Department of Physics, Chungnam National University, Daejeon, Republic of Korea.
Nanotechnology. 2017 Nov 24;28(47):475706. doi: 10.1088/1361-6528/aa8fa5.
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.
我们研究了通过化学气相沉积生长的 PbS 纳米线的光学性质和光电特性。在中红外光谱范围内观察到明显的带边光致发光（PL）发射，并且从 PL 峰能量估算出的量子限制效应在 40meV 以内，与纳米线的平均直径（约 70nm）明显大于激子玻尔半径（约 18nm）一致。我们还展示了利用这些悬浮在两个预图案化 Ti 电极之间的 PbS 纳米线制作的叉指光电探测器，其中 Ti 也用作纳米线生长的金属催化剂。在室温下，光电电流的阈值波长被发现约为 3μm。
