Wrinkled 2D Materials for Stretchable Optoelectronic Devices

Stretchable, flexible, and bendable devices are an emerging class of future wearable technology, which have attracted considerable attentions, including all kinds of electronic and optoelectronic devices. Particularly, because of the excellent mechanical flexibility, 2D materials and quantum dots/disks (QDs) such as graphene, TMDCs, MoS₂ QDs, and CQDs are suitable to provide high stability and durability in the fabrication of stretchable devices. However, in terms of 2D based optoelectronic devices, the photoresponsivity and luminousness are low and weak owing to weak absorption of their few-layered thickness. To overcome this shortcoming, herein, the wrinkled 2D materials based stretchable optoelectronic devices such as highly sensitive and stretchable hybrid 2D heterostructured and wrinkled photodetectors based on MoS₂ QDs/graphene, and all-carbon stretchable and cavity-free white lasers have been designed and demonstrated. The underlying mechanism can be attributed to the fact that the wrinkled structure is useful to induce light trapping effect, generate more electron-hole pairs and enhance photosensitivity for photodetectors. On the other hand, the emissive light from the crumpled structure of CQDs/graphene can be trapped and enhanced to achieve population inversion with the multiple scatterings in between the crumpled graphene structures. Therefore, our results open new excellent possibilities for developments of future stretchable and wearable optoelectronic devices.