標題: Enhanced normal-incident absorption of quantum-dot infrared photodetectors with smaller quantum dots
作者: Tseng, Chi-Che
Chou, Shu-Ting
Chen, Yi-Hao
Chen, Cheng-Nan
Lin, Wei-Hsun
Chung, Tung-Hsun
Lin, Shih-Yen
Chiu, Pei-Chin
Chyi, Jen-Inn
Wu, Meng-Chyi
光電工程學系
Department of Photonics
關鍵字: quantum dot (QD);quantum-dot infrared photodetector (QDIP)
公開日期: 1-Jul-2008
摘要: Ten-period InAs-GaAs quantum-dot (QD) infrared photodetectors grown under different In adatom supply procedures are investigated. Two In adatom supply procedures of In shutter 1) always opened and 2) periodically opened/closed are adopted in this letter. Larger QD sizes in both height and diameter and more uniform size distribution are observed for samples grown under an In shutter periodically opened/closed condition. The device with QDs grown under the In shutter always opened condition has revealed shorter detection wavelengths and enhanced normal incident absorption. The phenomenon shows that beside the increase of energy difference between confinement states, smaller QD sizes would also enhance the normal incident absorption predicted for the theoretically zero-dimensional QD structures.
URI: http://dx.doi.org/10.1109/LPT.2008.926020
http://hdl.handle.net/11536/8663
ISSN: 1041-1135
DOI: 10.1109/LPT.2008.926020
期刊: IEEE PHOTONICS TECHNOLOGY LETTERS
Volume: 20
Issue: 13-16
起始頁: 1240
結束頁: 1242
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