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| 1 | Surface Treatment of Inorganic CsPbI_(3) Nanocrystals with Guanidinium Iodide for Efficient Perovskite Light-Emitting Diodes with High Brightness显示文摘The remarkable evolution of metal halide perovskites in the past decade makes them promise for next-generation optoelectronic material.In particular,nanocrystals(NCs)of inorganic perovskites have demonstrated excellent performance for light-emitting and display applications.However,the presence of surface defects on the NCs negatively impacts their performance in devices.Herein,we report a compatible facial post-treatment of CsPbI_(3) nanocrystals using guanidinium iodide(GuI).It is found that the GuI treatment effectively passivated the halide vacancy defects on the surface of the NCs while offering effective surface protection and exciton confinement thanks to the beneficial contribution of iodide and guanidinium cation.As a consequence,the film of treated CsPbI_(3) nanocrystals exhibited significantly enhanced luminescence and charge transport properties,leading to high-performance light-emitting diode with maximum external quantum efficiency of 13.8%with high brightness(peak luminance of 7039 cd m^(−2) and a peak current density of 10.8 cd A^(−1)).The EQE is over threefold higher than performance of untreated device(EQE:3.8%).The operational half-lifetime of the treated devices also was significantly improved with T50 of 20 min(at current density of 25 mA cm^(−2)),outperforming the untreated devices(T50~6 min). | Minh Tam Hoang Amandeep Singh Pannu Yang Yang Sepideh Madani Paul Shaw Prashant Sonar Tuquabo Tesfamichael Hongxia Wang | 2022 | Nano-Micro Letters2022，14，4： | 2 |
| 2 | Nanoporous SiO_x coated amorphous silicon anode material with robust mechanical behavior for high-performance rechargeable Li-ion batteries显示文摘Silicon is a promising anode material for rechargeable Li-ion battery (LIB) due to its high energy density and relatively low operating voltage. However, silicon based electrodes suffer from rapid capacity degradation during electrochemical cycling. The capacity decay is predominantly caused by (i) cracking due to large volume variations during lithium insertion/extraction and (ii) surface degradation due to excessive solid electrolyte interface (SEI) formation. In this work, we demonstrate that coating of a-Si thin film with a Li-active, nanoporous SiOx layer can result in exceptional electrochemical performance in Li-ion battery. The SiOx layer provides improved cracking resistance to the thin film and prevent the active material loss due to excessive SEI formation, benefiting the electrode cycling stability. Half-cell experiments using this anode material show an initial reversible capacity of 2173 mAh g^-1 with an excellent coulombic efficiency of 90.9%. Furthermore, the electrode shows remarkable capacity retention of ~97% after 100 cycles at C/2 charging rate. The proposed anode architecture is free from Liinactive binders and conductive additives and provides mechanical stability during the charge/discharge process. | Hansinee S. Sitinamaluwa Henan Li Kimal C. Wasalathilake Annalena Wolff Tuquabo Tesfamichael Shanqing Zhang Cheng Yan | 2019 | Nano Materials Science2019，1，1： | 2 |
| 3 | Analysis of nitrogen implanted tin oxide films used in dye-sensitised solar cells显示文摘 | TESFAMICHAEL T WILL G KELLY I | 2004 | Nuclear Instruments and Methods in Physics Research Section B2004，217，1： | 1 |
| 4 | Nitrogen ion implanted nanostructured titania films used in dye-sensitised solar cells and photocatalyst显示文摘 | Tesfamichael T Will G Bell J | 2005 | Applied Surface Science2005，245，1234： | 1 |
| 5 | Optical and electrical properties of nitrogen ion implanted fluorine doped tin oxide films 显示文摘 | TESFAMICHAEL T WILL G COLELLA Michael | 2003 | Nuclear Instruments and Methods in Physics Research2003，201，： | 1 |
| 6 | Treatment of antireflection on tin oxidecoated anodized aluminum selective absorber surface显示文摘 | Tesfamichael T Roos A | 1998 | SolEnergy Mater Sol Cells1998，54，1234： | 1 |
| 7 | Low tern perature CO sensitive nanostructured WO3 thin films doped with Fe显示文摘 | Ahsan M Tesfamichael T Ionescu M | 2012 | Sensors and Actuators B: Chemical2012，162，1： | 1 |
| 8 | Nitrogen ion implanted nanostruetured titania films used in dyesensitised solar cells and photoeatalyst 显示文摘 | Tuquabo Tesfamichael Geoffrey Will John Bell | 2005 | Applied Surface Science2005，245，： | 1 |
| 9 | A feasibility study of integrally colored Al-Si as a solar selective absorber 显示文摘 | Tesfamichael T Vargas W E | 1998 | Solar Energy Materials and Solar Cells1998，55，3： | 1 |
| 10 | Angular solar absorptance and incident angle modifier of selective absorbers for solar thermal collectors显示文摘 | Tesfamichael T Wackelgard E | 2000 | Solar Energy2000，684，： | 1 |
| 11 | Gas sensing characteristics of Fe-doped tungsten oxide thin films显示文摘 | Tuquabo Tesfamichael Andrea Ponzoni Mohammed Ahsan Guido Faglia | 2012 | Chemical2012，，： | 1 |
| 12 | Treatment of antireflection on tin oxide coated anodized aluminum selective absorber surface显示文摘 | TESFAMICHAEL T ROOS A | 1998 | Solar Energy Materials and Solar Cells1998，54，14： | 1 |
| 13 | A feasibility study of integrally colored AI--Si as a solar selective absorber显示文摘 | Tesfamichael T Vargas W E | 1998 | Solar Energy Materials and Solar Cells1998，55，3： | 1 |
| 14 | Evaluation of groundwater resource in the Geba basin,Ethiopia显示文摘 | Kibrewossen Tesfagiorgis Tesfamichael Gebreyohannes Florimond De Smedt | | 0，，03： | 1 |
| 15 | Treatment of antireflection on tin oxide coated anodized aluminum selective absorber surface 显示文摘 | Tesfamichael T Roos A | 1998 | Solar Energy Mater Solar Cells1998，54，14： | 1 |
| 16 | Multidisciplinaryevaluation of the sustainability of Red Sea fisheriesusing Rapfish显示文摘 | Tesfamichael D Pitcher T J | 2006 | Fisheries research2006，78，2： | 1 |
| 17 | Oxidation kinetics of nickel solar absorber nanoparticles显示文摘 | Karmhag P Tesfamichael T Niklasson G A | 2001 | J Phys D2001，34，： | 1 |
| 18 | Angular solar absorptance and incident angle modifier of selective absorbers for solar thermal collectors 显示文摘 | TESFAMICHAEL T WACKELGARD E | 2000 | Sol Energy2000，68，4： | 1 |
| 19 | Angular solar absorptance and incident angle modifier of selective absorbers for solar thermal collectors显示文摘 | TESFAMICHAEL T WACKELGARD E | 2000 | Sol Energy2000，68，4： | 1 |
| 20 | A theoretical feasibility study of pigments for thickness-sensitive spectrally selective paints 显示文摘 | ETHERDEN N TESFAMICHAEL T NIKLASSON G A | 2004 | J Phys D: Appl Phys2004，37，7： | 1 |
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