Patent ID: 11875907
Assignee: CITY LABS, INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A device for producing electricity, comprising:
in a stacked configuration:
a GaAs substrate layer;
a back-surface field layer overlying the GaAs substrate layer;
an InGaP base layer overlying the back-surface field layer and doped with a p-type dopant;
an InGaP emitter layer overlying the InGaP base layer and doped with an n-type dopant;
a window layer overlying the InGaP emitter layer;
a cap layer overlying at least a portion of the window layer;
a radioisotope source proximate or in contact with the cap layer;

a first contact in electrical contact with the back-surface field layer or with the base layer;
a second contact in electrical contact with the cap layer or with the window layer or with the emitter layer; and
wherein current is generated between the first and second contacts when connected to a load.