Transition metal dichalcogenides (TMDs) are promising candidates for flexible optoelectronic devices because of their special structures and excellent properties, but the low optical absorption of the ultrathin layers greatly limits the generation of photocarriers and restricts the performance. Here, we integrate all-inorganic perovskite CsPbBr nanosheets with MoS atomic layers and take the advantage of the large absorption coefficient and high quantum efficiency of the perovskites, to achieve excellent performance of the TMD-based photodetectors. Significantly, the interfacial charge transfer from the CsPbBr to the MoS layer has been evidenced by the observed photoluminescence quenching and shortened decay time of the hybrid MoS/CsPbBr. Resultantly, such a hybrid MoS/CsPbBr photodetector exhibits a high photoresponsivity of 4.4 A/W, an external quantum efficiency of 302%, and a detectivity of 2.5 × 10 Jones because of the high efficient photoexcited carrier separation at the interface of MoS and CsPbBr. The photoresponsivity of this hybrid device presents an improvement of 3 orders of magnitude compared with that of a MoS device without CsPbBr. The response time of the device is also shortened from 65.2 to 0.72 ms after coupling with MoS layers. The combination of the all-inorganic perovskite layer with high photon absorption and the carrier transport TMD layer may pave the way for novel high-performance optoelectronic devices.
Mechanoluminescence (ML) is one of the most important routes to realize remote sensing of stress distribution, but has never been used in temperature sensing. Traditionally, stress sensing and temperature sensing are separately realized through different methods in multifunctional sensors, which definitely makes the structure more complicated. In this work, the remote stress-temperature dual-modal sensing is proposed by using the double-lanthanide-activated ML material SrZnSO:Tb,Eu, where the stress is read by the integral intensity of ML and the temperature is displayed by the green to red emission ratio (I Tb /I Eu ) of ML in one material. The dual sensing mode in SrZnSO:Tb,Eu enables building of a new imaging system, providing a facile, reliable, and more sensitive way to remotely visualize the distribution of stress and temperature. It opens up a novel approach to develop advanced artificial skins with simplified structures in human-machine interfaces, structural health monitoring, and biomedical engineering applications.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.