Crystal growth, structural phase transitions and optical gap evolution of FAPb(Br1-x Cl x )3 hybrid perovskites (FA: formamidinium ion, CH(NH2)2 +) by Carlos A. López, Oscar Fabelo, Carmen Abia, María T. Fernández-Diaz, José A. Alonso

“…FAPbBr3 and FAPbCl3 experience successive phase transitions upon cooling, lowering the symmetry from cubic to orthorhombic phases; however, these transitions are not observed for the mixed halide phases, probably due to compositional disorder. The band-gap engineering brought about by the chemical doping of FAPb (Br1-x Cl x )3 perovskites (x = 0.0, 0.33, 0.5, 0.66 and 1.0) can be controllably tuned: the gap progressively increases with the concentration of Cl− ions from 2.17 to 2.91 eV at room temperature, presenting a nonlinear behavior. …”
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Nanoscaled Electrocatalytic Optically Modulated ZnO Nanoparticles through Green Process of Punica granatum L. and Their Antibacterial Activities by Xolile Fuku, Abdoulaye Diallo, Malik Maaza

“…Electrochemical investigation revealed the redox properties and the conductivity of the as-prepared ZnO nanoparticles. The optical band gap of ZnO NPs was calculated to be 3.48 eV which indicates that ZnO NPs can be used in metal oxide semiconductor-based devices. …”
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Hydrothermal Synthesis of Iodine-Doped Nanoplates with Enhanced Visible and Ultraviolet-Induced Photocatalytic Activities by Jiang Zhang, Zheng-Hong Huang, Yong Xu, Feiyu Kang

“…The enhanced photocatalytic activity of I-BWO for degradation of RhB was caused by the synergetic effect of a small crystalline size, a narrow band gap, and plenty of oxygen vacancies.…”
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Photocatalytical Properties and Theoretical Analysis of N, Cd-Codoped TiO2 Synthesized by Thermal Decomposition Method by Hongtao Gao, Bing Lu, Fangfang Liu, Yuanyuan Liu, Xian Zhao

“…Due to dopants, the band gap of N, Cd-codoped TiO2 became narrow. The electronic transition from the valence band to conduction band became easy, which could account for the observed photocatalytic performance of N, Cd-codoped TiO2. …”
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Photo-Oxidation of Water Using Nanocrystalline Tungsten Oxide under Visible Light by J. W. J. Hamilton, J. A. Byrne, P. S. M. Dunlop, N. M. D. Brown

“…Few of the materials with a band gap suitable for visible light activation have the necessary band-edge potentials or photochemical stability to be suitable candidates. …”
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Using Flexible Polyimide as a Substrate to Deposit ZnO:Ga Thin Films and Fabricate p-i-n α-Si:H Thin-Film Solar Cells by Fang-Hsing Wang, Cheng-Fu Yang, Min-Chu Liu

“…The value variations in the films’ optical band gap (Eg) of the GZO thin films were evaluated from plots of  (αhν)2=c(hν-Eg), revealing that the measured Eg values increased with increasing deposition temperature. …”
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Synthesis and Characterization of Mn–C–Codoped TiO2 Nanoparticles and Photocatalytic Degradation of Methyl Orange Dye under Sunlight Irradiation by Wei Xin, Duanwei Zhu, Guanglong Liu, Yumei Hua, Wenbing Zhou

“…The results showed that Mn–C–TiO2 nanoparticles have higher activity than other samples under sunlight, which could be attributed to the high specific surface area, smaller particle size, and lower band gap energy.…”
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Characterization of Nanocrystalline SiGe Thin Film Solar Cell with Double Graded-Dead Absorption Layer by Chao-Chun Wang, Dong-Sing Wuu, Shui-Yang Lien, Yang-Shih Lin, Chueh-Yang Liu, Chia-Hsum Hsu, Chia-Fu Chen

“…The characterization of the nc-SiGe films are analyzed by scanning electron microscopy, UV-visible spectroscopy, and Fourier transform infrared absorption spectroscopy. The band gap of SiGe alloy can be adjusted between 0.8 and 1.7 eV by varying the gas ratio. …”
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Novel Terthiophene-Substituted Fullerene Derivatives as Easily Accessible Acceptor Molecules for Bulk-Heterojunction Polymer Solar Cells by Filippo Nisic, Alessia Colombo, Claudia Dragonetti, Alessandra Cominetti, Andrea Pellegrino, Nicola Perin, Riccardo Po, Alessandra Tacca

“…In addition, they have a relatively high LUMO level and a low band gap that can be easily tuned by an adequate design of the link between the fullerene and the terthiophene. …”
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Bandgap Engineering of TiO2 for Enhanced Selectivity in Photoelectrochemical Glycerol Oxidation by Claudio M. Pecoraro, Siming Wu, Monica Santamaria, Patrik Schmuki

