Superior Self‐Powered Room‐Temperature Chemical Sensing with Light‐Activated Inorganic Halides Perovskites

Abstract

Hybrid halide perovskite is one of the promising light absorber and is intensively investigated for many optoelectronic applications. Here, the first prototype of a self-powered inorganic halides perovskite for chemical gas sensing at room temperature under visible-light irradiation is presented. These devices consist of porous network of CsPbBr (CPB) and can generate an open-circuit voltage of 0.87 V under visible-light irradiation, which can be used to detect various concentrations of O and parts per million concentrations of medically relevant volatile organic compounds such as acetone and ethanol with very quick response and recovery time. It is observed that O gas can passivate the surface trap sites in CPB and the ambipolar charge transport in the perovskite layer results in a distinct sensing mechanism compared with established semiconductors with symmetric electrical response to both oxidizing and reducing gases. The platform of CPB-based gas sensor provides new insights for the emerging area of wearable sensors for personalized and preventive medicine.

Superior Self‐Charged and ‐Powered Chemical Sensing with High Performance for NO2 Detection at Room Temperature

“…We have recently reported one of the first self‐powered chemical sensor for the detection of volatile organic compounds (VOCs) using visible light‐activated inorganic halide perovskites at room temperature. [ 12 ] Notably, we have observed that the metal halide perovskite plays a dual role as both the active gas sensing material and as effective environment light harvester, capable of self‐powered sensing without any applied external bias. [ 12 ] Although such self‐powered chemical sensors are progressing rapidly, [ 4,5,12 ] a major challenge is achieving excellent performance for certain gas and their self‐powered use in dark conditions when light irradiation is temporarily unavailable.…”

“…[ 12 ] Notably, we have observed that the metal halide perovskite plays a dual role as both the active gas sensing material and as effective environment light harvester, capable of self‐powered sensing without any applied external bias. [ 12 ] Although such self‐powered chemical sensors are progressing rapidly, [ 4,5,12 ] a major challenge is achieving excellent performance for certain gas and their self‐powered use in dark conditions when light irradiation is temporarily unavailable. [ 5,12 ] To address the need of continuous power supply, energy storage components, such as lithium ion batteries and supercapacitors, have been integrated with perovskite solar cells to achieve fully self‐powered devices, such as photo‐supercapacitor and perovskite photovoltachromic supercapacitor.…”

“…[ 12 ] Although such self‐powered chemical sensors are progressing rapidly, [ 4,5,12 ] a major challenge is achieving excellent performance for certain gas and their self‐powered use in dark conditions when light irradiation is temporarily unavailable. [ 5,12 ] To address the need of continuous power supply, energy storage components, such as lithium ion batteries and supercapacitors, have been integrated with perovskite solar cells to achieve fully self‐powered devices, such as photo‐supercapacitor and perovskite photovoltachromic supercapacitor. [ 13 ] Although these approaches can provide a continuous power supply, their integration increase device size, complexity, and cost.…”

“…[ 6 ] It was found that all amine containing functional layers show high NO 2 selectivity. Here, the FA cation of the FMCPIB contains primary and secondary amine, and the MA cation contains primary amine groups and it has also found that there is no good sensor response for NO 2 on inorganic CsPbBr 3 and CsPbBr 2 I perovskite sensors, [ 12,24 ] indicating that the chemical sensing performance is closely correlated with the cation of perovskites. It also known that a predominantly electron‐donor character is usually observed for the amine‐NO 2 system.…”

A Water Dissolvable Electrolyte with an Ionic Liquid for Eco‐Friendly Electronics

“…Some ILs are known to form a gel when suspended in eco‐friendly polymers, including poly(vinyl alcohol) (PVA), poly(ethylene oxide) (PEO), and poly(ethylene glycol) (PEG) . Owing to such characteristics, the use of ILs is not limited to the electrolyte of high capacity batteries but also applicable to functional devices such as photovoltaics, energy storages, and tactile sensors . Nonetheless, some ILs have toxicity or nonbiodegradability that hinder their disposable use.…”