Anomalous temperature dependence of the conductivity of nanoporous ITO films

Ryzhikov, I. A.; Pukhov, A. A.; Ilin, Alexander; Glukhova, N. P.; Afanasiev, K. N.; Ryzhikov, Andrey

doi:10.1016/s0167-9317(03)00308-3

Cited by 9 publications

(8 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In other words, the device with TiO 2 nanotubes arrays heated up to 500 • C had better crystallization and resulted in higher current density. Further increase in the annealing temperature would have been a disadvantage as the conductivity of ITO decreases [16]. In addition the phase transformation from anatase to rutile could take place at high temperature [17].…”

Section: Resultsmentioning

confidence: 99%

Efficient inverted solar cells using TiO₂nanotube arrays

Tsai

et al. 2008

Nanotechnology

114

View full text Add to dashboard Cite

Using a vertical titania (TiO(2)) nanotube array, an inverted polymer solar cell was constructed with power conversion efficiency up to 2.71%. In this study, self-organized TiO(2) nanotubes arrays were grown by anodizing Ti metal in glycerol electrolyte containing 0.5 wt% NH(4)F and 1.0 wt% H(2)O with 20 V potential. The tube length (∼100 nm) was controlled by the thickness of the sputtered titanium layer on the indium-tin oxide (ITO) substrate. The diameter of the tube was approximately 15-25 nm. After annealing in air at 500 °C for 1 h, nanotubes arrays were crystallized to the anatase phase from the initial amorphous state. Following the infiltration of polymeric semiconductor (poly(3-hexylthiophene) and (6,6)-phenyl C(60) butyric acid methyl ester, P3HT:PCBM), the filled TiO(2) layer had an optical absorption over a range from UV to visible light. The high surface-to-volume ratio of the nanotube arrays structure increased the effective area of the active region. The high efficiency of our solar cell is attributed to the vertical TiO(2) nanotube array's enhanced conduction of photo-induced current due to its charge transport capability.

show abstract

Section: Resultsmentioning

confidence: 99%

Efficient inverted solar cells using TiO₂nanotube arrays

Tsai

et al. 2008

Nanotechnology

114

View full text Add to dashboard Cite

show abstract

“…Whereas G does not increase until 400 K during the heating, it decreases steadily during cooling down to 300 K; at the same temperature from 300 to 580 K, G is higher during the cooling than the heating, and, after the heating and cooling cycle, G returns to a higher value than its initial value. Such differences and hysteresis strongly suggest irreversible changes during the cycle, as is the case in SnO 2 thin films [1,2,14,15]. To look into the mechanism that controls the behaviors shown in figure 3(b), ln G is plotted against 1/ T in figure 4(a), where the hysteresis between 300 and 570 K is more obvious.…”

Section: Resultsmentioning

confidence: 99%

Electrical characterization of a single electrospun porous SnO₂nanoribbon in ambient air

Wang¹,

Ramos²,

Santiago-Avilés³

2007

Nanotechnology

View full text Add to dashboard Cite

The electrical conductance of a single porous SnO2 ribbon, synthesized from dimethyldineodecanoate tin using electrospinning and metallo-organic decomposition techniques, has been measured using the two-probe method in atmosphere following a cycle of heating from 300 to 660 K and subsequent cooling from 660 to 300 K. During the heating, the conductance (G) is relatively insensitive to the temperature below 380 K and, above that, follows an Arrhenius relation with a thermal activation energy of 0.918 ± 0.004 eV until 660 K; upon cooling, G follows the same Arrhenius relation until 570 K and, below that, observes another Arrhenius relation with a lower activation energy of 0.259 ± 0.006 eV. After a cycle of heating and cooling, G returns to a value higher than its initial one. The Arrhenius relations are attributed to the surface adsorption and desorption of moisture and oxygen, and the G hysteresis between 300 and 380 K is attributed to the partial replacement of adsorbed oxygen by moisture because of the porous nature of the ribbon surface.

show abstract

“…where S stands for surface [6][7][8][9]. Note that moisture and oxygen have opposite effects on G and their adsorption and desorption dynamics are different.…”

Section: Resultsmentioning

confidence: 99%

“…The G vs T hystersis is actually due to the partial replacing of adsorbed oxygen by moisture on SnO 2 surface after the heating and cooling cycle. Such irreversible replacement can be attributed to the numerous pores within the ribbon, whose capillary effects additionally restrict adsorption, desorption, diffusion and evaporation [9].…”

Section: Resultsmentioning

confidence: 99%

Temperature dependence of electrical conductance in a single porous SnO 2 nanoribbon

2007

View full text Add to dashboard Cite

Porous SnO 2 nanoribbons, with their width and thickness of around 20µm and 20nm, respectively, have been fabricated from the metallo-organic dimethyldineodecanoate tin using electrospinning and thermal decomposition techniques. The electrical conductance of one synthesized single ribbon has been measured using the two-probe method in atmosphere following a cycle of heating from 300 to 660K and subsequent cooling from 660K to 300K. During the heating, the conductance, G is not so sensitive to the temperature below 380K and, above that, follows an Arrhenius relation with a thermal activation energy of 0.918±0.004 eV until 660K; upon cooling, G follows the same Arrhenius relation until 570K and, below that, observes another Arrhenius relation with its activation energy decreasing to 0.259±0.006eV down to 300K. After a cycle of heating and cooling, G returns to a value higher than its initial one. The Arrhenius relations are attributed to the surface adsorption and desorption of moisture and oxygen, and the G hysteresis between 300 and 380K is attributed to the partial replacement of adsorbed oxygen by moisture because of the porous nature of the surface.

show abstract

Anomalous temperature dependence of the conductivity of nanoporous ITO films

Cited by 9 publications

References 2 publications

Efficient inverted solar cells using TiO₂nanotube arrays

Efficient inverted solar cells using TiO₂nanotube arrays

Electrical characterization of a single electrospun porous SnO₂nanoribbon in ambient air

Temperature dependence of electrical conductance in a single porous SnO 2 nanoribbon

Contact Info

Product

Resources

About

Anomalous temperature dependence of the conductivity of nanoporous ITO films

Cited by 9 publications

References 2 publications

Efficient inverted solar cells using TiO2nanotube arrays

Efficient inverted solar cells using TiO2nanotube arrays

Electrical characterization of a single electrospun porous SnO2nanoribbon in ambient air

Temperature dependence of electrical conductance in a single porous SnO 2 nanoribbon

Contact Info

Product

Resources

About

Efficient inverted solar cells using TiO₂nanotube arrays

Efficient inverted solar cells using TiO₂nanotube arrays

Electrical characterization of a single electrospun porous SnO₂nanoribbon in ambient air