2024年4月18日下午在大学创新城G2栋2楼203会议室，周海教授为学院老师、研究生，分享了最新的研究成果——钙钛矿量子的室温合成及应用。

周海教授介绍到，钙钛矿量子点结合了“钙钛矿”与“量子点”二者的优势，具有“发光效率高、谱段范围广、能量量子化、超纯性”等特点，并广泛应用于“太阳能电池、电视显示、墨水、存储器”等领域。

据悉，该项研究通过采用一个全新的室温反应体系，在贫Cs的反应环境中简便快速地实现纯碘全无机锡铅混合钙钛矿量子点的强限域自发结晶，其胶体溶液表现出明亮的黄光发射。通过改变Cs前驱体的用量，可以进一步调控产物的形貌尺寸和光学带隙。与相同工艺制备的本征CsPbI3量子点相比，Sn掺杂的钙钛矿量子点显示出优异的黄光发射性能、延长的载流子寿命以及增强的结构稳定性。这主要得益于量子点强的量子尺寸效应、亚锡离子的钝化效应以及提高的缺陷形成能。此外，该室温强限域合成技术同样适用于宽带隙溴基和氯基全无机钙钛矿量子点以及碘基有机-无机杂化钙钛矿量子点的制备，具有很好的普适性。

课题组及负责人简介：周海博士，现为0638太阳集团特聘教授、学科方向领军人才。2012年获得武汉大学博士。主要从事半导体薄膜材料、微纳光电子器件及其物理机制方面的研究工作，已经取得和发表了一系列成果。在氧化物半导体、卤化物钙钛矿等材料器件的制备及性能优化等方面，申请人以第一或者通信作者身份在包括Nat. Commun.、InfoMat、Nano Energy、ACS Nano和Nano-Micro Letters等学术期刊上发表SCI论文60多篇，SCI他引超过2900次；授权国家发明专利7项，获湖北省科学技术二等奖1项；入选2023年全球前2%顶尖科学家。

（撰稿、一审：刘文博；二审：逯瑶；三审：任斌 ）

Professor Hai Zhou from the International School of Microelectronics, Dongguan University of Technology, Shares the Latest Research Findings on Room-Temperature Synthesis and Applications of Perovskite Quantum Dots

Date: April 19, 2024
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On the afternoon of April 18, 2024, in Room 203, 2nd Floor, Building G2 at University Innovation City, Professor Hai Zhou delivered a lecture to faculty members and graduate students of the International School of Microelectronics, Dongguan University of Technology, sharing his latest research findings on the room-temperature synthesis and applications of perovskite quantum dots.

Professor Hai Zhou introduced that perovskite quantum dots combine the advantages of both "perovskite" and "quantum dots," possessing characteristics such as "high luminous efficiency, wide spectral range, quantum energy level confinement, and ultra-purity." These materials have been widely applied in various fields, including "solar cells, television displays, inks, and memory devices."

This research achieves the strong confined spontaneous crystallization of pure iodine-based all-inorganic tin-lead mixed perovskite quantum dots through a novel room-temperature reaction system under a cesium-deficient environment. The resulting colloidal solution exhibits bright yellow light emission. By adjusting the amount of Cs precursor, the morphology, size, and optical bandgap of the product can be further tuned. Compared with intrinsic CsPbI₃ quantum dots prepared using the same process, Sn-doped perovskite quantum dots demonstrate superior yellow light emission performance, prolonged carrier lifetime, and enhanced structural stability. These improvements are attributed to the strong quantum size effect of the quantum dots, the passivation effect of Sn²⁺ ions, and the increased defect formation energy. Moreover, this room-temperature strong confinement synthesis technique is also applicable to the fabrication of wide-bandgap bromine-based and chlorine-based all-inorganic perovskite quantum dots, as well as iodine-based organic-inorganic hybrid perovskite quantum dots, showcasing excellent universality.

Research Team and Principal Investigator

Dr. Hai Zhou is currently a distinguished professor at the International School of Microelectronics, Dongguan University of Technology, and a leading academic talent in his field. He obtained his Ph.D. from Wuhan University in 2012. His research primarily focuses on semiconductor thin-film materials, micro/nano optoelectronic devices, and their physical mechanisms. Over the years, he has made significant contributions and published numerous research findings. In the fields of oxide semiconductors and halide perovskite materials and devices, he has authored or co-authored over 60 SCI papers in prestigious journals such as Nature Communications, InfoMat, Nano Energy, ACS Nano, and Nano-Micro Letters, with more than 2,900 SCI citations. He holds seven granted national invention patents and has received the Second Prize of Hubei Provincial Science and Technology Award. In 2023, he was recognized as one of the world’s top 2% scientists.

(Written and first review: Wenbo Liu; Second review: Yao Lu; Final review: Bin Ren)