Self-powered, flexible and room temperature operated solution processed hybrid metal halide p-type sensing element for efficient hydrogen detection

TL;DR

This paper introduces a novel, solution-processed hybrid perovskite film used as a flexible, self-powered hydrogen sensor capable of detecting as low as 10 ppm at room temperature, offering a simpler alternative to traditional metal oxide sensors.

Contribution

It demonstrates the first application of hybrid halide perovskite films as portable, room-temperature hydrogen sensors, highlighting their potential for safe gas detection.

Findings

Detects hydrogen down to 10 ppm at room temperature

Operates as a self-powered, flexible sensor

Introduces new gas sensing mechanisms in perovskites

Abstract

Hydrogen (H2) is a well-known reduction gas and for safety reasons is very important to be detected. The most common systems employed along its detection are metal oxide-based elements. However, the latter demand complex and expensive manufacturing techniques, while they also need high temperatures or UV light to operate effectively. In this work, we first report a solution processed hybrid mixed halide spin coated perovskite films that have been successfully applied as portable, flexible, self-powered, fast and sensitive hydrogen sensing elements, operating at room temperature. The minimum concentrations of H2 gas that could be detected was down to 10 ppm. This work provides a new pathway on gases interaction with perovskite materials, launches new questions that must be addressed regarding the sensing mechanisms involved due to the utilization of halide perovskite sensing elements while also demonstrates the potential that these materials have on beyond solar cell applications.