Copper nanowires （Cu NWs） have attracted increasing attention as building blocks for electronics due to their outstanding electrical properties and low cost. However, organic residues and oxide layers ubiquitously e...Copper nanowires （Cu NWs） have attracted increasing attention as building blocks for electronics due to their outstanding electrical properties and low cost. However, organic residues and oxide layers ubiquitously existing on the surface of Cu NWs impede good inter-wire contact. Commonly used methods such as thermal annealing and acid treatment often lead to nanowire damage. Herein, hydrogen plasma treatment at room temperature has been demonstrated to be effective for simultaneous surface cleaning and selective welding of Cu NWs at junctions. Transparent electrodes with excellent optical-electrical performance （19 ff）-sq-1 @ 90% T） and enhanced stability have been fabricated and integrated into organic solar cells. Besides, Cu NW conductors with superior stretchability and cycling stability under stretching speeds of up to 400 mm-min-＇ can also be produced by the nanowelding process, and the feasibility of their application in stretchable LED circuits has been demonstrated.展开更多
Green, biodegradable, and eco-friendly interface materials based on cellulose and its derivatives were prepared for organic solar cells(OSCs). In this work, calcium and two derivatives of cellulose with different carb...Green, biodegradable, and eco-friendly interface materials based on cellulose and its derivatives were prepared for organic solar cells(OSCs). In this work, calcium and two derivatives of cellulose with different carboxy acid groups, denoted as Cellulose-COOH and Cellulose-(COOH)n, were used as cathode interfacial layers of OSCs, and a blend of the low-band-gap semiconducting polymers thieno[3, 4-b]thiophene/benzodithiophene(PTB7)and [6, 6]-phenyl C71-butyric acid methyl ester(PC71BM) was chosen as the photoactive layer. OSCs were fabricated with a configuration of indiumdoped tin oxide(ITO)/poly(3, 4-ethylenedioxythiophene) : polystyrene sulfonate(PEDOT: PSS)/PTB7: PC71BM/Ca or Cellulose-COOH or Cellulose-(COOH)n/Al. As a result, the effect of cellulose-COOH was the best one among them, and the power conversion efficiency(PCE) reached 8.21%for the devices with cathode interfacial layer of Cellulose-COOH, which was better than that of OSCs using calcium as a modifier(PCE=7.95%). The favorable performance is attributed to the reduced work function and improved electron transfer caused by the introduction of carboxy cellulose between the active layer and the electrode. The developed technology shows great potential in accelerating the diversified applications of cellulose and producing cost-effective and eco-friendly interfaces for OSCs.展开更多
基金This work was financially supported by the National Basic Research Program of China （No. 2012CB932303）, the National Natural Science Foundation of China （No. 61301036）, Shanghai Municipal Natural Science Foundation （No. 13ZR1463600）, and the Innovation Project of Shanghai Institute of Ceramics.
文摘Copper nanowires （Cu NWs） have attracted increasing attention as building blocks for electronics due to their outstanding electrical properties and low cost. However, organic residues and oxide layers ubiquitously existing on the surface of Cu NWs impede good inter-wire contact. Commonly used methods such as thermal annealing and acid treatment often lead to nanowire damage. Herein, hydrogen plasma treatment at room temperature has been demonstrated to be effective for simultaneous surface cleaning and selective welding of Cu NWs at junctions. Transparent electrodes with excellent optical-electrical performance （19 ff）-sq-1 @ 90% T） and enhanced stability have been fabricated and integrated into organic solar cells. Besides, Cu NW conductors with superior stretchability and cycling stability under stretching speeds of up to 400 mm-min-＇ can also be produced by the nanowelding process, and the feasibility of their application in stretchable LED circuits has been demonstrated.
基金financially supported by the National Natural Science Foundation of China(21674123,31700520)National Natural Science Foundation of Fujian Province(2018J01592)+1 种基金Project of “100 People Planning in Fujian Province”,New Century Excellent Talents in Fujian Province University(KLa17009A)International Cooperation Project of Fujian Agriculture and Forestry University(KXGH17003).
文摘Green, biodegradable, and eco-friendly interface materials based on cellulose and its derivatives were prepared for organic solar cells(OSCs). In this work, calcium and two derivatives of cellulose with different carboxy acid groups, denoted as Cellulose-COOH and Cellulose-(COOH)n, were used as cathode interfacial layers of OSCs, and a blend of the low-band-gap semiconducting polymers thieno[3, 4-b]thiophene/benzodithiophene(PTB7)and [6, 6]-phenyl C71-butyric acid methyl ester(PC71BM) was chosen as the photoactive layer. OSCs were fabricated with a configuration of indiumdoped tin oxide(ITO)/poly(3, 4-ethylenedioxythiophene) : polystyrene sulfonate(PEDOT: PSS)/PTB7: PC71BM/Ca or Cellulose-COOH or Cellulose-(COOH)n/Al. As a result, the effect of cellulose-COOH was the best one among them, and the power conversion efficiency(PCE) reached 8.21%for the devices with cathode interfacial layer of Cellulose-COOH, which was better than that of OSCs using calcium as a modifier(PCE=7.95%). The favorable performance is attributed to the reduced work function and improved electron transfer caused by the introduction of carboxy cellulose between the active layer and the electrode. The developed technology shows great potential in accelerating the diversified applications of cellulose and producing cost-effective and eco-friendly interfaces for OSCs.
