标题：High-performance room-temperature NO2 sensors based on CH3NH3PbBr3 semiconducting films: Effect of surface capping by alkyl chain on sensor performance
作者：Zhu, Ruimin ;Zhang, Yingze ;Zhong, Hao ;Wang, Xinlong ;Xiao, Hao ;Chen, Yanli ;Li, Xiyou
作者机构：[Zhu, Ruimin ;Zhang, Yingze ;Zhong, Hao ;Wang, Xinlong ;Xiao, Hao ;Chen, Yanli ;Li, Xiyou ] School of Material Science and Technology, Institute of Ne 更多
来源：Journal of Physics and Chemistry of Solids
摘要：High-performance CH3NH3PbBr3 (MAPbBr3) room-temperature NO2 sensors have been developed for the first time based on MAPbBr3 films prepared directly from perovskite precursor solutions (PSFs) and from surface-capped MAPbBr3 nanoparticles (NPFs). AFM images of these films revealed that the grain size of MAPbBr3 crystal in PSFs decreases with the increasing on the concentration of precursor solution, and XRD patterns demonstrate MAPbBr3 in PSFs packed along with (00l) crystal orientation. However, MAPbBr3 NPFs have no preferential crystal orientation despite the good crystallinity of MAPbBr3 NPs. I-V curves revealed different hysteresis loops for these two kinds of films. Sensors with PSF or NPF as semiconducting layer exhibited remarkable and reversible change when they are exposed to NO2 gas. Interestingly, NPF sensors show better sensing performance with a lower detection limit (0.1 ppm) and a larger sensitivity. Experiments also revealed that the selectivity of NPF is better than that of PSF sensors. More importantly, NPF sensors are much more stable than PSF sensors due to the protected surface of perovskite NPs. This study opens a new promising application for organometallic halide perovskite materials, especially for the protected perovskite NPs.
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