MUMBAI, India, June 20 -- Intellectual Property India has published a patent application (202517046174 A) filed by Adachi Electric Industry Co., Tokyo, on May 14, for 'compound solar battery.'

Inventor(s) include Oku Shinji; and Nakata Yoshitomo.

The application for the patent was published on June 20, under issue no. 25/2025.

According to the abstract released by the Intellectual Property India: "A compound solar battery according to the present invention is provided with a laminated film (2) including: a reflection layer (20) formed of an AlGaAs layer; a front surface-side light absorption layer (10) formed between a surface electrode (1) and the reflection layer (20); and a back surface-side light absorption layer (30) formed between the reflection layer (20) and a substrate (3). The reflection layer (20) is formed of a front surface-side reflection layer (20u) and a back surface-side reflection layer (20d). The Al content ratio in the front surface-side reflection layer (20u) is set to be greater than that in the back surface-side reflection layer (20d). The back surface-side light absorption layer (30) is formed by laminating, from the substrate (3) side, a first InGaP layer (31), a first GaAs layer (32), a second InGaP layer (33), a second GaAs layer (34), and a third InGaP layer (35). The thickness of the second GaAs layer (34) is set to be larger than that of the first GaAs layer (32)."

The patent application was internationally filed on Nov. 06, 2023, under International application No.PCT/JP2023/039830.

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