“…., light that excites N‐related states in the band gap of TiO2. The N‐doped material also exhibits remarkable stability over prolonged reaction periods. …”
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Synthesis and Characterization of Iron Doped Titanium Dioxide (Fe: TiO2) Nanoprecipitate at Different pH Values for Applications of Self-Cleaning Materials by Tizazu Abza, Abel Saka, Jule Leta Tesfaye, Lamessa Gudata, N. Nagaprasad, Ramaswamy Krishnaraj

“…Extremely translucent nanopowders are witnessed in the observable region by visible and redshifts near advanced wavelengths with rising pH values because of an increase in the size of particles from XRD data and SEM micrographs. The band gap of energy produced by nano concentrates was reduced with growing pH values that resemble the redshift of optical absorption superiority. …”
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Photocatalytic Activity and Characterization of Carbon-Modified Titania for Visible-Light-Active Photodegradation of Nitrogen Oxides by Chun-Hung Huang, Yu-Ming Lin, I-Kai Wang, Chun-Mei Lu

“…Analysis of UV-visible spectrum indicated that carbon modification promoted visible light absorption and red shift in band gap. XPS spectroscopic analysis identified the existence of carbonate species (C=O), which increased with the increasing carbon number of precursor molecule. …”
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The role of reaction temperature in synthesizing clove-derived copper oxide nanoparticles for brain cancer treatment by Mehrnoosh Fakhredin, Fatemeh Shariatmadar Tehrani, Maryam Aliannezhadi

“…Additionally, it is verified that the calcination process influenced the structural, morphological, and optical properties of the synthesized nanoparticles, yielding narrow-band gap CuO NPs in monoclinic crystalline structure in all reaction temperatures. …”
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Nanostructured Porous Silicon Photonic Crystal for Applications in the Infrared by G. Recio-Sánchez, V. Torres-Costa, M. Manso-Silván, R. J. Martín-Palma

“…For 2D structures, a complete photonic band gap for TE polarization is found in the thermal infrared range. …”
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Characterization of Cobalt Sulfide Thin Films Synthesized from Acidic Chemical Baths by Tizazu Abza, Dereje Gelanu Dadi, Fekadu Gashaw Hone, Tesfaye Chebelew Meharu, Gebremeskel Tekle, Eyobe Belew Abebe, Kalid Seid Ahmed

“…The scanning electron microscopic images revealed crack and pinhole free thin films with uniform and smooth background and few large polygonal grains on the surface. The band gap of the cobalt sulfide thin films decreased from 1.75 eV to 1.3 eV as the deposition time increased from 2 hrs to 3.5 hrs. …”
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Annealing-Induced Modifications in Physicochemical and Optoelectronic Properties of Ag-Doped Nanostructured CdS Thin Films by Vidya S. Taur, Rajesh A. Joshi, Ramphal Sharma

“…Red shift in optical absorbance strength and energy band gap values from 2.28 to 2.14 eV is obtained. I-V response obtained from as grown and annealed thin films shows an enhancement in photosensitivity from 72% to 96% upon illumination to 100 mW/cm2 light source.…”
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Structural and Optical Properties of Amorphous Al2O3 Thin Film Deposited by Atomic Layer Deposition by Shuzheng Shi, Shuo Qian, Xiaojuan Hou, Jiliang Mu, Jian He, Xiujian Chou

“…It is found that the band gap exhibits a steady value ~2.3 eV by the UV-VIS transmittance method, but the T-L model was ~3.0 eV. …”
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Photocatalytic Bactericidal Efficiency of Ag Doped TiO2/Fe3O4 on Fish Pathogens under Visible Light by Ekkachai Kanchanatip, Nurak Grisdanurak, Naichia Yeh, Ta Chih Cheng

“…The Ag-TiO2/Fe3O4 prepared in this study displays significantly enhanced visible light absorption and narrowed band gap energy. The magnetic property of Ag-TiO2/Fe3O4 made it easy for retrieval using a permanent magnet bar. …”
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Mechanochemical Synthesis of Visible Light Sensitive Titanium Dioxide Photocatalyst by Jan Šubrt, Jose M. Criado, Lórant Szatmáry, Maria J. Diánez-Millán, Nataliya Murafa, Luis A. Pérez-Maqueda, Vlasta Brezová

“…The UV-visible absorption spectrum showed narrowing the band gap width after grinding with an ammonium carbamate additive resulting in shift of the light absorption of the ground sample towards the visible region. …”
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Enhanced Visible Light Photocatalytic Activity for TiO2 Nanotube Array Films by Codoping with Tungsten and Nitrogen by Min Zhang, Juan Wu, DanDan Lu, Jianjun Yang

“…The mechanism of the enhanced photocatalytic activity could be attributed to (i) increasing number of hydroxyl groups on the surface of TNAs after the hydrothermal treatment, (ii) a strong W-N synergistic interaction leads to produce new states, narrow the band gap which decrease the recombination effectively, and then greatly increase the visible light absorption and photocatalytic activity; (iii) W ions with changing valences in all codoped samples which are considered to act as trapping sites, effectively decrease the recombination rate of electrons and holes, and improve the photocatalytic activity.…”
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