Fabrication of Optoelectronic Half-adder using Perovskite Multifunctional Logic Gates for Optical Computing System

Abstract

Light is attracting attention as a new data transmission medium due to its advantages, such as high data processing speed, high bandwidth in the terahertz region, low heat generation, etc. Accordingly, the necessity for optoelectronic logic circuits using an optical transmission medium is increasing to overcome the traditional logic circuit limitation based on electronic transistors. In this research, we fabricated a perovskite multifunctional logic gate based on a back-to-back structure photodetector with bipolar photoresponse characteristics. In the perovskite multifunctional logic gate, a wide-bandgap perovskite layer is deposited by a one-step solution process to absorb visible light. Additionally, a narrow-bandgap perovskite layer, which absorbs near-infrared light, is deposited using a two-step conversion process that consisting of a single source thermal evaporation process and a solution conversion process. We demonstrate an optoelectronic half adder, which operates with only light, by constructing a combinational logic circuit with three perovskite multifunctional logic gates and one bridge rectifier.