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Shuai Huang, Yunhe Wang, Si Shen, Yuting Tang, Ancan Yu, Bonan Kang, S Ravi P Silva, Geyu Lu
Polymer solar cells (PSCs) are considered promising energy power suppliers due to their light weight, printability, low-energy fabrication and roll-to-roll processability. Recently, the solution-processed NiOx nanoparticles have been a desirable interfacial material for hole transport in the PSCs, instead of organic semiconductors. However, pure NiOx films restrain the high performance of PSCs due to their poor electrical characteristics caused by the localized orbital distribution at the top of valence band...
October 6, 2018: Journal of Colloid and Interface Science
Yawen Zhang, Jiewen Fan, Qianqian Huang, Jiadi Zhu, Yang Zhao, Ming Li, Yanqing Wu, Ru Huang
Magneto-electronic logic is an innovative approach to performing high-efficiency computations. Additionally, the ultra-large scale integration requirement for computation strongly suggests exploiting magnetoresistance effects in non-magnetic semiconductor materials. Here, we demonstrate the magnetoresistance effect in a silicon nanowire field effect transistor (SNWT) fabricated by complementary metal-oxide-semiconductor (CMOS)-compatible technology. Our experimental results show that the sign and the magnitude of the magnetoresistance in SNWTs can be effectively controlled by the drain-source voltage and the gate-source voltage, respectively, playing the role of a multi-terminal tunable magnetoresistance device...
October 12, 2018: Scientific Reports
Yusuke Tsujiie, Yoshiyuki Kawamura
The Fabry-Pérot interferometer is used in a variety of high-precision optical interferometry applications, such as gravitational wave detection. It is also used in various types of laser resonators to act as a narrow band filter. In addition, ultra-compact Fabry-Pérot interferometers are used in the optical resonators of semiconductor lasers and fiber-optic systems. In this work, we developed a micro-scale Fabry-Pérot interferometer that was constructed within the Rayleigh range of the optical focusing system...
October 12, 2018: Scientific Reports
Xiaolin Cai, Zhili Zhu, Weiyang Yu, Chunyao Niu, Jianjun Wang, Baoji Wang, Xiaohua Li, Liwei Zhang, Ruiqi Zhao, Yu Jia
On the basis of density functional theory (DFT) calculations, we propose a stable two-dimensional (2D) monolayer phosphorus carbide (PC) with a GaSe-like structure, which has intriguing electronic and optical properties. Our calculated results show that this 2D monolayer structure is more stable than the other allotropes predicted by Tománek et al. [ Nano Lett., 2016, 16, 3247⁻3252 ]. More importantly, this structure exhibits superb optical absorption, which can be mainly attributed to its direct band gap of 2...
October 11, 2018: Materials
Donghai Wu, Shuaiwei Wang, Shouren Zhang, Yibiao Liu, Yingchun Ding, Baocheng Yang, Houyang Chen
Silicon-based two-dimensional (2D) materials have unique properties and extraordinary engineering applications. However, penta-silicene is unstable. Herein, by employing first-principles calculations, we provide a facile surface chemistry method, i.e. functionalization, to acquire and reconfigure stable penta-silicene for use in flexible lithium-ion batteries. Our results of density functional theory calculations showed that the reconfigured penta-silicene nanosheets possess a broad range of properties, including semiconductors with an indirect bandgap, semiconductors with a direct bandgap, semimetals and metals...
October 12, 2018: Physical Chemistry Chemical Physics: PCCP
Ying Xie, Fei Liang, Dong Wang, Chumeng Chi, Haohai Yu, Zheshuai Lin, Huaijin Zhang, Yanxue Chen, Jiyang Wang, Yicheng Wu
Photodetection using semiconductors is critical for capture, identification, and processing of optical information. Nowadays, broadband photodetection is limited by the underdeveloped mid-IR photodetection at room temperature (RT), primarily as a result of the large dark currents unavoidably generated by the Fermi-Dirac distribution in narrow-bandgap semiconductors, which constrains the development of some modern technologies and systems. Here, an electronic-structure strategy is proposed for designing ultrabroadband covering mid- and even far-IR photodetection materials operating at RT and a layered MoS2 is manifested with an engineered bandgap of 0...
October 11, 2018: Advanced Materials
Muhammad Ismail, Ijaz Talib, Anwar Manzoor Rana, Tahira Akbar, Shazia Jabeen, Jinju Lee, Sungjun Kim
Memory devices with bilayer CeO2-x /ZnO and ZnO/CeO2-x heterostructures sandwiched between Ti top and Pt bottom electrodes were fabricated by RF-magnetron sputtering at room temperature. N-type semiconductor materials were used in both device heterostructures, but interestingly, change in heterostructure and electroforming polarity caused significant variations in resistive switching (RS) properties. Results have revealed that the electroforming polarity has great influence on both CeO2-x /ZnO and ZnO/CeO2-x heterostructure performance such as electroforming voltage, good switching cycle-to-cycle endurance (~ 102 ), and ON/OFF ratio...
