Read by QxMD icon Read


Yuntian Chen, Yan Zhang, A Femius Koenderink
We study semi-analytically the light emission and absorption properties of arbitrary stratified photonic structures with embedded two-dimensional magnetoelectric point scattering lattices, as used in recent plasmon-enhanced LEDs and solar cells. By employing dyadic Green's function for the layered structure in combination with the Ewald lattice summation to deal with the particle lattice, we develop an efficient method to study the coupling between planar 2D scattering lattices of plasmonic, or metamaterial point particles, coupled to layered structures...
September 4, 2017: Optics Express
Yunwon Song, Keorock Choi, Dong-Hwan Jun, Jungwoo Oh
GaAs solar cells with nanostructured emitter layers were fabricated via metal-assisted chemical etching. Au nanoparticles produced via thermal treatment of Au thin films were used as etch catalysts to texture an emitter surface with nanohole structures. Epi-wafers with emitter layers 0.5, 1.0, and 1.5 um in thickness were directly textured and a window layer removal process was performed before metal catalyst deposition. A nanohole-textured emitter layer provides effective light trapping capabilities, reducing the surface reflection of a textured solar cell by 11...
October 2, 2017: Optics Express
Enas Sakr, Peter Bermel
Deliberate control of thermal emission properties using nanophotonics has improved a number of applications including thermophotovoltaics (TPV), radiative cooling and infrared spectroscopy. In this work, we study the effect of simultaneous control of angular and spectral properties of thermal emitters on the efficiencies of TPV systems. While spectral selectivity reduces sub-bandgap losses, angular selectivity is expected to enhance view factors at larger separation distances and hence to provide flexibilities in cooling the photovoltaic converter...
October 2, 2017: Optics Express
A I Yakimov, V V Kirienko, A A Bloshkin, V A Armbrister, A V Dvurechenskii, J-M Hartmann
We report the fabrication and characterization of a multilayer Ge quantum dot detector grown on Si1-xGex virtual substrate (x = 0.18) for photovoltaic mid-wave infrared photodetection. Detector displays an over 100% photovoltaic response enhancement as compared to a conventional Ge/Si device due to smaller hole effective mass in the SiGe barriers. A further enhancement in sensitivity is achieved by excitation of surface plasmon polariton waves in a Ge/SiGe photodetector coupled with a two-dimensional plasmonic structure...
October 16, 2017: Optics Express
Han Wang, Hao Wu, Zhiyuan Shen
We demonstrate the nonreciprocal optical phenomenon of SiC gratings on substrate in infrared band, in which the Lorentz-Drude equations of dielectric constant tensor are proposed to describe the nonreciprocal optical properties as magnetic field applied on the magneto-optical materials, under variable intensity and wavelength. Moreover, the properly designed geometrical factors are proposed, and the good nonreciprocal absorption properties of SiC in thermal radiation wavelength band are presented. The dependence of the absorptivity as a function of different structure parameters, such as thickness of different layers, filling ratios, is studied in details...
August 7, 2017: Optics Express
Shuang Qiao, Jihong Liu, ZhiQiang Li, ShuFang Wang, GuangSheng Fu
As an interesting one dimensional ribbon material, Sb2S3 has recently attracted much attention in recent years due to its exciting optical properties. However, Sb2S3-based photovoltaic or photoelectronic devices are still in research, and there are many things unknown to us and need to be well studied. In this work, the glass/FTO/CdS/Sb2S3/Au structures were successfully prepared with different Sb2S3 thicknesses, and the lateral photovoltaic effect (LPE) was firstly observed in this structure, suggesting its great potential in position sensitivity detectors (PSD)...
August 7, 2017: Optics Express
Jared Tippens, Abhijeet Bagal, Xu A Zhang, Chih-Hao Chang
In this work, we demonstrate a two-dimensional nano-hole array that can reduce reflection losses while passively trapping and harvesting incident light. The surface structure is designed to scavenge a small portion of incident light that would typically be lost due to Fresnel reflection, while the majority of light transmits unobstructed like a regular window. The trapping mechanism is dependent on angle and wavelength, and can be designed to selectively trap narrow wavelength bands using the constructed theoretical models...
August 7, 2017: Optics Express
Yang Chen, Oliver Höhn, Nico Tucher, Mats-Erik Pistol, Nicklas Anttu
A tandem solar cell consisting of a III-V nanowire subcell on top of a planar Si subcell is a promising candidate for next generation photovoltaics due to the potential for high efficiency. However, for success with such applications, the geometry of the system must be optimized for absorption of sunlight. Here, we consider this absorption through optics modeling. Similarly, as for a bulk dual-junction tandem system on a silicon bottom cell, a bandgap of approximately 1.7 eV is optimum for the nanowire top cell...
