 2715 nm and exhibit a maximum responsivity of 1.1 mA W −1 with a detectivity of 4.7 × 10 8 Jones at 455 nm. This study provides a new design scheme and operating mechanism for semimetal photodetectors and enriches semimetal crystal photodetectors.
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