(3.238.206.122) 您好!臺灣時間:2021/04/21 10:10
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果

詳目顯示:::

我願授權國圖
: 
twitterline
研究生:謝宜靜
研究生(外文):Yi-Jung Hsieh
論文名稱:束縛至連續態多重量子井紅外光偵測器
論文名稱(外文):Theoretical model for bound-to-continuum multiple quantum well infrared photodetector
指導教授:洪茂峰;王永和
指導教授(外文):M. P. Houng;Y. H. Wang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:電機工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:1994
畢業學年度:82
語文別:英文
論文頁數:80
中文關鍵詞:束縛態連續態響應度
外文關鍵詞:Bound stateContinuum stateResponsivity
相關次數:
  • 被引用被引用:0
  • 點閱點閱:77
  • 評分評分:系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
本論文提出一束縛至連續態子能階間光躍遷之理論模型,以探討束縛至連
續態量子井紅外光偵測器之工作原理,並對此元件之設計原則做一完整且
詳細的討論,由於量子井子能階的能量對光偵測器的波段位置有直接的影
響,故吾人採用一能量及空間相依的有效質量近似法可準確計算出束縛及
連續態子能階的分佈,進而預測光吸收係數之頻寬和峰值位置隨量子井參
數(如量子井寬度,量子井位障高度 ,寬度)變動的情形.由計算的結
果吾人發現,束縛至連續態子能階間光躍遷雖比傳統束縛至束縛態子能階
間光躍遷有較小的光吸收係數,但由於其傳輸機制是藉由束縛態躍遷至連
續態之熱載子通過量子井位障上方,而非像束縛態躍遷至束縛態之激發電
子須藉由穿透位障才能離開量子井,故可以適當的加寬量子井位障的寬度
並有效抑制暗電流.此結果與最近許多實驗所觀察 到的束縛至連續態具
有較束縛至束縛態更大的響應度之現象不謀而合.由以上計算的結果,吾
人更進一步求得紅外光偵測器之重要參數(如光增益,量子效益,響應度
,偵測度等),以期對束縛至連續態量子井紅外光偵測器之元件結構建立
一理論模型,並提供最佳化元件之設計準繩.

In this thesis, we present a theoretical model for bound-to-
continuum state intersubband optical transition so as to
provide a detail design rule for bound-to-continuum multiple
quantum well infrared photodetector. The positions of subband
levels will directly decide the absorption wavelength of
photodetector, we develop an energy- and spatial-dependent
effective mass approach method to calculate the subband
structures of bound states and continuum states. Furthermore,
by our theoretical calculation results above, we can understand
how the absorption peak wavelength and bandwidth vary with the
quantum well parameters (such as well width, barrier height and
barrier width). As shown in the theoretical calculations, we
note that the bound-to-continuum state intersubband optical
transition has smaller optical absorption coefficient than
bound-to-bound state intersubband optical transition, and these
extended state detectors of the front are based on hot-electron
transport above the quantum well barriers, the photoexcited
electrons do not have to escape from the quantum well via
tunneling. Thus the thickness of the barriers can be
significantly increased, dramatically reducing the dark
current. This is the reason why the bound-to-continuum multiple
quantum well infrared photodetectors have larger responsivity
than bound-to-bound multiple quantum well infrared
photodetectors. The theoretical analysis included optical
absorption, quantum efficiency, responsivity, and detectivity
allow a better optimization of the QWIP performance.

QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
系統版面圖檔 系統版面圖檔