Voltage-tunable dual-band quantum dot infrared photodetectors for temperature sensing

Hong-Shi Ling, Shiang-Yu Wang, Cheng-Wei Hsu, Chien-Ping Lee

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We report voltage-tunable 3-5 mu m & 8-12 mu m dual-band detection in the InAs/Al0.3Ga0.7As/In0.15Ga0.85As confinement-enhanced dots-in-a-well quantum dot infrared photodetectors. The capability in temperature sensing is also demonstrated. Distinct response peaks at 5.0 mu m and 8.6 mu m were observed in the photocurrent spectra with working temperature up to 140K. The two peaks correspond to the transition paths from the quantum dot ground state to the quantum well state and the quantum dot excited state, respectively. At 77K, the response ratio of the 8.6 mu m peak over the 5.0 mu m peak changes from 0.29 at -3V to 5.8 at + 4.8V. Excellent selectivity between the two peaks with bias voltage makes the device attractive for third-generation imaging systems with pixel-level multicolor functionality. (C)2012 Optical Society of America
Original languageEnglish
Pages (from-to)10484-10489
Number of pages6
JournalOptics Express
Issue number10
StatePublished - 7 May 2012



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