Perovskite solar cells could strongly compete with the silicon solar cells in the market soon as illustrated in recent studies.In this work,promising and stable metal-free perovskite solar cells(PSCs)has been successf...Perovskite solar cells could strongly compete with the silicon solar cells in the market soon as illustrated in recent studies.In this work,promising and stable metal-free perovskite solar cells(PSCs)has been successfully fabricated using an inorganic SnO_(2)/Quantum dot SnO_(2)(QD-SnO_(2))double layer as an efficient electron transport layer via a low-temperature solution process.The fully-air fabricated PSCs in the form of FTO/SnO_(2)/QD-SnO_(2)/CH3NH3PbI3/Carbon were tested at different annealed QD-SnO_(2) between 300 and 500℃.The as-prepared QD-SnO_(2) and the fabricated devices are characterized by various techniques,including XRD,XPS,HR-TEM,FE-SEM,UVeviseNIR spectroscopy,PL,and solar simulator.The prepared QD-SnO_(2) at 300℃ has shown well-ordered nanoparticles of 5.6 nm in diameter with superior carrier density(1.5×10^(15) cm^(-3))and highest carrier mobility(64.1 cm^(2)·V^(-1)·s^(-1)),accelerating the carriers separation process within the cell.The best devices demonstrated a maximum power conversion effi-ciency(PCE)of 11.7%,VOC 0.81 V,JSC 19.5 mA·cm^(-2),and FF 74%.The presence of an interfacial layer of QDSnO_(2) over the blocking SnO_(2) upsurges the band gaps alignment and accelerates the carriers extraction rate affecting the performance of the fabricated perovskite devices.Moreover,the optimized fabricated devices revealed a shelf stability-life of four months in humid air(40%-50%)with>83%of its initial PCE.This simple synthetic approach can develop the opportunities to transfer the cell from the lab to the market,which will be compatible with large-scale production.展开更多
Herein,the fabrication of cellulose acetate(CA)silica-based nanocomposite membranes via the dry-wetphase inversion procedure for water desalination was investigated.The modified and unmodified silicananoparticles(MSNP...Herein,the fabrication of cellulose acetate(CA)silica-based nanocomposite membranes via the dry-wetphase inversion procedure for water desalination was investigated.The modified and unmodified silicananoparticles(MSNPs and SNPs)were prepared by the sol-gel technique.The effect of the SNPs andMSNPs was investigated on the CA membrane's properties and their performance for water desalination.The CA nanocomposite membranes were characterized to study their structure,hydrophilicity,andmorphology.The fabricated nanocomposite membranes showed hydrophilic surface properties.Theperformance of reverse osmosis(RO)membranes was measured using a crossflow RO unit at 10 bar(1 bar=0.1 MPa).The membrane with 10 mg of SNPs enhanced permeate water flux compared to thepristine CA membrane by 1.6 L/(m2·h).The effect of MSNPs on the nanocomposites'performance waslower than their counterpart in the case of adding SNPs.The membrane with 30 mg of MSNPs showedthe highest permeate water flux among other nanocomposite membranes with a value oAQSf 35.7 L/(m2·h)at 24 bar.展开更多
基金supported by the Academy of Scientific Research and Technology(ASRT),Program of Scientists for Next Generation under grant no.(SNG-5),Egypt.supported by Science,Technology&Innovation Funding Authority(STDF)under grant no.(25522)supported by US-Egypt Joint project Cycle 17 no.229.
文摘Perovskite solar cells could strongly compete with the silicon solar cells in the market soon as illustrated in recent studies.In this work,promising and stable metal-free perovskite solar cells(PSCs)has been successfully fabricated using an inorganic SnO_(2)/Quantum dot SnO_(2)(QD-SnO_(2))double layer as an efficient electron transport layer via a low-temperature solution process.The fully-air fabricated PSCs in the form of FTO/SnO_(2)/QD-SnO_(2)/CH3NH3PbI3/Carbon were tested at different annealed QD-SnO_(2) between 300 and 500℃.The as-prepared QD-SnO_(2) and the fabricated devices are characterized by various techniques,including XRD,XPS,HR-TEM,FE-SEM,UVeviseNIR spectroscopy,PL,and solar simulator.The prepared QD-SnO_(2) at 300℃ has shown well-ordered nanoparticles of 5.6 nm in diameter with superior carrier density(1.5×10^(15) cm^(-3))and highest carrier mobility(64.1 cm^(2)·V^(-1)·s^(-1)),accelerating the carriers separation process within the cell.The best devices demonstrated a maximum power conversion effi-ciency(PCE)of 11.7%,VOC 0.81 V,JSC 19.5 mA·cm^(-2),and FF 74%.The presence of an interfacial layer of QDSnO_(2) over the blocking SnO_(2) upsurges the band gaps alignment and accelerates the carriers extraction rate affecting the performance of the fabricated perovskite devices.Moreover,the optimized fabricated devices revealed a shelf stability-life of four months in humid air(40%-50%)with>83%of its initial PCE.This simple synthetic approach can develop the opportunities to transfer the cell from the lab to the market,which will be compatible with large-scale production.
文摘Herein,the fabrication of cellulose acetate(CA)silica-based nanocomposite membranes via the dry-wetphase inversion procedure for water desalination was investigated.The modified and unmodified silicananoparticles(MSNPs and SNPs)were prepared by the sol-gel technique.The effect of the SNPs andMSNPs was investigated on the CA membrane's properties and their performance for water desalination.The CA nanocomposite membranes were characterized to study their structure,hydrophilicity,andmorphology.The fabricated nanocomposite membranes showed hydrophilic surface properties.Theperformance of reverse osmosis(RO)membranes was measured using a crossflow RO unit at 10 bar(1 bar=0.1 MPa).The membrane with 10 mg of SNPs enhanced permeate water flux compared to thepristine CA membrane by 1.6 L/(m2·h).The effect of MSNPs on the nanocomposites'performance waslower than their counterpart in the case of adding SNPs.The membrane with 30 mg of MSNPs showedthe highest permeate water flux among other nanocomposite membranes with a value oAQSf 35.7 L/(m2·h)at 24 bar.
