2018
DOI: 10.1021/acs.jpcc.8b09469
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Micron-Scale Photodetectors Based on One-Dimensional Single-Crystalline Sb2–xSnxSe3 Microrods: Simultaneously Improving Responsivity and Extending Spectral Response Region

Abstract: Among various 1D materials, antimony selenide (Sb 2 Se 3) has the large visible to near-infrared (Vis-NIR) absorption cross section and excellent stability, thus it shows a huge potential to be applied as photodetectors. However, low electrical conductivity (10-6 Ω-1 •m-1 in bulk state) largely limits the extensive applications of Sb 2 Se 3. By a hot-injection based Sn/Sb substitution strategy,

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Cited by 15 publications
(13 citation statements)
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“…In addition, the responsivity ( R ) and specific detectivity ( D *) of the epitaxial Sb 2 Se 3 film photodetector were also investigated to further evaluate the detector performance. Here, R is defined as R = I ph / PA , where A is the active area of the photodetector, and P is the given power density of the incident light. D * is defined as D * = RA 1/2 /(2 eI dark ) 1/2 , , where R is the responsivity, and e is the unit charge.…”
Section: Resultsmentioning
confidence: 99%
“…In addition, the responsivity ( R ) and specific detectivity ( D *) of the epitaxial Sb 2 Se 3 film photodetector were also investigated to further evaluate the detector performance. Here, R is defined as R = I ph / PA , where A is the active area of the photodetector, and P is the given power density of the incident light. D * is defined as D * = RA 1/2 /(2 eI dark ) 1/2 , , where R is the responsivity, and e is the unit charge.…”
Section: Resultsmentioning
confidence: 99%
“…Detectivity is another performance index to evaluate the detection sensitivity. It can be calculated by , where R is the peak responsivity, q is the elemental charge, and J d is the density of the dark current which is 68.6 pA/cm 2 in this work. Because of the ultralow dark current density, the detectivity reaches 9.8 × 10 15 cm Hz 1/2 /W at 20 V.…”
Section: Resultsmentioning
confidence: 99%
“…Under the 254 nm illumination with intensity of 0.5 mW/cm 2 , the responsivity is calculated to be 46 A/W at 20 V. Detectivity is another performance index to evaluate the detection sensitivity. It can be calculated by 20,21…”
Section: Resultsmentioning
confidence: 99%
“…As is well known, the band gap of Sb 2 Se 3 and NiSe is 1.16 and 2.0 eV, respectively. It is easy to understand that the band gap energy of (Sb 1– x Ni x ) 2 Se 3 will increase with the increase of doping concentration of Ni in the samples according to the basic band theory of solid, resulting in the blue shift of the UV–vis absorption spectrum of the samples, which is consistent with the previous reports. , The enlarged band gap of (Sb 1– x Ni x ) 2 Se 3 nanorods is also consistent with the theoretical calculation, which will be discussed subsequently. The tunable band gap of the (Sb 1– x Ni x ) 2 Se 3 nanorods overlap well with the solar spectrum, implying their promising application in high-performance broadband photodetectors.…”
Section: Results and Discussionmentioning
confidence: 99%
“…It is easy to understand that the band gap energy of (Sb 1−x Ni x ) 2 Se 3 will increase with the increase of doping concentration of Ni in the samples according to the basic band theory of solid, resulting in the blue shift of the UV−vis absorption spectrum of the samples, which is consistent with the previous reports. 28,29 The enlarged band gap of (Sb 1−x Ni x ) 2 Se 3 nanorods is also To investigate the influence of Ni 2+ ions on the electrical properties of the (Sb 1−x Ni x ) 2 Se 3 nanorods, an essential method based on the Hall-effect measurement was used. Table 1 shows the electrical conductivity, carrier concentration, mobility, and conduction type of the (Sb 1−x Ni x ) 2 Se 3 nanorods as a function of the doping concentration of Ni 2+ ions (x value).…”
Section: ■ Results and Discussionmentioning
confidence: 99%