Effect of operating temperature on performance of obliquely deposited Bi, Sb, and Bi-Sb semimetal thin film laser detectors
27 Dec 2005-Vol. 1, pp 162-164
TL;DR: In this article, the authors studied the structural properties of Bi, Sb, and Bi-Sb alloy thin films and found that the maximum responsivity for these detectors can be obtained at 75/spl deg/C and the dependence of responsivity on the width of detectors was investigated.
Abstract: Obliquely deposited (70/spl deg/) Bi, Sb, and Bi-Sb alloy thin films have been prepared by thermal resistive technique. Structural properties of these films were studied using XRD. Their resistance and voltage responsivity for Nd:YAG and CO/sub 2/ laser pulses have been recorded as function of operating temperature between 10/spl deg/C and 120/spl deg/C. It was found that the maximum responsivity for these detectors can be obtained at 75/spl deg/C. On the other hand, the dependence of responsivity on the width of detectors was investigated.
References
More filters
TL;DR: In this article, the authors proposed to use quantum-well superlattice structures to enhance the performance of thermoelectric coolers and showed that layering has the potential to increase significantly the figure of merit of a highly anisotropic material.
Abstract: Currently the materials with the highest thermoelectric figure of merit Z are ${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$ alloys. Therefore these compounds are the best thermoelectric refrigeration elements. However, since the 1960s only slow progress has been made in enhancing Z, either in ${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$ alloys or in other thermoelectric materials. So far, the materials used in applications have all been in bulk form. In this paper, it is proposed that it may be possible to increase Z of certain materials by preparing them in quantum-well superlattice structures. Calculations have been done to investigate the potential for such an approach, and also to evaluate the effect of anisotropy on the figure of merit. The calculations show that layering has the potential to increase significantly the figure of merit of a highly anisotropic material such as ${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$, provided that the superlattice multilayers are made in a particular orientation. This result opens the possibility of using quantum-well superlattice structures to enhance the performance of thermoelectric coolers.
3,202 citations
TL;DR: In this article, the potential of low dimensional thermoelectric materials for enhanced performance is reviewed, with particular attention given to quantum wells and quantum wires, and the high potential of bismuth as a low-dimensional material is discussed.
Abstract: The promise of low dimensional thermoelectric materials for enhanced performance is reviewed, with particular attention given to quantum wells and quantum wires. The high potential of bismuth as a low-dimensional thermoelectric material is discussed.
282 citations
TL;DR: Using a high-temperature organic solution reduction method, highly crystalline and single domain bismuth nanoparticles have been synthesized and self-assembled.
52 citations
TL;DR: In this paper, an in situ polymerization technique using methyl methacrylate (monomer) and 2-hydroxyethyl methacelate (co-monomer), with cross-link agent was employed, and polymeric network was formed around the water droplets.
49 citations
TL;DR: In this paper, a thin-film thermocouple detector suitable for use with molecular lasers operating in the middle and far infrared has been developed, with measured response times of approximately 10−7 sec.
Abstract: A thin‐film thermocouple detector, suitable for use with molecular lasers operating in the middle and far infrared has been developed. Measured response times are approximately 10−7 sec. The noise equivalent power is of the order of 10−7 W/Hz.
19 citations