Amorphous Silicon 2-TFT Pixel Circuits on Stainless Steel Foils

2006 ◽  
Vol 910 ◽  
Author(s):  
Alex Z Kattamis ◽  
I-Chun Cheng ◽  
Yongtaek Hong ◽  
Sigurd Wagner
Keyword(s):  
Stainless Steel ◽  
Amorphous Silicon ◽  
Supply Voltage ◽  
Chemical Vapor ◽  
Capacitive Coupling ◽  
Storage Capacitor ◽  
Vertical Stripe ◽  
Silicon Thin Film ◽  
Stainless Steel Foils ◽  
Steel Foils

AbstractWe have fabricated pixel circuits consisting of two bottom-gate staggered source-drain amorphous silicon thin-film transistors (a-Si:H TFTs) on flexible stainless steel foils. Stainless steel is attractive because it allows for high processing temperatures of >300°C and is a perfect barrier to oxygen and moisture. Our steel foils were 75m thick, with a peak-to-peak surface roughness of >1.2m. This rough, as-rolled, conductive surface needed a thick planarization and passivation (electrical isolation) layer. The surface was planarized with 1.6m of spin-on-glass, which reduced the roughness to ~0.3m peak-to-peak. A passivation layer of 0.6m of SiNx deposited by plasma-enhanced chemical vapor deposition was used to reduce leakage currents and capacitive coupling to the substrate. The 92m × 369m voltage-programmed pixel circuits employ a switching (Sw) TFT (W/L=50/5m), a driver (Dr) TFT (W/L=200/5m), and a 2pF storage capacitor between the gate and source of the Dr TFT. With a supply voltage of VDD=20V and a drive bias of 20V the circuits deliver 26A of current. The vertical stripe pixels were integrated into 48 × (4) × 48 arrays and passivated with SiNx. Anode metal of Al-1% Si was also deposited, preparing the displays for subsequent OLED fabrication. Pixel circuits with this performance can drive top-emitting organic light emitting diodes (OLEDs) and therefore can be used in backplanes for flexible, high-resolution, active-matrix OLED displays.

scholarly journals Multiwalled carbon nanotubes synthesis from methane using a stainless steel foils as a catalyst

2021 ◽  
Vol 10 (1) ◽  
pp. 54-58
Author(s):  
Thuan Huynh Minh ◽  
Sura Nguyen ◽  
Ngan Nguyen Thi Kim ◽  
Huan Nguyen Manh ◽  
Noa Uy Do Pham ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Stainless Steel ◽  
Chemical Vapor ◽  
Treatment Temperature ◽  
Multiwalled Carbon ◽  
Nucleation Sites ◽  
Pre Treatment ◽  
20 Nm ◽  
Stainless Steel Foils ◽  
Steel Foils

In this study, a thin stainless-steel foil was used as a catalyst for carbon nanotubes (CNTs) using methane as a carbon source via the chemical vapor deposition (CVD) method. Our results revealed that pre-treatment step of the catalyst plays an important role in CNT formation. In our experiments, a catalyst pre-treatment temperature of 850 oC have been found to facilitate the surface roughness and provide more active nucleation sites for CNTs formation. Multiwalled CNTs with 6 layers, their diameters of 10 – 20 nm and their length of app. 300 nm were grown. This finding might lead to a process for improving the quality of MWCNTs grown on steel foil as catalyst.

Segmented Amorphous Silicon n-i-p Photodiodes on Stainless-Steel Foils for Flexible Imaging Arrays

2007 ◽  
Vol 989 ◽  
Author(s):  
Yuriy Vygranenko ◽  
R. Kerr ◽  
K. H. Kim ◽  
J. H. Chang ◽  
D. Striakhilev ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Amorphous Silicon ◽  
Spectral Response ◽  
Response Characteristics ◽  
Glass Substrates ◽  
Process Characterization ◽  
The Impact ◽  
Foil Substrate ◽  
Stainless Steel Foils ◽  
Steel Foils

AbstractThis paper reports the first successful attempt to fabricate amorphous silicon (a-Si:H) n-i-p photodiodes on a thin stainless-steel foil substrate for medical X-ray imaging applications. Two architectures of the n-i-p-photosensor, where the top electrode is based on amorphous or polycrystalline ITO, have been developed and characterized. The impact of critical fabrication steps including the deposition of semiconductor layers, dry etch of the NIP stack, diode passivation and encapsulation, as well as a contact formation on the device performance is presented and discussed. The test structures comprising segmented photodiodes with an active area ranged from 0.126 × 0.126 to 1 × 1 mm2 have been fabricated on stainless-steel foils and on glass substrates for the purposes of process characterization. The fabricated samples are evaluated in terms of current-voltage, capacitance-voltage, and spectral response characteristics.

scholarly journals Multiwalled carbon nanotubes synthesis from methane using a stainless steel foils as a catalyst

2020 ◽  
Vol 9 (3) ◽  
pp. 27-30
Author(s):  
Thuan Huynh Minh ◽  
Sura Nguyen ◽  
Ngan Nguyen Thi Kim ◽  
Huan Nguyen Manh ◽  
Uy Do Pham Noa ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Stainless Steel ◽  
Chemical Vapor ◽  
Treatment Temperature ◽  
Multiwalled Carbon ◽  
Nucleation Sites ◽  
Pre Treatment ◽  
20 Nm ◽  
Stainless Steel Foils ◽  
Steel Foils

