Long-wavelength infrared (LWIR) quantum-dot infrared photodetector (QDIP) focal plane array

Quantum structure based infrared detector research and development within Acreo’s centre of excellence IMAGIC

“…For undoped InAs/In 0.15 Ga 0.85 As/GaAs DWELL IPs, peak responsivities of 25 mA/W at an operating temperature of 77 K have been measured [7] and by using optical pumping as artificial doping, a peak responsivity of 250 mA/W has been predicted [8]. This is in fairly good agreement with the DWELL IPs demonstrated by Gunapala et al [9] for DWELL IPs with normal incidence detection. The responsivity of our detectors is at present limited by the escape processes from the detector, dominated by thermally assisted tunneling [7] and the lack of doping in the active region of the DWELL IP.…”

Review of current progress in quantum dot infrared photodetectors

“…Fig. 4 shows quoted BLIP temperatures from various groups for QWIPs [91,92,[94][95][96][97][98][99][100][101][102] and QDIPs [30,31,66,67,73,77,[103][104][105][106][107]. The data have been broadly divided based on field of view for fair comparison.…”

“…Normalized NETD is plotted as a function of wavelength in Fig. 7 for both QDIPs [67,68,105,[133][134][135][136][137] and QWIPs [91,92,102,126,128,[138][139][140]. For fair comparison, all NETD data points are scaled to have an f-number (f ) of 2, using the following relation [116]:…”

“…The most popular methods include the atomistic pseudopotential approach [62], eight-band k.p analysis [21,59,60,63] based on the valance force field method and numerical simulations based on finite volume methods [64,65]. Various groups around the world have successfully demonstrated good-quality infrared imaging [66][67][68][69][70] with QDIP-based FPAs. There are excellent articles covering the physics of QDIPs [61,71,72] and also that discuss the fundamental advantages and device characteristics as well as the stateof-the-art reviews [29,45,69,73,74].…”

SiGe/Si Quantum-Dot Infrared Photodetectors With ${\bm \delta}$ Doping

“…However, the atmospheric transmission windows are at 3-5.3 µm and 7.5-14 µm, and a multicolor photodetection covering these windows is attractive in thermal imaging, target identification, medical, and other applications [3]. The multicolor detection has been demonstrated using the QDsin-a-well structures [4]- [6], and the focal plane arrays based on these are also designed [7], [8]. The dual-band detector has also been demonstrated by the method of homojunction interfacial workfunction internal photoemission [9].…”