scholarly journals The Highly Uniform Photoresponsivity from Visible to Near IR Light in Sb2Te3 Flakes

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1535
Author(s):  
Shiu-Ming Huang ◽  
Jai-Lung Hung ◽  
Mitch Chou ◽  
Chi-Yang Chen ◽  
Fang-Chen Liu ◽  
...  

Broadband photosensors have been widely studied in various kinds of materials. Experimental results have revealed strong wavelength-dependent photoresponses in all previous reports. This limits the potential application of broadband photosensors. Therefore, finding a wavelength-insensitive photosensor is imperative in this application. Photocurrent measurements were performed in Sb2Te3 flakes at various wavelengths ranging from visible to near IR light. The measured photocurrent change was insensitive to wavelengths from 300 to 1000 nm. The observed wavelength response deviation was lower than that in all previous reports. Our results show that the corresponding energies of these photocurrent peaks are consistent with the energy difference of the density of state peaks between conduction and valence bands. This suggests that the observed photocurrent originates from these band structure peak transitions under light illumination. Contrary to the most common explanation that observed broadband photocurrent carrier is mainly from the surface state in low-dimensional materials, our experimental result suggests that bulk state band structure is the main source of the observed photocurrent and dominates the broadband photocurrent.

Science ◽  
2016 ◽  
Vol 353 (6294) ◽  
pp. 62-67 ◽  
Author(s):  
Zhensheng Tao ◽  
Cong Chen ◽  
Tibor Szilvási ◽  
Mark Keller ◽  
Manos Mavrikakis ◽  
...  

Attosecond spectroscopic techniques have made it possible to measure differences in transport times for photoelectrons from localized core levels and delocalized valence bands in solids. We report the application of attosecond pulse trains to directly and unambiguously measure the difference in lifetimes between photoelectrons born into free electron–like states and those excited into unoccupied excited states in the band structure of nickel (111). An enormous increase in lifetime of 212 ± 30 attoseconds occurs when the final state coincides with a short-lived excited state. Moreover, a strong dependence of this lifetime on emission angle is directly related to the final-state band dispersion as a function of electron transverse momentum. This finding underscores the importance of the material band structure in determining photoelectron lifetimes and corresponding electron escape depths.


2016 ◽  
Vol 45 (23) ◽  
pp. 9497-9505 ◽  
Author(s):  
Lu Li ◽  
Mingyi Zhang ◽  
Zhenyu Zhao ◽  
Baodong Sun ◽  
Xitian Zhang

Tetranitrophthalocyanine iron/bismuth oxychloride organic–inorganic heterostructures exhibit high photocatalytic behavior for the decomposition of MO and BPA under visible/near-IR light illumination.


2021 ◽  
Vol 2021 (9) ◽  
pp. 831-839
Author(s):  
Vanitha Ramu ◽  
Paramita Kundu ◽  
Aarti Upadhyay ◽  
Paturu Kondaiah ◽  
Akhil R. Chakravarty

2019 ◽  
Vol 3 (3) ◽  
Author(s):  
Peter Mahler Larsen ◽  
Mohnish Pandey ◽  
Mikkel Strange ◽  
Karsten Wedel Jacobsen

Nanoscale ◽  
2021 ◽  
Author(s):  
Ivan Marri ◽  
Stefano Ossicini

An important challenge in the field of renewable energy is the development of novel nanostructured solar cell devices which implement low-dimensional materials to overcome the limits of traditional photovoltaic systems....


Nanoscale ◽  
2021 ◽  
Author(s):  
Z.Q. Zheng ◽  
Yuchen Zhou ◽  
Wei Gao ◽  
Li Zhang ◽  
Mengmeng Yang ◽  
...  

Heterojunctions based on low-dimensional materials can combine the superiorities of each composition and realize novel properties. Herein, a mixed-dimensional heterojunction comprising multilayer WS2, CdS microwire and few-layer WS2 has been...


2021 ◽  
Vol 33 (11) ◽  
pp. 2170079
Author(s):  
Mingze He ◽  
Sami I. Halimi ◽  
Thomas G. Folland ◽  
Sai S. Sunku ◽  
Song Liu ◽  
...  
Keyword(s):  
Near Ir ◽  

1964 ◽  
Vol 19 (5) ◽  
pp. 548-552
Author(s):  
Günther Harbeke

The absorption constant of germanium beyond the first direct absorption edge has been determined up to energies of 2.5 eV by transmission measurements on very thin samples prepared from bulk single crystals. The results are discussed in terms of recent band structure calculations and previous reflection measurements. At low temperatures the observed structure gives evidence for exciton formation connected with direct transitions at a saddle point in the energy difference between conduction and valence bands.


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