Synthesis and enhanced piezoelectric response of CVD-grown SnSe layered nanosheets for flexible nanogenerators  

作　　者：Fumei Yang Man-Chung Wong Jianfeng Mao Zehan Wu Jianhua Hao 

机构地区：[1]Department of Applied Physics,the Hong Kong Polytechnic University,Hong Kong 999077,China

出　　处：《Nano Research》2023年第9期11839-11845,共7页纳米研究（英文版）

基　　金：supported by the grants from Research Grants Council of Hong Kong(Nos.GRF PolyU 153025/19P,SRFS2122-5S02,and AoE/P-701/20);PolyU Otto Poon Charitable Foundation Research Institute for Smart Energy(No.Q-CDBD).

摘　　要：Piezoelectricity is the electric charge which accumulates in certain materials in response to mechanical stimuli,while piezoelectric nanogenerators(PENGs)converting mechanical energy into electricity can be widely used for energy harvesting and self-powered systems.The group IV-VI monochalcogenides may exhibit strong piezoelectricity because of their puckered C_(2v)symmetry and electronic structure,making them promising for flexible PENG.Herein,we investigated the synthesis and piezoelectric properties of multilayer SnSe nanosheets grown by chemical vapor deposition(CVD).The SnSe nanosheets exhibited high single-crystallinity,large area,and good stability.The strong layer-dependent in-plane piezoelectric coefficient of SnSe nanosheets showed a saturated trend to be~110 pm/V,which overcomes the weak piezoelectric response or odd-even effects in other layered nanosheets.A high energy conversion efficiency of 9.3%and a maximum power density of 538 mW/cm^(2)at 1.03%strain have been demonstrated in a SnSe-based PENG.Based on the enhanced piezoelectricity of SnSe and attractive output performance of the nanogenerator,a self-powered sensor for human motion monitoring is further developed.These results demonstrate the strong piezoelectricity in high quality CVD-grown SnSe nanosheets,allowing for application in flexible smart piezoelectric sensors and advanced microelectromechanical devices.

关 键 词：SnSe piezotronics piezoresponse force microscope piezoelectric nanogenerator self-powered device 

分 类 号：TB383[一般工业技术—材料科学与工程]