---
publication_id: "OT-2026-000000398"
title: "Semiconductor-Graphene Heterojunction Quad-Detectors For Low-Power Laser Alignment"
published_at: "2026-09-15T19:02:50.229733Z"
canonical_url: "https://opentechnical.org/p/OT-2026-000000398"
categories:
  - "sensors-controls-machine-vision/position-and-presence-sensing"
keywords:
  - "g01b11/272"
  - "h10f30/2877"
  - "h10f77/1465"
---

# Semiconductor-Graphene Heterojunction Quad-Detectors For Low-Power Laser Alignment

## Abstract

A semiconductor-graphene heterojunction quad-detector pairs a semiconductor material with curved graphene strips in a quad-cell design. Graphene has been shown to have exceptional electrical properties that enhance the operation of semiconductor photodetectors. These properties address limitations of current semiconductor quad-cell devices by drastically increasing their sensitivity. According to an aspect of the present disclosure, a position detector includes a substrate having windows formed therein. Four graphene pads each having a plurality of curved strips are formed on the substrate. Each of the plurality of curved strips have a first end connected to a grounded conductor pad and a second end connected to one of four signal conductor pads.