October 11, 2018: Nanoscale Research Letters
Bastian Trepka, Julian Stiegeler, Ilona Wimmer, Mikhail Fonin, Sebastian Polarz
EuO is unique, because it belongs to the few solids combining semiconducting properties (Egap = 1.1 eV) with native ferromagnetism. For future applications of EuO, e.g. as spin-filters or for sensors, one has to learn how defined nanostructures can be prepared. Unlike other ceramic oxides, there are no established soft-chemistry routes (e.g. sol-gel) towards EuO nanomaterials e.g. porous materials. This is due to the labile nature of the oxidation state Eu(+ii). We present a particle-based method leading to a EuO aerogel...
October 12, 2018: Nanoscale
G Walters, M Wei, O Voznyy, R Quintero-Bermudez, A Kiani, D-M Smilgies, R Munir, A Amassian, S Hoogland, E Sargent
The quantum-confined Stark effect (QCSE) is an established optical modulation mechanism, yet top-performing modulators harnessing it rely on costly fabrication processes. Here, we present large modulation amplitudes for solution-processed layered hybrid perovskites and a modulation mechanism related to the orientational polarizability of dipolar cations confined within these self-assembled quantum wells. We report an anomalous (blue-shifting) QCSE for layers that contain methylammonium cations, in contrast with cesium-containing layers that show normal (red-shifting) behavior...
October 11, 2018: Nature Communications
Katalin Majrik, Zoltán Pászti, László Korecz, László Trif, Attila Domján, Giuseppe Bonura, Catia Cannilla, Francesco Frusteri, András Tompos, Emília Tálas
In this study, relationships between preparation conditions, structure, and activity of Pt-containing TiO₂ photocatalysts in photoinduced reforming of glycerol for H₂ production were explored. Commercial Aerolyst® TiO₂ (P25) and homemade TiO₂ prepared by precipitation-aging method were used as semiconductors. Pt co-catalysts were prepared by incipient wetness impregnation from aqueous solution of Pt(NH₃)₄(NO₃)₂ and activated by calcination, high temperature hydrogen, or nitrogen treatments...
October 10, 2018: Materials
M V López-Ramón, J Rivera-Utrilla, M Sánchez-Polo, A M S Polo, Antonio J Mota, F Orellana-García, M A Álvarez
In this study, a nickel organic xerogel (X-Ni) was used as semiconductor photocatalyst for the degradation of the herbicide diuron (DRN) in aqueous solution. The main objective of this work was to analyze and compare the effectiveness of solar irradiation to remove DRN from water both by direct photolysis and photocatalytic degradation. We examined the influence of the initial concentration of the herbicide, the solution pH, the presence of different ions in the medium, the chemical composition of the water, and the presence of a photocatalyst, after 240 min of irradiation...
February 10, 2019: Science of the Total Environment
Yohan Kim, Benjamin Heyne, Ahed Abouserie, Christopher Pries, Christian Ippen, Christina Günter, Andreas Taubert, Armin Wedel
Hexagonal p-type semiconductor CuS nanoplates were synthesized via a hot injection method from bis(trimethylsilyl)sulfide and the ionic liquid precursor bis( N -dodecylpyridinium) tetrachloridocuprate(ii). The particles have a broad size distribution with diameters between 30 and 680 nm and well-developed crystal habits. The nanoplates were successfully incorporated into organic photovoltaic (OPV) cells as hole conduction materials. The power conversion efficiency of OPV cells fabricated with the nanoplates is 16% higher than that of a control device fabricated without the nanoplates...
May 21, 2018: Journal of Chemical Physics
Chaojun Li, Xiaofeng Liu, Jianrong Qiu
Organic semiconductors, such as polycyclic aromatic hydrocarbons, are typically not responsive to near infrared (NIR) light due to their relatively large bandgaps. Here, we show that the NIR light at 980 nm can be efficiently converted to broadband visible upconversion (UC) emission by rubrene molecules in a solution dispersed with upconversion nanoparticles (UCNPs). Spectroscopic characterizations indicate that the sensitization of emission by rubrene molecules strongly depends on the location of the 4f levels of Er3+ ions and the interplay between reabsorption and Förster-type energy transfer...
October 11, 2018: Physical Chemistry Chemical Physics: PCCP
Hao Zhong, Nasir Ilyas, Yuhao Song, Wei Li, Yadong Jiang
Silicon is widely used in semiconductor industry but has poor performance in near-infrared photoelectronic devices because of its high reflectance and band gap limit. In this study, two-step process, deep reactive ion etching (DRIE) method combined with plasma immersion ion implantation (PIII), are used to fabricate microstructured black silicon on the surface of C-Si. These improved surfaces doped with sulfur elements realize a narrower band gap and an enhancement of light absorptance, especially in the near-infrared range (800 to 2000 nm)...
