新型半透明一维MAPbI_(3)·DMF单晶材料的光电响应特性  

Photoelectric response characteristics of a novel translucent one-dimensional MAPbI;·DMF single crystal material

作　　者：秦昌东 卢岳[1] 隋曼龄[1] Changdong Qin;Yue Lu;Manling Sui(Beijing Key Laboratory of Microstructure and Property of Solids,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料与制造学部,固体微观结构与性能北京重点实验室,北京100124

出　　处：《科学通报》2021年第34期4458-4465,共8页Chinese Science Bulletin

基　　金：国家重点研究发展计划(2016YFB0700700);国家自然科学基金(11704015,51621003,12074016);北京市教师队伍建设创新团队项目(IDHT20190503);北京市教委科研项目(KM202110005003);北京市科技创新服务能力建设-高精尖学科建设-材料科学与工程学科项目(PXM2019_014204_500031)资助。

摘　　要：由于有机金属卤化物钙钛矿往往具有优异的光电性质,因此其在光电探测器研发领域拥有广阔的应用前景和使用价值.本文旨在开发制备适用于半透明光电器件的高性能材料,并探索材料的潜在性质.通过反溶剂法,成功设计并制备出了一种尺寸可控且在大气环境下稳定的半透明线状MAPbI_(3)·DMF单晶材料.利用单晶X射线衍射(XRD)解析了半透明线的晶体结构,发现其具有一维链状晶体结构,因而具有一定的量子限域效应.原位加热XRD谱和原位加热透射电子显微镜(TEM)分析结果表明,该半透明晶体材料在90℃以下形貌及晶体结构基本保持不变,其热稳定性较好.紫外可见吸收光谱及静态光致发光光谱(PL)测试结果表明,该材料带隙约为1.58 eV,与其可发射约780 nm的荧光相一致.该单晶线的透明度在大于500 nm的范围内增大,表明其具有良好的半透明特性.最后,搭建了简单的光电器件,测试结果表明其具有较高的光电响应度(7.13 A W^(-1))和较快的光电响应时间(9.95 ms),因此适合应用于光电探测器件领域.该线状单晶材料优异的光电特性,使其成为半透明光电器件核心吸光层的理想候选者.Organic halide perovskites have broad application prospects in photoelectric detector due to their excellent photoelectric properties. Moreover, there has been growing interest in applying halide perovskites to semitransparent photovoltaics to achieve the highest combination of transparency and efficiency. In this paper, we aimed to prepare high-performance materials which are suitable for translucent optoelectronic devices using new preparation methods and explore the potential properties of these materials.We successfully synthesize a type of translucent linear MAPbI3·DMF single crystal material with controllable size and good stability in atmospheric environment using the anti-solvent method. Toluene, which is often used as one of the surfactants to control the morphology of the perovskite films, was used as an anti-solvent in this paper. The growth of the one-dimensional(1D) single crystal wires was regulated by the control of the adsorbed toluene molecular at the interface,promoting the [PbI_(6)]^(4-)octahedral unit in the precursor to assemble into a chain structure along the 1D direction. In addition,we could control the width and length of the single crystal wires via a slow cooling process. The width can reach tens of microns, and the length of the single crystal wires can be the centimeter level.The crystal structure of the transparent wire was analyzed using single crystal X-ray diffraction(XRD). The material exhibited a good 1D chain structure with an infinitely extended single edge-sharing octahedral lead halide chain {PbI_(3)}^(-)surrounded by CH_(3)NH_(3)^(+)(MA) and N,N-dimethylformamide(DMF). Through XRD characterization of the crystal structure after keeping the material at room temperature in air(~25℃, humidity ~40%) for a long time, we found that the single-crystal wire showed good stability in air. In addition, in situ heating XRD and in situ heating transmission electron microscopy(TEM) analyses showed that the morphology and crystal structure of the semi-transparent perovskite remained s

关 键 词：半透明 一维单晶材料 光电探测器 透射电子显微镜 

分 类 号：TN15[电子电信—物理电子学] TB34[一般工业技术—材料科学与工程]