摘要:
In a thin film transistor which uses an oxide semiconductor, buffer layers containing indium, gallium, zinc, oxygen, and nitrogen are provided between the oxide semiconductor layer and the source and drain electrode layers.
摘要:
An electrode formed using a transparent conductive oxide is likely to be crystallized by heat treatment performed in the manufacturing process of a semiconductor device. In the case of a thin film element using an electrode having a significantly uneven surface due to crystallization, a short circuit is likely to occur and thus reliability of the element is degraded. An object is to provide a light-transmitting conductive oxynitride which is not crystallized even if subjected to heat treatment and a manufacturing method thereof. It is found that an oxynitride containing indium, gallium, and zinc, to which hydrogen atoms are added as impurities, is a light-transmitting conductive film which is not crystallized even if heated at 350° C. and the object is achieved.
摘要:
An object is to provide a thin film transistor using an oxide semiconductor layer, in which contact resistance between the oxide semiconductor layer and source and drain electrode layers is reduced and electric characteristics are stabilized. Another object is to provide a method for manufacturing the thin film transistor. A thin film transistor using an oxide semiconductor layer is formed in such a manner that buffer layers having higher conductivity than the oxide semiconductor layer are formed over the oxide semiconductor layer, source and drain electrode layers are formed over the buffer layers, and the oxide semiconductor layer is electrically connected to the source and drain electrode layers with the buffer layers interposed therebetween. In addition, the buffer layers are subjected to reverse sputtering treatment and heat treatment in a nitrogen atmosphere, whereby the buffer layers having higher conductivity than the oxide semiconductor layer are obtained.
摘要:
An object is to provide a thin film transistor using an oxide semiconductor layer, in which contact resistance between the oxide semiconductor layer and source and drain electrode layers is reduced and electric characteristics are stabilized. The thin film transistor is formed in such a manner that a buffer layer including a high-resistance region and low-resistance regions is formed over an oxide semiconductor layer, and the oxide semiconductor layer and source and drain electrode layers are in contact with each other with the low-resistance region of the buffer layer interposed therebetween.
摘要:
An object is to provide a thin film transistor including an oxide semiconductor layer, in which the contact resistance between the oxide semiconductor layer and source and drain electrode layers is reduced and whose electric characteristics are stabilized. Another object is to provide a method for manufacturing the thin film transistor. The thin film transistor including an oxide semiconductor layer is formed in such a manner that buffer layers whose conductivity is higher than that of the oxide semiconductor layer are formed and the oxide semiconductor layer and the source and drain electrode layers are electrically connected to each other through the buffer layers. In addition, the buffer layers whose conductivity is higher than that of the oxide semiconductor layer are subjected to reverse sputtering treatment and heat treatment in a nitrogen atmosphere.
摘要:
The silicon nitride layer 910 formed by plasma CVD using a gas containing a hydrogen compound such as silane (SiH4) and ammonia (NH3) is provided on and in direct contact with the oxide semiconductor layer 905 used for the resistor 354, and the silicon nitride layer 910 is provided over the oxide semiconductor layer 906 used for the thin film transistor 355 with the silicon oxide layer 909 serving as a barrier layer interposed therebetween. Therefore, a higher concentration of hydrogen is introduced into the oxide semiconductor layer 905 than into the oxide semiconductor layer 906. As a result, the resistance of the oxide semiconductor layer 905 used for the resistor 354 is made lower than that of the oxide semiconductor layer 906 used for the thin film transistor 355.
摘要:
Provided is a method for manufacturing a power storage device in which a crystalline silicon layer including a whisker-like crystalline silicon region is formed as an active material layer over a current collector by a low-pressure CVD method in which heating is performed using a deposition gas containing silicon. The power storage device includes the current collector, a mixed layer formed over the current collector, and the crystalline silicon layer functioning as the active material layer formed over the mixed layer. The crystalline silicon layer includes a crystalline silicon region and a whisker-like crystalline silicon region including a plurality of protrusions which project over the crystalline silicon region. With the protrusions, the surface area of the crystalline silicon layer functioning as the active material layer can be increased.
摘要:
A normally-off transistor having an oxide semiconductor layer in a channel formation layer is provided. The transistor comprises: a first oxide semiconductor layer functioning as a channel formation region; a source electrode layer and a drain electrode layer which overlap with the first oxide semiconductor layer; a gate insulating layer which is provided over and in contact with the first oxide semiconductor layer, the source electrode layer, and the drain electrode layer; a second oxide semiconductor layer which is provided over and in contact with the gate insulating layer and overlaps with the first oxide semiconductor layer; and a gate electrode layer provided over the second oxide semiconductor layer. A manufacturing method thereof is also disclosed.