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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 | 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 |
| 4 | 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 |
| 5 | Characterization of a commercial dye-sensitised titania solar cell electrode显示文摘 | Tuquabo T Geoffrey W John B | 2003 | Solar Energy Materials and Solar Cells2003，76，1： | 1 |
| 6 | Efficient CO_(2)Reduction to Formate on CsPbI_(3) Nanocrystals Wrapped with Reduced Graphene Oxide显示文摘Transformation of greenhouse gas(CO_(2))into valuable chemicals and fuels is a promising route to address the global issues of climate change and the energy crisis.Metal halide perovskite catalysts have shown their potential in promoting CO_(2)reduction reaction(CO_(2)RR),however,their low phase stability has limited their application perspective.Herein,we present a reduced graphene oxide(rGO)wrapped CsPbI_3 perovskite nanocrystal(NC)CO_(2)RR catalyst(CsPbI_3/rGO),demonstrating enhanced stability in the aqueous electrolyte.The CsPbI_3/rGO catalyst exhibited>92%Faradaic efficiency toward formate production at a CO_(2)RR current density of~12.7 mA cm^(-2).Comprehensive characterizations revealed the superior performance of the CsPbI_3/rGO catalyst originated from the synergistic effects between the CsPbI_3 NCs and rGO,i.e.,rGO stabilized theα-CsPbI_3 phase and tuned the charge distribution,thus lowered the energy barrier for the protonation process and the formation of~*HCOO intermediate,which resulted in high CO_(2)RR selectivity toward formate.This work shows a promising strategy to rationally design robust metal halide perovskites for achieving efficient CO_(2)RR toward valuable fuels. | Minh Tam Hoang Chen Han Zhipeng Ma Xin Mao Yang Yang Sepideh Sadat Madani Paul Shaw Yongchao Yang Lingyi Peng Cui Ying Toe Jian Pan Rose Amal Aijun Du Tuquabo Tesfamichael Zhaojun Han Hongxia Wang | 2023 | Nano-Micro Letters2023，15，10： | 1 |
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