Chen Hongjun, Zhang Meng, Bo Renheng, Barugkin Chog, Zheng Jianghui, Ma Qingshan, Huang Shujuan, Ho-Baillie Anita W Y, Catchpole Kylie R, Tricoli Antonio
Nanotechnology Research Laboratory, Research School of Engineering, Australian National University, Canberra, 2601, Australia.
Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, 2052, Australia.
Small. 2018 Feb;14(7). doi: 10.1002/smll.201702571. Epub 2017 Dec 27.
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.
混合卤化物钙钛矿是一种很有前景的光吸收材料，并且针对许多光电子应用进行了深入研究。在此，展示了首个用于室温下可见光照射下化学气体传感的自供电无机卤化物钙钛矿原型。这些器件由CsPbBr（CPB）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氧气以及百万分之一浓度的医学相关挥发性有机化合物，如丙酮和乙醇，响应和恢复时间非常快。据观察，氧气可以钝化CPB中的表面陷阱位点，并且与对氧化和还原气体具有对称电响应的已确立半导体相比，钙钛矿层中的双极性电荷传输导致了独特的传感机制。基于CPB的气体传感器平台为可穿戴传感器在个性化和预防医学这一新兴领域提供了新的见解。
