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Photodetectors based on two-dimensional (2D) materials have great potential applications in the field of new energy, such as fuel cells, solar cells, and other fields. Van der Waals (vdW) heterojunction photodiodes are expected to be one of the promising applications of two-dimensional materials due to the photoelectric properties without consideration of lattice mismatch. High-efficiency photoelectric sensors based on two-dimensional materials have great significance to reducing the energy consumption of devices. Here, we build a complex vdW heterostructure by combining InS0.3Se0.7 with another suitable 2D material WS2. Few-layer graphite was used as electrodes to enhance the optoelectronic performance of indium monochalcogenides. Evident photocurrent is observed in the InS0.3Se0.7/WS2 vdW heterostructure device arising from the formed p–n junction at the interface. The uniformity and photoresponse of the InS0.3Se0.7/WS2 vdW heterostructure has been further investigated by the photocurrent mapping. It shows that the entire photovoltaic current was originated from the InS0.3Se0.7/WS2 vdW heterojunction by scanning photocurrent microscope images. Furthermore, the response speed is enhanced at small bias voltage. The transient photoresponse can be well reproduced in almost 100 cycles, indicating the good repeatable optoelectronic performance. Our study indicates that the as-prepared InS0.3Se0.7/WS2 vdW heterostructures are attractive building blocks for photodetectors application. Our findings will open up a new way to further develop high-performance, low-power, and energy-efficient photodetectors based on indium monochalcogenides.
Kaiting Zhang; Jie Chang; Chaoyang Tan; Hui Han. Low-Powered Photodetector Based on Two-Dimensional InS0.3Se0.7/WS2 Heterostructure. Sustainability 2021, 13, 6883 .
AMA StyleKaiting Zhang, Jie Chang, Chaoyang Tan, Hui Han. Low-Powered Photodetector Based on Two-Dimensional InS0.3Se0.7/WS2 Heterostructure. Sustainability. 2021; 13 (12):6883.
Chicago/Turabian StyleKaiting Zhang; Jie Chang; Chaoyang Tan; Hui Han. 2021. "Low-Powered Photodetector Based on Two-Dimensional InS0.3Se0.7/WS2 Heterostructure." Sustainability 13, no. 12: 6883.
We conducted a study of critical exponents to investigate the nature of paramagnetic to ferromagnetic phase transition in a La\(_{\mathrm{0.67}}\)Ba\(_{\mathrm{0.33}}\)MnO\(_{\mathrm{3}}\) (LBMO) film deposited on SrTiO\(_{\mathrm{3}}\). To this end, we performed dc magnetization M (H, T) measurements around the Curie temperature (\(T_{\mathrm{C}}\sim \) 276.5 K) within a temperature range that includes the critical region \(|\varepsilon |\) \(=\) \(|T-T_{\mathrm{C}}|\)/\(T_{\mathrm{C}} < 0.05\). We found that the transition is a second-order transition. Three main critical exponents, namely \(\beta \) (0.387), \(\gamma \) (1.309) and \(\delta \) (4.634), and the critical temperature \(T_{\mathrm{C}} =\) 276.6 K are derived from the modified Arrott plots. These exponents obey the Widom relation \(\delta =\) 1\(+\gamma \)/\(\beta \) and are able to collapse a bunch of isothermal magnetization data into two branches below and above \(T_{\mathrm{C}}\) based on the single scaling equation M(\({H, \varepsilon }\))\(\varepsilon ^{-\beta } = {f}_{\pm }({H} \varepsilon ^{({-\beta +\gamma })})\). The critical behavior in LBMO film is close to a 3D Heisenberg model, although certain long-range interactions still exist. Compared to a polycrystalline bulk sample, the long-range interactions are greatly suppressed, which may be attributed to the reduced dimensionality.
Shirui Weng; Changjin Zhang; Hui Han. 3D-Heisenberg ferromagnetic characteristics in a La$$_{0.67}$$Ba$$_{0.33}$$MnO$$_{3}$$ film on SrTiO$$_{3}$$. The European Physical Journal B 2021, 94, 1 -6.
AMA StyleShirui Weng, Changjin Zhang, Hui Han. 3D-Heisenberg ferromagnetic characteristics in a La$$_{0.67}$$Ba$$_{0.33}$$MnO$$_{3}$$ film on SrTiO$$_{3}$$. The European Physical Journal B. 2021; 94 (4):1-6.
Chicago/Turabian StyleShirui Weng; Changjin Zhang; Hui Han. 2021. "3D-Heisenberg ferromagnetic characteristics in a La$$_{0.67}$$Ba$$_{0.33}$$MnO$$_{3}$$ film on SrTiO$$_{3}$$." The European Physical Journal B 94, no. 4: 1-6.