公开(公告)号：US20210226062A1

公开(公告)日：2021-07-22

申请号：US17256341

申请日：2019-06-25

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunpei YAMAZAKI ,  Haruyuki BABA ,  Naoki OKUNO ,  Yoshihiro KOMATSU ,  Toshikazu OHNO

IPC: H01L29/786 ,  H01L29/49 ,  H01L29/51

Abstract: A semiconductor device having a large on-state current and high reliability is provided. The semiconductor device includes a first insulator, a first oxide over the first insulator, a second oxide over the first oxide, a third oxide and a fourth oxide over the second oxide, a first conductor over the third oxide, a second conductor over the fourth oxide, a fifth oxide over the second oxide, a second insulator over the fifth oxide, and a third conductor over the second insulator. The fifth oxide is in contact with a top surface of the second oxide, a side surface of the first conductor, a side surface of the second conductor, a side surface of the third oxide, and a side surface of the fourth oxide. The second oxide contains In, an element M, and Zn. The first oxide and the fifth oxide each contain at least one of constituent elements included in the second oxide. The third oxide and the fourth oxide each contain the element M. The third oxide and the fourth oxide include a region where the concentration of the element M is higher than that in the second oxide.

公开(公告)号：US20210167368A1

公开(公告)日：2021-06-03

申请号：US16952189

申请日：2020-11-19

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Hiroshi KADOMA ,  Yoshihiro KOMATSU ,  Shiori SAGA ,  Shunpei YAMAZAKI

IPC: H01M4/36 ,  H01M4/525 ,  H01M4/58 ,  H01M10/0525

Abstract: A positive electrode active material in which a capacity decrease caused by charge and discharge cycles is suppressed is provided. Alternatively, a positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. The positive electrode active material contains titanium, nickel, aluminum, magnesium, and fluorine, and includes a region where titanium is unevenly distributed, a region where nickel is unevenly distributed, and a region where magnesium is unevenly distributed in a projection on its surface. Aluminum is preferably unevenly distributed in a surface portion, not in the projection, of the positive electrode active material.