Patent ID: 8414187

Claim:
A method for measuring a temperature with a temperature sensor, the method comprising steps of: a step (a) of preparing the temperature sensor, wherein: the temperature sensor comprises a lower electrode group, a ferroelectric layer having polarization, a semiconductor layer, and an upper electrode group, the ferroelectric layer is disposed between the lower electrode group and the semiconductor layer and the semiconductor layer is disposed between the ferroelectric layer and the upper electrode group, the lower electrode group comprises a first lower electrode and a second lower electrode, the upper electrode group comprises a first upper electrode, a second upper electrode, and a third upper electrode, the second upper electrode is interposed between the first upper electrode and the third upper electrode in a plan view, a first ferroelectric part of the ferroelectric layer is interposed between the first lower electrode and the first upper electrode, a second ferroelectric part of the ferroelectric layer is interposed between the second lower electrode and the third upper electrode, the second ferroelectric part has an inverted polarization direction of the polarization direction of the first ferroelectric part, and the semiconductor layer includes a first channel disposed between the first upper electrode and the second upper electrode, and a second channel disposed between the second upper electrode and the third upper electrode; a step (b) of applying a voltage V DD and a voltage of 0V to the first upper electrode and the third upper electrode, respectively, to measure an output voltage V OUT from the second upper electrode; and a step (c) of calculating the temperature from the following equation (2): T = { ( R d ⁢ ⁢ 1 + R u ⁢ ⁢ 1 ) ⁢ T 2 - ( R d ⁢ ⁢ 2 + R u ⁢ ⁢ 2 ) ⁢ T 1 } ⁢ V out + ( R u ⁢ ⁢ 2 ⁢ T 1 - R u ⁢ ⁢ 1 ⁢ T 2 ) ⁢ V DD ( R d ⁢ ⁢ 1 - R d ⁢ ⁢ 2 + R u ⁢ ⁢ 1 - R u ⁢ ⁢ 2 ) ⁢ V out + ( R u ⁢ ⁢ 2 - R u ⁢ ⁢ 1 ) ⁢ V DD ( 2 ) where, R d1 represents a resistance value of the first channel when temperature T of the ferroelectric layer is T 1 , R u1 represents a resistance value of the second channel when the temperature T of the ferroelectric layer is T 1 , R d2 represents a resistance value of the first channel when the temperature T of the ferroelectric layer is T 2 , and R u2 represents a resistance value of the second channel when the temperature T of the ferroelectric layer is T 2 .