[PDF] Top 20 Voltage-tunable two-color quantum-dot infrared photodetectors

... Quantum-dot infrared photodetectors 共QDIPs兲 have been widely investigated in recent ...ventional quantum-well infrared photodetectors 共QWIPs兲, advantages such as ... See full document

... transform infrared spectrometer and the absolute responsivity was calibrated with 1000 °C blackbody radiation with a Ge wafer to filter out photons with wavelength shorter than 2 ...3(a). Two well separated ... See full document

... According to this result, this device is advantageous for the fabrica- tion of grating-less QDIP devices. 4. Conclusions In the conclusion, a two-terminal QDIP with stacked 5-period InAs/GaAs and InGaAs-capped ... See full document

... III. R ESULTS AND D ISCUSSION Normalized 10 K spectral responses of devices A and B op- erated at 2.0 V are shown in Fig. 1(a). As show in the figure, peak responses of 6 and 7.9 m are observed for Samples A and B, ... See full document

... and voltage, the carrier number inside the QD ...idea, two QDIPS with identical device structure but dif- ferent QD doping density was ...the two samples at 77 ... See full document

... The total field is dominated by the QD charge field which is a func- tion of voltage and temperature. With the average charge number calculated from the current gain, the tunneling probability was cal- culated and ... See full document

... small dot while leaves the tip of the large dots ...more voltage to escape from the bound ex- cited ...[11]. Two ex- tremely tuning spectra are shown in ... See full document

... photocurrent ratios obtained via photocurrents measured under different polarized lights divided by the photocurrent under p-mode light at applied voltage 1.8 V of Devices A and B are shown in Fig. 4(b). Devices A ... See full document

... high-temperature operation infrared photodetectors in the LWIR range. In conclusion, a 10-period QD/QW MMIP is proposed in this pa- per. Responses at 4.8/12.7 and 5.3/10.3 l m at positive and negative ... See full document

... with two separate QD regions with different detection wavelengths, the result would be a voltage-tunable two-color QDIP as discussed elsewhere ... See full document

... as photodetectors at the inversion ...the quantum dot infrared photodetectors (QDIPs) and quantum well infrared detectors ...the quantum dot and ... See full document

... Fig. 3. Noise current gain of samples A and B as a function of the average electric field at 77 K. FWHM which mainly comes from the size nonuniformity of the QDs in sample A. Although the QDs have three-dimensional ... See full document

... SiGe dot with shorter annealing time after formation has a higher Ge concentration 共⬃60%兲 as compared to the bottom SiGe dot 共⬃40%兲, 7,8 which suffers longer annealing time after ... See full document

... The simple metal-insulator-semiconductor (MIS) structure with tunneling insulator can make the GeISi QDIP compatible with Si ULSl process, and make it possible to have conven[r] ... See full document

... 546 IEEE ELECTRON DEVICE LETTERS, VOL. 25, NO. 8, AUGUST 2004 Fig. 4. The 20 K PL spectrum for a multilayer Ge–Si quantum-dot structure. Si bandgap is 1:17 eV at 20 K, and the QD barrier is 0:4 eV. where ... See full document

... InAs–GaAs Quantum-Dot Infrared Photodetectors Shu-Ting Chou, Member, IEEE, Shih-Yen Lin, Member, IEEE, Chi-Che Tseng, Student Member, IEEE, Yi-Hao Chen, Cheng-Nan Chen, and Meng-Chyi Wu, ... See full document

... Fig. 3. Current gain curves of the two samples at 100 K and 200 K. B are fully covered. When positively biased, the photogener- ated electrons have to overcome the potential barrier of AlGaAs and pass through the ... See full document

... 10.1063/1.1347006兴 Quantum-well infrared photodetectors 共QWIPs兲 utilizing an intersubband transition have been extensively investigated over the last ...the quantum-well ...the quantum ... See full document

... 共InGa兲As quantum dots 共QDs兲 on GaAs substrates for practical applications and fun- damental research have been widely investigated in recent ...and quantum-dot infrared photodetectors ... See full document

... optimized quantum effi- ...with two mirrors, a top GMR mirror of Ge subwavelength grating laid on a SiO x layer and a bottom DBR mirror of GaAs/AlO x ... See full document