CaxSr1-xF2 的带隙工程及其作为具有可控光谱响应的无滤光真空紫外光电探测器的应用,Optical Materials

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CaxSr1-xF2 的带隙工程及其作为具有可控光谱响应的无滤光真空紫外光电探测器的应用
Optical Materials ( IF 3.8 ) Pub Date : 2019-02-01 , DOI: 10.1016/j.optmat.2018.12.023
Kentaro Suzuki , Marilou Cadatal-Raduban , Masahiko Kase , Shingo Ono

摘要我们通过实验证明，可以通过调节 CaF2 和 SrF2 的组成比来设计氟化钙和氟化锶混合晶体（CaF2 – SrF2，CaxSr1-xF2）的带隙。通过增加 CaF2 含量，带隙增加，吸收边缘发生蓝移。可以在纯 SrF2 的 9.73 eV 和纯 CaF2 的 10.24 eV 之间获得一系列带隙能量。一阶拉曼频移从纯 SrF2 的 285.2 cm-1 线性增加到纯 CaF2 的 327.8 cm-1。即使在非常低的温度下也能保持操纵带隙的能力。制造真空紫外 (VUV) 光电导探测器以探索不同成分比对光谱灵敏度的影响。随着带隙的增加，光电探测器的光谱响应向更短的波长移动。This allows the spectral response to be controlled by appropriately choosing the CaF2 – SrF2 ratio. 使用 CaxSr1-xF2 传感器还不需要额外的过滤器来滤除不需要的较长波长，因为它们的吸收开始发生在 VUV 区域。CaxSr1-xF2 光电探测器的可控光谱响应和无滤波器特性提供了优于当前可用的基于氧化物、氮化物和金刚石的光电探测器的优势。

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Band gap engineering of CaxSr1-xF2 and its application as filterless vacuum ultraviolet photodetectors with controllable spectral responses

Abstract We experimentally demonstrate that the band gap of mixed crystals of calcium fluoride and strontium fluoride (CaF2 – SrF2, CaxSr1-xF2) can be engineered by modulating the composition ratio of CaF2 and SrF2. By increasing the CaF2 content, the band gap increases and the absorption edge is blue-shifted. A range of band gap energies can be obtained between 9.73 eV for pure SrF2 and 10.24 eV for pure CaF2. The first order Raman frequency shift increases linearly from 285.2 cm−1 for pure SrF2 to 327.8 cm−1 for pure CaF2. The ability to manipulate the band gap is maintained even at very low temperatures. Vacuum ultraviolet (VUV) photoconductive detectors are fabricated to explore the effect of varying composition ratios on spectral sensitivity. The spectral response of the photodetectors shifts to shorter wavelengths as the band gap increases. This allows the spectral response to be controlled by appropriately choosing the CaF2 – SrF2 ratio. Using CaxSr1-xF2 sensors also eliminates the need for extra filters to cut off unwanted longer wavelengths as the onset of their absorption occur in the VUV region. The controllable spectral response and filterless feature of CaxSr1-xF2 photodetectors provide an advantage over currently available oxide-, nitride-, and diamond-based photodetectors.

更新日期：2019-02-01

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