Absorption, photoluminescence (PL), photoresponse, and I-V measurements were made for a close-packed HgTe nanoparticle film without organic capping materials to investigate its optoelectronic characteristics in the infrared (IR) range. In the absorption and PL spectra taken for the close-packed nanoparticle film, the wavelength of exciton peak was red-shifted, compared with 1-thioglycerol capped HgTe nanoparticles dispersed in solution. For the HgTe nanoparticle film, dark current was below several pA level, current was increased by about three orders of magnitude at a biased voltage of 3 V under the illumination, and photoresponse was very rapid compared with 1-thioglycerol capped HgTe nanoparticles. These optoelectronic characteristics illustrate that HgTe nanoparticles are one of promising materials for the photodetector in the IR range. Finally, the origin for the increase of photocurrent with increasing temperature observed in this study will be discussed.
Bibliographical noteFunding Information:
This work was supported by the National Research Laboratory Program, the 0.1 Terabit Non-Volatile Memory Development, National R&D Project for Nano Science and Technology, National Nuclear Technology Program supported by Ministry of Science and Technology (MOST), and Center for Integrated-Nano-Systems (CINS) supported by Korea Research Foundation (KRF-2004-005-D00087).
- A. HgTe nanoparticles
- B. Trap-mediated hopping process
- D. Photocurrent
- E. Photoluminesence
ASJC Scopus subject areas
- Condensed Matter Physics
- Materials Chemistry