August 7, 2017: Optics Express
Souichi Sakamoto, Yoshitaka Tanimura
We theoretically investigate an exciton-coupled electron transfer (XCET) process that is conversion of an exciton into a charge transfer state. This conversion happens in an exciton transfer (XT) process, and the electron moves away in an electron transfer(ET) process in multiple environments (baths). This XCET process plays an essential role in the harvesting of solar energy in biological and photovoltaic materials. We develop a practical theoretical model to study the efficiency of XCET process that occurs either in consecutive or concerted processes under the influence of non-Markovian baths...
October 17, 2017: Journal of Physical Chemistry Letters
Hong-Yan Chen, Hong-Liang Lu, Jin-Xin Chen, Feng Zhang, Xin-Ming Ji, Wen-Jun Liu, Xiao-Feng Yang, David Wei Zhang
The AlON film with homogenous nitrogen doping profile was grown by plasma enhanced atomic layer deposition (PEALD) at low temperature. In this work, the precursors of the NH3 and the O2 were simultaneously introduced into the chamber during the PEALD growth at a relatively low temperature of 185 oC. It is found that the composition of the obtained film quickly changes from AlN to Al2O3 when a small amount of O2 is added. Thus, the NH3:O2 ratio should be maintained at a relatively high level (>85 %) for realizing the AlON growth...
October 17, 2017: ACS Applied Materials & Interfaces
James Z Fan, Mengxia Liu, Oleksandr Voznyy, Bin Sun, Larissa Levina, Rafael Quintero-Bermudez, Min Liu, Olivier Ouellette, F Pelayo Garcia de Arquer, Sjoerd Hoogland, Edward H Sargent
Colloidal quantum dots are promising materials for tandem solar cells that complement to silicon and perovskites. These devices are fabricated from solution phase; however, existing methods for making infrared-bandgap CQD inks suffer agglomeration and fusion during solution exchange. Here we develop a ligand exchange that provides robust surface protection and thereby avoids aggregation. First, we exchanged long oleic acid ligands to a mixed system comprised of medium-chain ammonium and anionic chloride ligands; then, we re-shelled the surface using short halides and pseudohalide ligands that enabled transfer to a polar solvent...
October 17, 2017: ACS Applied Materials & Interfaces
Guoqing Zhao, Myungkwan Song, Hee-Suk Chung, Soo Min Kim, Sang-Geul Lee, Jong-Seong Bae, Tae Sung Bae, Donghwan Kim, Gun-Hwan Lee, Seung Zeon Han, Hae-Seok Lee, Eun-Ae Choi, Jungheum Yun
The development of highly efficient flexible transparent conducting electrodes (FTCEs) supported on polymer substrates is of great importance to the realization of portable and bendable photovoltaic devices. Highly conductive, low-cost Cu has attracted attention as a promising alternative for replacing expensive indium tin oxide (ITO) and Ag. However, highly efficient, Cu-based FTCEs are currently unavailable because of the absence of an efficient means of attaining an atomically thin, completely continuous Cu film that simultaneously exhibits enhanced optical transmittance and electrical conductivity...
October 17, 2017: ACS Applied Materials & Interfaces
Shuang Shi, Pengting Li, Jianxiong Meng, Dachuan Jiang, Yi Tan, H M Noor Ul Huda Khan Asghar
A full domain control model is established for impurity transportation in the liquid phase, gas-liquid interface and gas phase of silicon to analyze the dynamic mechanics of impurity removal. The results show that the overall mass transfer coefficient mainly depends on the temperature and the chamber pressure. Its value increases with the increase of temperature or the decrease of chamber pressure. Under the same melting condition, the order of the overall mass transfer coefficients for P, Al and Ca is kP > kAl > kCa, indicating that P is easier to remove by evaporation...
October 17, 2017: Physical Chemistry Chemical Physics: PCCP
R Skonieczny, J Makowiecki, B Bursa, A Krzykowski, M Szybowicz
The titanyl phthalocyanine (TiOPc) thin film deposited on glass, silicon and gold substrate have been studied using Raman spectroscopy, atomic force microscopy (AFM), absorption and profilometry measurements. The TiOPc thin layers have been deposited at room temperature by the quasi-molecular beam evaporation technique. The Raman spectra have been recorded using micro Raman system equipped with a confocal microscope. Using surface Raman mapping techni que with polarized Raman spectra the polymorphic forms of the TiOPc thin films distribution have been obtained...
