Precision Control of Amphoteric Doping in Cu_(x)Bi_(2)Se_(3) Nanoplates  

作　　者：Huaying Ren Jingxuan Zhou Ao Zhang Zixi Wu Jin Cai Xiaoyang Fu Jingyuan Zhou Zhong Wan Boxuan Zhou Yu Huang Xiangfeng Duan 

机构地区：[1]Department of Chemistry and Biochemistry,University of California,Los Angeles,Los Angeles,California 90095,United States [2]Department of Materials Science and Engineering,University of California,Los Angeles,Los Angeles,California 90095,United States [3]Department of Materials Science and Engineering and California NanoSystems Institute,University of California,Los Angeles,Los Angeles,California 90095,United States [4]California NanoSystems Institute,University of California,Los Angeles,Los Angeles,California 90095,United States

出　　处：《Precision Chemistry》2024年第8期421-427,共7页精准化学（英文）

基　　金：the UCLA California NanoSystem Institute(CNSI)Noble Family Innovation Fund for material preparation;partial support from the National Science Foundation through grant number 2329192 for transport studies and analysis.

摘　　要：Copper-doped Bi_(2)Se_(3)(Cu_(x)Bi_(2)Se_(3))is of considerable interest for tailoring its electronic properties and inducing exotic charge correlations while retaining the unique Dirac surface states.However,the copper dopants in Cu_(x)Bi_(2)Se_(3) display complex electronic behaviors and may function as either electron donors or acceptors depending on their concentration and atomic sites within the Bi_(2)Se_(3) crystal lattice.Thus,a precise understanding and control of the doping concentration and sites is of both fundamental and practical significance.Herein,we report a solution-based one-pot synthesis of Cu_(x)Bi_(2)Se_(3) nanoplates with systematically tunable Cu doping concentrations and doping sites.Our studies reveal a gradual evolution from intercalative sites to substitutional sites with increasing Cu concentrations.The Cu atoms at intercalative sites function as electron donors while those at the substitutional sites function as electron acceptors,producing distinct effects on the electronic properties of the resulting materials.We further show that Cu_(0.18)Bi_(2)Se_(3) exhibits superconducting behavior,which is not present in Bi_(2)Se_(3),highlighting the essential role of Cu doping in tailoring exotic quantum properties.This study establishes an efficient methodology for precise synthesis of Cu_(x)Bi_(2)Se_(3) with tailored doping concentrations,doping sites,and electronic properties.

关 键 词：Cu_(x)Bi_(2)Se_(3) NANOPLATES amphoteric doping solution-based synthesis doping sites conducting thin film superconductivity 

分 类 号：O61[理学—无机化学]