Publications

@article{Feng2021-bt,

title = {Plasmonic and graphene-functionalized high-performance broadband 

 quasi-two-dimensional perovskite hybrid photodetectors},

author = {Fu Feng and Tao Wang and Jie Qiao and Changjun Min and Xiaocong Yuan and Michael Somekh},

year  = {2021},

date = {2021-12-01},

journal = {ACS Appl. Mater. Interfaces},

volume = {13},

number = {51},

pages = {61496\textendash61505},

publisher = {American Chemical Society (ACS)},

abstract = {Quasi-two-dimensional (2D) layered organic-inorganic hybrid 

 perovskites have attracted extensive attention, owing to their 

 excellent optoelectronic tunability and moisture stability 

 compared with three-dimensional perovskite counterparts and show 

 great potential for application in photodetectors (PDs). 

 However, owing to the unavoidable grain boundary defects of 

 perovskite polycrystalline films, the photocurrent is limited by 

 poor light absorption and charge mobility. Therefore, the 

 preparation of quasi-2D perovskite films with strong light 

 trapping and high charge mobility has been challenging. In this 

 study, novel broadband quasi-2D perovskite (BA)2(FA)n-1PbnI3n+1 

 hybrid-structure PDs with good stability were fabricated by 

 combining both monolayer graphene and Au square nanoarrays. The 

 hybrid system using both graphene and Au square nanoarrays 

 effectively improved the carrier mobility and light absorption 

 and simultaneously maximized light trapping and light-induced 

 carrier extraction, which resulted in PDs with greatly enhanced 

 photocurrent in the visible and near-infrared range. The 

 graphene-Au array-perovskite-based PDs had a low dark current of 

 10-10 A, large on/off ratio of 104, high responsivity of 18.71 A 

 W-1, and detectivity of 2.21 $times$ 1013 Jones. The 

 responsivity and detectivity were two orders of magnitude higher 

 than those of PDs based only on perovskites. This work 

 demonstrates a promising and feasible device based on the 

 coupling of a gold array, layered graphene, and quasi-2D 

 perovskites, which shows great potential for the development of 

 high-performance broadband perovskite PDs.},

keywords = {film, graphene, light trapping, photodetector, plasmonic, quasi-2D perovskite},

pubstate = {published},

tppubtype = {article}

}

@article{Qiao2021-cu,

title = {Highly in-plane anisotropic two-dimensional ternary Ta2NiSe5 

 for polarization-sensitive photodetectors},

author = {Jie Qiao and Fu Feng and Ziming Wang and Mengyan Shen and Guoping Zhang and Xiaocong Yuan and Michael G Somekh},

year  = {2021},

date = {2021-04-01},

journal = {ACS Appl. Mater. Interfaces},

volume = {13},

number = {15},

pages = {17948\textendash17956},

publisher = {American Chemical Society (ACS)},

abstract = {Intriguing anisotropic electrical and optoelectrical properties 

 in two-dimensional (2D) materials are currently gaining 

 increasing interest both for fundamental research and emerging 

 optoelectronic devices. Identifying promising new 2D materials 

 with low-symmetry structures will be rewarding in the 

 development of polarization-integrated nanodevices. In this 

 work, the anisotropic electron transport and optoelectrical 

 properties of multilayer 2D ternary Ta2NiSe5 were systematically 

 researched. The polarization-sensitive Ta2NiSe5 photodetector 

 shows a linearly anisotropy ratio of $approx$3.24 with 1064 nm 

 illumination. The multilayer Ta2NiSe5-based field-effective 

 transistors exhibit an excellent field-effective mobility of 

 161.25 cm2·V-1·s-1 along the a axis (armchair direction) as well 

 as a great current saturation characteristic at room 

 temperature. These results will promote a better understanding 

 of the optoelectrical properties and applications in new 

 categories of the in-plane anisotropic 2D materials.},

keywords = {field-effective transistors, in-plane anisotropy, photodetector, polarization-sensitive photodetector, Ta2NiSe5},

pubstate = {published},

tppubtype = {article}

}