Optical properties and bridge photodetector integration of lead sulfide nanowires
- Optical properties and bridge photodetector integration of lead sulfide nanowires
- 김상혁; 박재관; 최원준; 임주희; Jungdong Kim; Eunsoon Oh; Rui Xiao; Sean Ritter; Yiming Yang; Dong Yu
- Issue Date
- VOL 28, NO 47-475706-7
- We studied optical properties and photocurrent characteristics of PbS nanowires grown by chemical vapor deposition. Distinct bandedge photoluminescence (PL) emission was observed in the mid-infrared spectral range and the quantum confinement effect estimated from the PL peak energy was within 40 meV, consistent with the average diameter of the nanowire (~70 nm) being significantly larger than the exciton Bohr radius (~18 nm). We also demonstrated interdigit photo detectors making use of these PbS nanowires suspended between two pre-patterned Ti electrodes, where Ti also acted as metal catalyst for the nanowire growth. The threshold wavelength of the photocurrent was found to be ~3 μm at room temperature.
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