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The Thickness Effect of p-AlGaN
Blocking Layer in
UV-A Bandpass Photodetectors
Outline
 Introduction
 Experiments
 Results
and Discussion
 Conclusion
 References
Introduction

此UV-A Bandpass Photodetectors,主要是用於檢測紫
外光的多寡,可運用於民生用品上,提醒紫外線是否過
量。

此Bandpass Photodetectors,應用窄通道( Bandpass )
的原理讓光檢測器只能吸收到特定範圍的光,本篇主要
是吸收波長在337nm~365nm的紫外光。
Experiments
Ni-Au
at 1050 ℃
p
主
動
層
i
337nm
n
30-nm低濃
度GaN
buffer layer
at 550 ℃
365nm
Ti-Al-Ti-Au
1150℃
Results and Discussion
354nm ; 0.131A/W
357nm ; 0.129A/W
356nm ; 0,13 A/W
Spectral responsivities of nitride-based p-i-n bandpass photodetectors
at room temperature.
η:quantum efficiency(量子效率)
R:measured responsivity(響應)
-19
×
q :electron charge(基本電荷1.62 10 )
λ:incident light wavelength(入射光波長)
-32
h :Planck constant(普郎克常數6.62 ×10 )
10
c :speed of light(光速率2.99 ×10 )
by:
Sample A
-19
×
354 × 10 )/(6.626 × 10
-19
×
357 × 10 )/(6.626 × 10
0.131= η × ( 1.6 × 10
η = 0.46 × 100%≒46 %
-9
-34
×
2.99 ×10 )
8
-9
-34
×
2.99 ×10 )
Sample B
0.129= η × ( 1.6 × 10
η = 0.45 × 100%≒45 %
8
Sample C
-19
-9
0.13= η × ( 1.6 × 10 × 356× 10 )/(6.626 × 10
η = 0.45 × 100%≒45 %
-34
×
8
2.99 ×10 )
Current–voltage characteristics of the nitride-based p-i-n bandpass
photodetectors at room temperature with fitting curve. R = (dV=dI)
at zero bias.
Conclusion

一個好的光檢測器必須具備,輕薄短小、使用低電壓、低電
流以及在光檢測器必須工作的波長範圍中,必須具有高度的
靈敏度、高響應速率和低雜訊,有這些效應就可成為一可靠
度高的光檢測器。
References

The Thickness Effect of p-AlGaN Blocking Layer in UV-A Bandpass Photodetectors, C. K.
Wang, T. K. Ko, C. S. Chang, S. J. Chang, Y. K. Su, T. C. Wen, C. H. Kuo, and Y. Z. Chiou。