October 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Zhaozhao Wang, Linfa Peng, Zhongqin Lin, Jun Ni, Peiyun Yi, Xinmin Lai, Xiaolong He, Zeyu Lei
Mechanical flexibility and advanced light management have gained great attentions in designing high performance, flexible thin film photovoltaics for the realization of building-integrated optoelectronic devices and portable energy sources. This study develops a soft thermal nanoimprint process for fabricating nanostructure decorated substrates integrated with amorphous silicon solar cells. Amorphous silicon (a-Si:H) solar cells have been constructed on nanoholes array textured polyimide (PI) substrates. It has been demonstrated that the nanostructures not only are beneficial to the mechanical flexibility improvement but also contribute to sunlight harvesting enhancement...
October 13, 2017: Scientific Reports
Joel S Miller, Eric Campbell, Brandon Dick, Arnold Rheingold, Chuang Zhang, Xiaojie Liu, Zeev Vardeny
Photovoltaic Perovskites, most notably methylammonium lead triiodide, (NH3Me)PbI3, have recently attracted considerable attention, and based upon the 'Goldschmidt Tolerance Factor' hydrazinium should be able to occupy the same cation site as methylammonium. The reaction of N2H5+I- with PbI2 in DMF results in three types of yellow crystals; hexagonal, needle-like, and rod-like, whose structures were determined at 100 K. The hexagonal [P63/m: a = 10.8906(10) Å; b = 37.845(5) Å] crystals possess isolated face sharing octahedral [Pb2I9]5-, [PbI6]4-, and I- ions...
October 13, 2017: Chemistry: a European Journal
Yang Fan, Hua-Min Li, Rui-Huan Duan, Hai-Ting Lu, Jun-Tao Cao, Guo-Dong Zou, Qiang-Shan Jing
The metal-to-core charge transfer (MCCT) transition in sensitized titanium-oxo clusters is an important process for photoinduced electron injection in photovoltaic conversion. This process resembles most closely the Type II photoinjection in dye-sensitized solar cells. Herein we report the synthesis and photophysical and photoelectrochemical (PEC) properties of the phosphonate-stabilized titanium-oxo clusters containing the ferrocenecarboxylate ligands. These ferrocene-containing clusters exhibit intense visible absorption extended up to 600 nm along with low optical band gaps of ∼2...
October 13, 2017: Inorganic Chemistry
Martin Pumera
Much research effort has been put in to study layered compounds with transition metal dichalcogenides (TMDs) being one of the most studied compounds. Due to their extraordinary properties such as excellent electrochemical properties, tuneable band gaps and low shear resistance due to weak van der Waals interactions between layers, TMDs have been found to have a wide application such as electrocatalyst for hydrogen evolution reactions, supercapacitors, biosensors, field-effect transistors (FETs), photovoltaic and lubricant additives...
October 13, 2017: Chemistry: a European Journal
Qiyun Tang, Paula C Angelomé, Galo J A A Soler-Illia, Marcus Müller
Ordered mesostructured TiO2 thin films are employed in diverse applications ranging from catalysis and sensing, to photovoltaic and lithium-ion batteries. Experimentally these mesostructured thin films are fabricated via a sol-gel process coupled with evaporation-induced self-assembly of a supramolecular template, where the concentration of hydrogen chloride (HCl) and water play vital roles. We employ a soft, coarse-grained model of the amphiphilic template Brij58 and spherical particles, representing titanium-oxo clusters, to study the role of HCl and water in the formation of mesostructured TiO2 thin films...
October 13, 2017: Physical Chemistry Chemical Physics: PCCP
Xin Chen
Open-circuit photovoltage (Voc) is among critical parameters for achieving an efficient light-to-charge conversion in existing solar photovoltaic devices. Natural photosynthesis exploits light-harvesting chlorophyll (Chl) protein complexes to transfer sunlight energy efficiently. We describe the exploitation of photosynthetic fucoxanthin-chlorophyll protein (FCP) complexes for realizing photoelectrochemical cells with a high Voc. An antenna-dependent photocurrent response and a Voc up to 0.72V are observed and demonstrated in the bio-photovoltaic devices fabricated with photosynthetic FCP complexes and TiO2 nanostructures...
October 11, 2017: Chemistry, An Asian Journal
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"