영어에서 The oxide semiconductor 을 사용하는 예와 한국어로 번역
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nitrogen in the multilayer film 111 including the oxide semiconductor layer is preferably reduced as much as possible; the concentration of nitrogen is preferably set to,
In other words, a feature of an embodiment of the present invention is that the oxide semiconductor itself is refined by sufficiently supplying oxygen to remove water or hydrogen that forms the donor level and also to remove oxygen defects.
dehydration or dehydrogenation of the oxide semiconductor layer can be achieved; Therefore, water(H 2 O) can be prevented from
For this reason, nitrogen in the oxide semiconductor film is preferably reduced as much as possible; the concentration of
is used for the oxide semiconductor film 359,
As described above, the oxide semiconductor film can be highly purified through the treatment for supplying oxygen such as the second heat treatment or the third heat treatment after the dehydrogenation treatment by the first heat treatment.
As described above, the oxide semiconductor film including a crystalline region has favorable crystallinity as compared to an oxide semiconductor film which is entirely amorphous,
is used for the oxide semiconductor film 359,
The oxide semiconductor film 393 is formed on the substrate 394 as follows:
obtain a single crystal material; for example, crystal growth at a temperature extremely higher than a process temperature of the oxide semiconductor is needed or epitaxial growth over a special substrate is needed.
The oxide semiconductors and 4H-SiC have some commonalities.
As a material for the oxide semiconductor, a material containing zinc oxide and zinc oxide as its components is known.
Wherein electron affinity of the oxide semiconductor layer is higher than electron affinity of the first oxide layer by 0.2 eV or more.
In this case, it is preferable to remove the residual moisture in the treatment chamber in the film formation of the oxide semiconductor film 345.
Note that the appropriate thickness of the second oxide semiconductor layer differs depending on the oxide semiconductor material to be used, the usage of the semiconductor device, or the like;
For example, crystal growth at a temperature extremely higher than a process temperature of the oxide semiconductor is needed or epitaxial growth over a special substrate is needed.