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 CsPbBr₃ (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 O₂ 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 O₂ 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.

中文翻译：

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具有光活化无机卤化物钙钛矿的高级自供电室温化学感测

混合卤化物钙钛矿是有前途的光吸收剂之一，并已在许多光电应用中进行了深入研究。在这里，展示了用于室温下可见光照射下化学气体感测的自供电无机卤化物钙钛矿原型。这些设备由CsPbBr ₃（CPB）的多孔网络组成，在可见光照射下可产生0.87 V的开路电压，可用于检测各种浓度的O ₂和百万分之几的医疗相关挥发性有机物丙酮和乙醇等化合物，具有非常快的响应和恢复时间。观察到O ₂气体可以钝化CPB中的表面陷阱，钙钛矿层中的双极性电荷传输会导致与成熟的半导体（具有对氧化性气体和还原性气体对称的电响应）相比具有独特的传感机制。基于CPB的气体传感器平台为针对个性化和预防医学的可穿戴传感器的新兴领域提供了新见解。