PbSe materials,with their narrow bandgap,excellent optical absorption and outstanding optical response,are ideal for infrared photodetectors,exhibiting unique advantages in optical communication,infrared imaging and t...PbSe materials,with their narrow bandgap,excellent optical absorption and outstanding optical response,are ideal for infrared photodetectors,exhibiting unique advantages in optical communication,infrared imaging and thermal detection.Nevertheless,PbSe typically has a non-layered crystal structure and inherent isotropy,making the synthesis of low-dimensional nanomaterials challenging.Besides,PbSe photoconductive detectors suffer from high dark current due to intrinsic defects and thermally excited carriers,which is detrimental to device performance.Here,we utilized physical vapor deposition(PVD)method to grow high-quality PbSe nanosheets and combined them with two-dimensional(2D)transition metal dichalcogenides(TMDs)material WSe_(2)to fabricate a self-powered PbSe/WSe_(2)p-n heterostructure photodetector.Under illumination with a 650 nm laser at a power density of 128.97 mW/cm^(2)and 0 V bias,the PbSe/WSe_(2)heterojunction device exhibited significant photovoltaic characteristics and generated a short-circuit current of 161.7 nA.Furthermore,under 0.02 mW/cm^(2)of 650 nm laser illumination at 0 V bias,the device achieved an excellent responsivity(R)of 15.6 A/W and a specific detectivity(D^(*))of 1.08×10^(11)Jones.And the response speed of the heterojunction device at 0 V(511µs/74µs)was three orders of magnitude faster than that of PbSe nanosheets(93 ms/104 ms).The device also demonstrated broadband detection capabilities from 405 nm to 1550 nm and excellent imaging performance in the near-infrared region at 0 V bias.In summary,the outstanding photoelectric detection performance and imaging capabilities of the PbSe/WSe_(2)heterojunction nanosheet detector indicate its significant potential for applications in miniaturized,low-noise,broadband,high-speed and high-performance photodetectors.展开更多
文中展示了一种基于IGZO/NiO/PbSe纳米带阵列异质结结构的双极结型红外光电晶体管作为先进的快速光敏核心,能够满足近红外药液检测的需求。其中,PbSe纳米带阵列可以增强探测器对于红外波段的光吸收,加强光生载流子的收集。实验表明该晶...文中展示了一种基于IGZO/NiO/PbSe纳米带阵列异质结结构的双极结型红外光电晶体管作为先进的快速光敏核心,能够满足近红外药液检测的需求。其中,PbSe纳米带阵列可以增强探测器对于红外波段的光吸收,加强光生载流子的收集。实验表明该晶体管具有高动态探测率(1.14×10^(12)Jones)和高响应度(4100 A/W)的优点,能够完美兼容自主设计的高精度差分负反馈锁相放大电路,通过观察到检测出的二次谐波(Twice the Fundamental Frequency,2f)信号的振幅与溶质之间存在良好的线性关系,继而能够准确推断出药液中溶质的种类和浓度信息。展开更多
PbSe nanoparticles with dendrites have been prepared by sonoelectrochemical method from an aqueous solution containing Pb(Ac)2 and Na2SeSO3 in the presence of Trisodium Citrate (TSC). The nanoparticles were characteri...PbSe nanoparticles with dendrites have been prepared by sonoelectrochemical method from an aqueous solution containing Pb(Ac)2 and Na2SeSO3 in the presence of Trisodium Citrate (TSC). The nanoparticles were characterized by using powder X ray diffraction (XRD), transmission electron microscope (TEM) and X ray photoelectron spectroscopy(XPS). XRD patterns show the presence of diffraction peaks corresponding to the (111), (200),(220), (311), (222) planes of cubic PbSe. The TEM image shows dendrits PbSe in the presence of TSC, while in the presence of Potassium Nitrilotriacetate(NTA) the TEM image shows monodisperse spherical nanoparticles with an average size of 20nm. The effects of electrolysis and complexing agents on particle size and shape were also discussed.展开更多
基金supported financially by National Key Research and Development Program of China(No.2023YFB3611400)National Natural Science Foundation of China(Nos.62175026,62305047)+4 种基金China National Postdoctoral Program for Innovative Talents(No.BX20230059),China Postdoctoral Science Foundation(No.2023M740509)Guangdong Basic and Applied Basic Research Foundation(No.2024A1515010005)National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Research Foundation(No.NKLIPR2315)Natural Science Foundation of Sichuan Province(No.24NSFSC1465).
文摘PbSe materials,with their narrow bandgap,excellent optical absorption and outstanding optical response,are ideal for infrared photodetectors,exhibiting unique advantages in optical communication,infrared imaging and thermal detection.Nevertheless,PbSe typically has a non-layered crystal structure and inherent isotropy,making the synthesis of low-dimensional nanomaterials challenging.Besides,PbSe photoconductive detectors suffer from high dark current due to intrinsic defects and thermally excited carriers,which is detrimental to device performance.Here,we utilized physical vapor deposition(PVD)method to grow high-quality PbSe nanosheets and combined them with two-dimensional(2D)transition metal dichalcogenides(TMDs)material WSe_(2)to fabricate a self-powered PbSe/WSe_(2)p-n heterostructure photodetector.Under illumination with a 650 nm laser at a power density of 128.97 mW/cm^(2)and 0 V bias,the PbSe/WSe_(2)heterojunction device exhibited significant photovoltaic characteristics and generated a short-circuit current of 161.7 nA.Furthermore,under 0.02 mW/cm^(2)of 650 nm laser illumination at 0 V bias,the device achieved an excellent responsivity(R)of 15.6 A/W and a specific detectivity(D^(*))of 1.08×10^(11)Jones.And the response speed of the heterojunction device at 0 V(511µs/74µs)was three orders of magnitude faster than that of PbSe nanosheets(93 ms/104 ms).The device also demonstrated broadband detection capabilities from 405 nm to 1550 nm and excellent imaging performance in the near-infrared region at 0 V bias.In summary,the outstanding photoelectric detection performance and imaging capabilities of the PbSe/WSe_(2)heterojunction nanosheet detector indicate its significant potential for applications in miniaturized,low-noise,broadband,high-speed and high-performance photodetectors.
文摘文中展示了一种基于IGZO/NiO/PbSe纳米带阵列异质结结构的双极结型红外光电晶体管作为先进的快速光敏核心,能够满足近红外药液检测的需求。其中,PbSe纳米带阵列可以增强探测器对于红外波段的光吸收,加强光生载流子的收集。实验表明该晶体管具有高动态探测率(1.14×10^(12)Jones)和高响应度(4100 A/W)的优点,能够完美兼容自主设计的高精度差分负反馈锁相放大电路,通过观察到检测出的二次谐波(Twice the Fundamental Frequency,2f)信号的振幅与溶质之间存在良好的线性关系,继而能够准确推断出药液中溶质的种类和浓度信息。
文摘PbSe nanoparticles with dendrites have been prepared by sonoelectrochemical method from an aqueous solution containing Pb(Ac)2 and Na2SeSO3 in the presence of Trisodium Citrate (TSC). The nanoparticles were characterized by using powder X ray diffraction (XRD), transmission electron microscope (TEM) and X ray photoelectron spectroscopy(XPS). XRD patterns show the presence of diffraction peaks corresponding to the (111), (200),(220), (311), (222) planes of cubic PbSe. The TEM image shows dendrits PbSe in the presence of TSC, while in the presence of Potassium Nitrilotriacetate(NTA) the TEM image shows monodisperse spherical nanoparticles with an average size of 20nm. The effects of electrolysis and complexing agents on particle size and shape were also discussed.
