scholarly journals Temperature-dependent n−p transition in a three-dimensional Dirac semimetal Na3Bi thin film

2017 ◽  
Vol 96 (23) ◽  
Author(s):  
Chang Liu ◽  
Jack Hellerstedt ◽  
Mark T. Edmonds ◽  
Michael S. Fuhrer
Keyword(s):  
Thin Film ◽  
Three Dimensional ◽  
Temperature Dependent ◽  
Dirac Semimetal

scholarly journals Three-Dimensional Dirac Semimetal/Organic Thin Film Heterojunction Photodetector With Fast Response and High Detectivity

2021 ◽  
Vol 9 ◽  
Author(s):  
Qi Liu ◽  
Ming Yang ◽  
Jiangwei Zhang ◽  
Mingliang Yang ◽  
Jun Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
High Performance ◽  
Three Dimensional ◽  
Fast Response ◽  
Current Response ◽  
Organic Thin Film ◽  
Small Current ◽  
Dirac Semimetal ◽  
High Level ◽  
P Type

As a typical three-dimensional Dirac semimetal (3D DSM), Cd3As2 possess ultrahigh carrier mobility, high level of full spectral absorption, fast electron transmission speed, and high photocurrent response, which enable wide applications in infrared photodetector. However, the large dark current of the detector based on Cd3As2 thin film limits the application of the small current response. Hence, we demonstrated heterojunction photodetectors based on n-type 3D DSM Cd3As2 (pristine and Zn doped) and p-type organic (PbPc) by depositing PbPc thin film on Cd3As2 (pristine and Zn doped) thin film using thermal deposition method. These photodetectors can detect the radiation wavelength from 405 to 1,550 nm at room temperature. It is remarkable that this thin film heterojunction photodetector exhibits high detectivity (3.95 × 1011 Jones) and fast response time (160 μs) under bias voltage, which is significantly improved vs. that of Cd3As2-based devices. The excellent performances are attributed to the strong built-in electric field at the interface of p-n junction, which is beneficial for efficient photocarriers collection and transportation. These results show that DSM/organic thin film heterojunction has excellent performance in the application of photodetectors. By combining 3D DSM with organic to form heterojunction, it provides a feasible solution for high-performance photodetectors.

Three-dimensional Dirac semimetal thin-film absorber for broadband pulse generation in the near-infrared

2018 ◽  
Vol 43 (7) ◽  
pp. 1503 ◽  
Author(s):  
Yafei Meng ◽  
Chunhui Zhu ◽  
Yao Li ◽  
Xiang Yuan ◽  
Faxian Xiu ◽  
...  
Keyword(s):  
Thin Film ◽  
Near Infrared ◽  
Three Dimensional ◽  
Pulse Generation ◽  
Dirac Semimetal ◽  
Broadband Pulse

Temperature-dependent circular conversion dichroism from the chiral metasurfaces patterned in Dirac semimetal Cd3As2

2021 ◽  
Author(s):  
Guangyi Jia ◽  
Zhen Xian Huang ◽  
Yan Zhou ◽  
Huaiwen Wang ◽  
Yongliang Zhang ◽  
...  
Keyword(s):  
Thin Film ◽  
Temperature Dependent ◽  
Dirac Semimetal ◽  
The Impact

Chiral metasurfaces patterned with L-shaped holes in a thin film of Dirac semimetal Cd3As2 are designed. The impact of temperature T on circular conversion dichroism, mainly characterized by the circular...

Imaging of platinum-shadowed macromolecular complexes in dark field

1984 ◽  
Vol 42 ◽  
pp. 146-147
Author(s):  
D.W. Andrews ◽  
F.P. Ottensmeyer
Keyword(s):  
Thin Film ◽  
Three Dimensional ◽  
Average Diameter ◽  
Dark Field ◽  
Bright Field ◽  
Field Mode ◽  
Macromolecular Complexes ◽  
Average Mass ◽  
Topological Features ◽  
Projection Images

Shadowing with heavy metals has been used for many years to enhance the topological features of biological macromolecular complexes. The three dimensional features present in directionaly shadowed specimens often simplifies interpretation of projection images provided by other techniques. One difficulty with the method is the relatively large amount of metal used to achieve sufficient contrast in bright field images. Thick shadow films are undesirable because they decrease resolution due to an increased tendency for microcrystalline aggregates to form, because decoration artefacts become more severe and increased cap thickness makes estimation of dimensions more uncertain.The large increase in contrast provided by the dark field mode of imaging allows the use of shadow replicas with a much lower average mass thickness. To form the images in Fig. 1, latex spheres of 0.087 μ average diameter were unidirectionally shadowed with platinum carbon (Pt-C) and a thin film of carbon was indirectly evaporated on the specimen as a support.

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