In order to realize ultralow surface reflectance and broadband antireflection effects which common pyramidal textures and antireflection coatings can't achieve in photovoltaic industry,we used low-cost and easy-ma...In order to realize ultralow surface reflectance and broadband antireflection effects which common pyramidal textures and antireflection coatings can't achieve in photovoltaic industry,we used low-cost and easy-made Ag-catalyzed etching techniques to synthesize silicon nanowires(Si NWs) arrays on the substrate of single-crystalline silicon.The dense vertically-aligned Si NWs arrays are fabricated by local oxidation and selective dissolution of Si in etching solution containing Ag catalyst.The Si NWs arrays with 3 μm in depth make reflectance reduce to less than 3% in the range of 400 to 1000 nm while reflectance gradually reached the optimum value with the increasing of etching time.The antireflection of Si NWs arrays are based on indexgraded mechanism:Si NWs arrays on a subwavelength scale strongly scatter incident light and have graded refractive index that enhance the incidence of light in usable wavelength range.However,surface recombination of Si NWs arrays are deteriorated due to numerous dangling bonds and residual Ag particles.展开更多
Several simple, fast and practical protocols have been developed to synthesize internal or terminal propargylamines and chalcones via A^(3)-coupling reaction of aldehydes, amines, and alkynes catalyzed by an easily av...Several simple, fast and practical protocols have been developed to synthesize internal or terminal propargylamines and chalcones via A^(3)-coupling reaction of aldehydes, amines, and alkynes catalyzed by an easily available catalyst Ag_(2)CO_(3)under solvent-free condition. The reaction proceeded smoothly to deliver various products in good-to-excellent yields with good functional group tolerance. Gram-scale preparation, bioactive molecule synthesis and asymmetric substrates have been demonstrated. Furthermore,plausible mechanisms for the synthesis of different products have been proposed.展开更多
基金partly supported by Natural Science Foundation of China (No.60876045)Shanghai Leading Basic Research Pro ject (No.09JC1405900)+2 种基金Shanghai Leading Academic Discipline Pro ject (No.S30105)R&D Foundation of SHU-SOENs PV Joint Lab (No.SS-E0700601)supported by Analysis and Testing Center of Shanghai University
文摘In order to realize ultralow surface reflectance and broadband antireflection effects which common pyramidal textures and antireflection coatings can't achieve in photovoltaic industry,we used low-cost and easy-made Ag-catalyzed etching techniques to synthesize silicon nanowires(Si NWs) arrays on the substrate of single-crystalline silicon.The dense vertically-aligned Si NWs arrays are fabricated by local oxidation and selective dissolution of Si in etching solution containing Ag catalyst.The Si NWs arrays with 3 μm in depth make reflectance reduce to less than 3% in the range of 400 to 1000 nm while reflectance gradually reached the optimum value with the increasing of etching time.The antireflection of Si NWs arrays are based on indexgraded mechanism:Si NWs arrays on a subwavelength scale strongly scatter incident light and have graded refractive index that enhance the incidence of light in usable wavelength range.However,surface recombination of Si NWs arrays are deteriorated due to numerous dangling bonds and residual Ag particles.
基金financial support from the National Natural Science Foundation of China (Nos. 21802093, 21536003)Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (No. 2019L0408)the Ph D Start-up Foundation of Shanxi Medical University (No. 03201501) for the financial support。
文摘Several simple, fast and practical protocols have been developed to synthesize internal or terminal propargylamines and chalcones via A^(3)-coupling reaction of aldehydes, amines, and alkynes catalyzed by an easily available catalyst Ag_(2)CO_(3)under solvent-free condition. The reaction proceeded smoothly to deliver various products in good-to-excellent yields with good functional group tolerance. Gram-scale preparation, bioactive molecule synthesis and asymmetric substrates have been demonstrated. Furthermore,plausible mechanisms for the synthesis of different products have been proposed.