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Improvements of AlGaN/GaN p-i-n UV sensors with graded AlGaN layer for the UV-B (280-320 nm) detection

机译:具有渐变AlGaN层的AlGaN / GaN p-i-n UV传感器的改进,用于UV-B(280-320 nm)检测

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摘要

Al_xGa_(1-x)N/GaN p-i-n UV sensors grown by metal organic chemical vapor deposition (MOCVD) were fabricated for the UV-B (280-320 nm) detection. With a proper structure design by including a thin top p-layer and a graded Al_xGa_(1-x)N (x = 0.26 → 0.13) layer, the etching pit density (EPD) and the specific contact resistance of top p-layer can be significantly decreased. Device dark current density decreased from 3.5 x 10~(-7) to 2.49 x 10~(-11) A/cm~2 at —3V and the spectrum responsivity at 310 nm UV-B range is 0.04 A/W, which is much better than traditional AlGaN-based devices without graded layer design.
机译:制作了通过金属有机化学气相沉积(MOCVD)生长的Al_xGa_(1-x)N / GaN p-i-n UV传感器用于UV-B(280-320 nm)检测。通过适当的结构设计,包括一个薄的顶层p层和一个渐变的Al_xGa_(1-x)N(x = 0.26→0.13)层,顶层p层的刻蚀坑密度(EPD)和比接触电阻可以被大大减少。器件暗电流密度在-3V时从3.5 x 10〜(-7)降至2.49 x 10〜(-11)A / cm〜2,并且在310 nm UV-B范围内的光谱响应率为0.04 A / W,这是比没有渐变层设计的传统基于AlGaN的器件好得多。

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