稀土掺杂的CdE（E=S或Se）三元化合物半导体纳米带及其有机钙钛矿杂化材料多波段光探测和红外探测研究

Semiconductor CdE (E=S or Se) doped with rare earth (denoted as CdSRE) and their alloyed ternary nanoribbons (nanocables) and nanoribbon lateral heterostructures were studied by FE-SEM, HRTEM and four nanoprobes, picosecond spectrometer, near-field optical microscope-NSOM & nano-optoelectronics analysis platform. The effects of the microstructure and composition of CdSRE nanomaterials and their hybrid organic perovskite materials on electronic, photoconductance and multi-frequency infrared detective properties were be decided. Infrared detective size effects of nanoribbons with different thickness or nanocable with different diameter were be explored. Thus, we will understand the relationship of between the microstructure, composition, spectra of CdSRE nanoribbons（nanocables and nanoribbon lateral heterostructures） and their infrared detective properties. The infrared detective mechanism of CdSRE nanomaterials and their hybrid structures were be explained by combination of theoretic results and the effects of doping、strain、absorbed layer of organic perovskite materials、and the surface plasmon resonances in the metallic gold nanoparticles on photoelectronic detectors. It is possible to obtain multiple-frequency & uncooled infrared detectors high response, photodetectivity & high external quantum efficiency, which can compare with three-frequency light detector of InGaAs designed through our project. Moreover, this project will provide valuable study results on preparation of new multiple-frequency & uncooled infrared detective materials and devices.

用场发射扫描电镜，高分辨透射电镜，四探针Nanoprobe系统，皮秒光谱仪等研究单片一维稀土掺杂CdE(E=S或Se)三元化合物纳米带(电缆)、侧向异质结纳米带及其与有机金属卤化物钙钛矿杂化材料的结构、成分、电学性质、变温光导和光电探测性质。确定纳米带微结构、成分、有机金属卤化物钙钛矿材料及金纳米粒子对光导、多波段光探测和红外探测性质的影响及不同厚度的纳米结构光电探测的尺寸效应。揭示材料结构、成分、光谱等与光电探测性质的关系。结合理论研究阐明稀土掺杂、应力、有机金属卤化物钙钛矿吸收层及金纳米粒子的表面等离子体增强效应等对多波段光探测、红外探测作用的物理机制。从而研制高响应、高探测率、高外量子转化效率的纳米多波段光电探测器和红外探测器。本项目的研究有可能促成可与InGaAs三波段探测器相比拟的多波段非制冷红外探测纳米器件的面世，并为研制多波段非制冷红外探测材料提供有价值的研究结果。

以申请书为项目实施依据，根据实验新发现和理论新结果作研究重点调整，具体内容如下：.（1）研究了稀土Er3+掺杂的CdSe纳米带及4根并排CdSe纳米带光导性质，在此基础上，利用金纳米粒子的表面局域等离子体共振增强效应，设计制作了金纳米粒子杂化单根CdSe纳米带光电器件，探究了光电探测规律。.研究表明：4根并排的CdSe纳米带的响应度（Rλ）和外量子效率（EQE）比单根CdSe纳米带高出两个数量级；其比探测率（D*）是单根CdSe纳米带的2倍。单根Er掺杂的CdSe纳米带器件的Rλ、EQE、D*是4根并排的CdSe纳米带器件对应参数大10倍以上。金纳米粒子杂化单根CdSe纳米带器件，最强响应波长是550 nm，其Rλ是CdSe纳米带的22.49倍，EQE提高了19.76倍，D*提高了5.25倍，用DDA理论仿真解释光导机理。.（2）通过有机-无机杂化异质结设计，制作碘化铅纳米片/硒化镉纳米带（PbI2 NS/CdSe NB）及CH3NH3PbI3微（纳）米线阵列和CdSe纳米带杂化结构(CH3NH3PbI3 NAs/CdSe NB)叠层杂化探测器，它们分别在490和700 nm 附近及480和780 nm具有两个波段极强光响应，且光电探测器重要指标参数得到极大的提高，并用光辐照前后能带变化解释了结果，成果在Chem. Eng. J.、Adv. Opt. Mater.上发表，为多波段红外探测器的研发提供了新方法、新途径。.（3）研究了CdS与CdS/Au花状纳米结构材料以及CdS纳米树状材料/MoS2二维层状纳米薄片复合异质结的表面拉曼增强特性及气敏性质，前者对结晶紫、罗丹明B、孔雀绿的监测具有重要应用，后者对醇类具有良好的选择性，可应用于酒驾监测..（4）用密度泛函理论系统研究了CH3NH3PbI3/CNT复合结构的电子结构及光吸收，为复合结构的光电探测器设计及性能提高提供理论指导。