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Transistor, semiconductor device, and electronic device

專利號(hào)
US10096720B2
公開日期
2018-10-09
申請(qǐng)人
Semiconductor Energy Laboratory Co., Ltd.（JP Atsugi-shi, Kanagawa-ken）
發(fā)明人
Yoshinori Ando
IPC分類
H01L27/12; H01L29/786; H01L29/66
技術(shù)領(lǐng)域
layer,transistor,insulating,electrode,in,109_1b,oxide,be,or,wiring
地域： Atsugi-shi, Kanagawa-ken

摘要

To provide a semiconductor device with high design flexibility. A first transistor and a second transistor having different electrical characteristics from those of the first transistor are provided over the same layer without significantly increasing the number of manufacturing steps. A semiconductor layer where a channel of the first transistor is formed and a semiconductor layer where a channel of the second transistor is formed are formed using semiconductor materials having different electron affinities. When an oxide semiconductor is used for the semiconductor layer, an insulating layer containing excess oxygen is used as an insulating layer below the semiconductor layer. By increasing the thickness of the insulating layer, a large amount of oxygen can be supplied to the semiconductor layer.

說明書

In FIG. 7A, Ec382, Ec383a, Ec383b, Ec383c, and Ec386 indicate the energy of the conduction band minimum of the insulating layer 108, the semiconductor layer 109_1a, the semiconductor layer 109_1b, the semiconductor layer 109_1c, and the insulating layer 111_1, respectively.

Here, an electron affinity corresponds to a value obtained by subtracting an energy gap from a difference in energy between the vacuum level and the valence band maximum (the difference is also referred to as “ionization potential”). The energy gap can be measured using a spectroscopic ellipsometer (UT-300 manufactured by HORIBA Jobin Yvon SAS). The energy difference between the vacuum level and the valence band maximum can be measured using an ultraviolet photoelectron spectroscopy (UPS) device (VersaProbe manufactured by ULVAC-PHI, Inc.)

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