October 10, 2018: Nanoscale Research Letters
Kebin Lin, Jun Xing, Li Na Quan, F Pelayo García de Arquer, Xiwen Gong, Jianxun Lu, Liqiang Xie, Weijie Zhao, Di Zhang, Chuanzhong Yan, Wenqiang Li, Xinyi Liu, Yan Lu, Jeffrey Kirman, Edward H Sargent, Qihua Xiong, Zhanhua Wei
Metal halide perovskite materials are an emerging class of solution-processable semiconductors with considerable potential for use in optoelectronic devices1-3 . For example, light-emitting diodes (LEDs) based on these materials could see application in flat-panel displays and solid-state lighting, owing to their potential to be made at low cost via facile solution processing, and could provide tunable colours and narrow emission line widths at high photoluminescence quantum yields4-8 . However, the highest reported external quantum efficiencies of green- and red-light-emitting perovskite LEDs are around 14 per cent7,9 and 12 per cent8 , respectively-still well behind the performance of organic LEDs10-12 and inorganic quantum dot LEDs13 ...
October 2018: Nature
Mingjie Li, Raihana Begum, Jianhui Fu, Qiang Xu, Teck Ming Koh, Sjoerd A Veldhuis, Michael Grätzel, Nripan Mathews, Subodh Mhaisalkar, Tze Chien Sum
Multiple exciton generation (MEG) or carrier multiplication, a process that spawns two or more electron-hole pairs from an absorbed high-energy photon (larger than two times bandgap energy Eg ), is a promising way to augment the photocurrent and overcome the Shockley-Queisser limit. Conventional semiconductor nanocrystals, the forerunners, face severe challenges from fast hot-carrier cooling. Perovskite nanocrystals possess an intrinsic phonon bottleneck that prolongs slow hot-carrier cooling, transcending these limitations...
October 10, 2018: Nature Communications
Saghi Forouhi, Rasoul Dehghani, Ebrahim Ghafar-Zadeh
This paper proposes a novel charge-based Complementary Metal Oxide Semiconductor (CMOS) capacitive sensor for life science applications. Charge-based capacitance measurement (CBCM) has significantly attracted the attention of researchers for the design and implementation of high-precision CMOS capacitive biosensors. A conventional core-CBCM capacitive sensor consists of a capacitance-to-voltage converter (CVC), followed by a voltage-to-digital converter. In spite of their high accuracy and low complexity, their input dynamic range (IDR) limits the advantages of core-CBCM capacitive sensors for most biological applications, including cellular monitoring...
October 9, 2018: Sensors
Ahmad A Darweesh, Stephen J Bauman, Desalegn T Debu, Joseph B Herzog
We propose and report on the design of a 1-D metallo-dielectric nano-grating on a GaAs substrate. We numerically study the impact of grating period, slit and wire widths, and irradiating angle of incidence on the optical response. The optimal wire width, w = 160 nm, was chosen based on previous results from investigations into the influence of wire width and nano-slit dimensions on optical and electrical enhancements in metal-semiconductor-metal photodetectors. In this present project, resonant absorption and reflection modes were observed while varying the wire and nano-slit widths to study the unique optical modes generated by Rayleigh-Wood anomalies and surface plasmon polaritons...
October 9, 2018: Nanomaterials
Dinh Hoa Luong, Hyun Seok Lee, Ganesh Ghimire, Jubok Lee, Hyun Kim, Seok Joon Yun, Gwang Hwi An, Young Hee Lee
Two-dimensional (2D) transition-metal dichalcogenide (TMD) monolayers of versatile material library are spotlighted for numerous unexplored research fields. While monolayer TMDs exhibit an efficient excitonic emission, the weak light absorption arising from their low dimensionality limits potential applications. To enhance the light-matter interactions of TMDs, while various plasmonic hybridization methods have been intensively studied, controlling plasmonic nanostructures via self-assembly processes remains challenging...
October 10, 2018: Small
Daekyoung Yoo, Youngrok Kim, Misook Min, Geun Ho Ahn, Der-Hsien Lien, Jingon Jang, Hyunhak Jeong, Younggul Song, Seungjun Chung, Ali Javey, Takhee Lee
One of the long-standing problems in the field of organic electronics is their instability in the open environment, especially poor water-resistance. For reliable operation of organic devices, introducing an effective protection layer using organo-compatible materials and processes is highly desirable. Here, we report a facile method to deposit an organo-compatible superhydrophobic protection layer on organic semiconductors under ambient conditions. The protection layer exhibiting excellent water-repellency and self-cleaning abilities was deposited onto organic semiconductors directly by using a dip-coating process in a highly fluorinated solution with fluoroalkylsilane-coated titanium-dioxide (TiO2 ) nanoparticles...
October 10, 2018: ACS Nano
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