In this study, a thin stainless-steel foil was used as a catalyst for carbon nanotubes (CNTs) using methane as a carbon source via the chemical vapor deposition (CVD) method. Our results revealed that pre-treatment step of the catalyst plays an important role in CNT formation. In our experiments, a catalyst pre-treatment temperature of 850 oC have been found to facilitate the surface roughness and provide more active nucleation sites for CNTs formation. Multiwalled CNTs with 6 layers, their diameters of 10 – 20 nm and their length of app. 300 nm were grown. This finding might lead to a process for improving the quality of MWCNTs grown on steel foil as catalyst.

scholarly journals Understanding Size Effects and Forming Limits in the Micro-Stamping of Industrial Stainless Steel Foils

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 38
Author(s):  
Matthias Weiss ◽  
Peng Zhang ◽  
Michael P. Pereira ◽  
Bernard F. Rolfe ◽  
Daniel E. Wilkosz ◽  
...  
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Size Effects ◽  
Bipolar Plate ◽  
Forming Limits ◽  
Tool Profile ◽  
Steel Processing ◽  
The Individual ◽  
Stainless Steel Foils ◽  
Steel Foils

This study investigates the effect of grain size and composition on the material properties and forming limits of commercially supplied stainless steel foil for bipolar plate manufacture via tensile, stretch forming and micro-stamping trials. It is shown that in commercially supplied stainless steel the grain size can vary significantly and that ‘size effects’ can be influenced by prior steel processing and composition effects. While the forming limits in micro-stamping appear to be directly linked to the plane strain forming limits of the individual stainless steel alloys, there was a clear effect of the tensile anisotropy. In contrast to previous studies, forming severity and the likelihood of material failure did not increase with a decreasing channel profile radius. This was related to inaccuracies of the forming tool profile shape.

Hot-Wire Deposited Amorphous Silicon Thin-Film Transistors

1996 ◽  
Vol 424 ◽  
Author(s):  
R. E. I. Schropp ◽  
K. F. Feenstra ◽  
C. H. M. Van Der Werf ◽  
J. Holleman ◽  
H. Meiling
Keyword(s):  
Thin Film ◽  
Amorphous Silicon ◽  
Thin Film Transistors ◽  
Gate Dielectric ◽  
Chemical Vapor ◽  
Current Crowding ◽  
Hot Wire ◽  
Saturation Regime ◽  
Silicon Thin Film ◽  
Order Of Magnitude

AbstractWe present the first thin film transistors (TFTs) incorporating a low hydrogen content (5 - 9 at.-%) amorphous silicon (a-Si:H) layer deposited by the Hot-Wire Chemical Vapor Deposition (HWCVD) technique. This demonstrates the possibility of utilizing this material in devices. The deposition rate by Hot-Wire CVD is an order of magnitude higher than by Plasma Enhanced CVD. The switching ratio for TFTs based on HWCVD a-Si:H is better than 5 orders of magnitude. The field-effect mobility as determined from the saturation regime of the transfer characteristics is still quite poor. The interface with the gate dielectric needs further optimization. Current crowding effects, however, could be completely eliminated by a H2 plasma treatment of the HW-deposited intrinsic layer. In contrast to the PECVD reference device, the HWCVD device appears to be almost unsensitive to bias voltage stressing. This shows that HW-deposited material might be an approach to much more stable devices.

Amorphous Silicon TFTs on Steel-Foil Substrates

1996 ◽  
Vol 424 ◽  
Author(s):  
S. D. Theiss ◽  
S. Wagner
Keyword(s):  
Stainless Steel ◽  
Leakage Currents ◽  
Action Current ◽  
Insulating Layer ◽  
Stainless Steel Foil ◽  
Current Voltage ◽  
Stainless Steel Foils ◽  
Steel Foils ◽  
Current Behavior

AbstractWe describe the successful fabrication of device-quality a-Si:H thin-film transistors (TFTs) on stainless-steel foil substrates. These TFTs demonstrate that transistor circuits can be made on a flexible, non-breakable substrate. Such circuits could be used in reflective or emissive displays, and in other applications that require rugged macroelectronic circuits.Two inverted TFT structures have been made, using 200 gim thick stainless steel foils with polished surfaces. In the first structure we used the substrate as the gate and utilized a homemade mask set with very large feature sizes: L = 45 μm; W = 2.5 mm. The second, inverted staggered, structure used a 9500 Å a-SiNx:H passivating/insulating layer deposited on the steel to enable the use of isolated gates. For this structure we used a mask set which is composed of TFTs with much smaller feature sizes. Both TFT structures exhibit transistor action. Current-voltage characterization of the TFTs with the inverted staggered structure shows typical on/off current ratios of 107, leakage currents on the order of 10-12 A, good linear and saturation current behavior, and channel mobilities of 0.5 cm2/V·sec. These characteristics clearly identify the TFTs grown on stainless steel foil as being of device quality.

scholarly journals Diffusion barrier properties of molybdenum back contacts for Cu(In,Ga)Se2solar cells on stainless steel foils

2013 ◽  
Vol 113 (5) ◽  
pp. 054506 ◽  
Author(s):  
P. Blösch ◽  
F. Pianezzi ◽  
A. Chirilă ◽  
P. Rossbach ◽  
S. Nishiwaki ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Diffusion Barrier ◽  
Barrier Properties ◽  
Stainless Steel Foils ◽  
Steel Foils
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