2024年2月21日，太阳集团www0638周海特聘教授课题组联合武汉大学方国家教授课题组在Nature Communications（《自然•通讯》）上在线发表了关于纯碘全无机锡铅钙钛矿量子点的最新研究成果。

论文题为“Spontaneous crystallization of strongly confined CsSn_xPb_1-xI₃ perovskite colloidal quantum dots at room temperature”（《纯碘全无机CsSn_xPb_1-xI₃钙钛矿量子点在室温下的强限域自发结晶》）。0638太阳集团章楼文博士后为第一作者，周海特聘教授和方国家教授为共同通讯作者，太阳集团www0638为论文第一单位。

近年来，全无机卤化物钙钛矿量子点因其优异的光物理特性以及低成本的溶液法制备，在光电器件领域得到了广泛的应用。然而，由于热非平衡导致的相转变（亚稳态光活性钙钛矿相转变为稳定的非钙钛矿黄相），纯碘全无机钙钛矿量子点的室温合成仍然极具挑战性。另外，室温下该类卤化物晶体在非极性溶剂中的结晶速率非常快，极易形成较大尺寸的非钙钛矿相晶体。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的实现纯碘全无机锡铅混合钙钛矿（CsSn_xPb_1-xI₃）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，CsSn_0.09Pb_0.91I₃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。

该工作开创了纯碘全无机锡-铅混合钙钛矿量子点在室温环境中的可控合成，丰富了该类钙钛矿量子点的合成途径，填补了相关研究的空白。

该研究得到国家自然科学基金、湖北省重点研发计划项目以及2022年广东高校科研平台等项目的支持。

论文链接：https://www.nature.com/articles/s41467-024-45945-1

（撰稿：章楼文；一审：周海；二审：刘文博；三审：任斌）

Professor Hai Zhou’s Research Team Publishes New Findings on Perovskite Quantum Dots in Nature Communications

Date: March 14, 2024
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On February 21, 2024, the research team led by Professor Hai Zhou from the International School of Microelectronics, Dongguan University of Technology, in collaboration with Professor Guojia Fang’s team from Wuhan University, published their latest research findings on all-inorganic tin-lead perovskite quantum dots in Nature Communications.

The paper, titled "Spontaneous crystallization of strongly confined CsSnxPb1-xI3 perovskite colloidal quantum dots at room temperature", features Dr. Louwen Zhang, a postdoctoral researcher at the International School of Microelectronics, Dongguan University of Technology, as the first author, while Professor Hai Zhou and Professor Guojia Fang serve as co-corresponding authors. Dongguan University of Technology is listed as the first-affiliated institution.

In recent years, all-inorganic halide perovskite quantum dots have gained widespread applications in optoelectronic devices due to their exceptional photophysical properties and the cost-effective solution-based synthesis. However, the room-temperature synthesis of all-inorganic iodide perovskite quantum dots remains highly challenging due to phase transformation caused by thermodynamic nonequilibrium, where metastable photoactive perovskite phases transition into stable, non-perovskite yellow phases. Additionally, at room temperature, these halide crystals exhibit rapid crystallization rates in nonpolar solvents, making it extremely easy for large-sized non-perovskite phase crystals to form.

This study introduces a novel room-temperature reaction system that enables the spontaneous crystallization of strongly confined all-inorganic tin-lead mixed perovskite (CsSnxPb1-xI3) quantum dots in a cesium-deficient reaction environment. The resulting colloidal solution exhibits bright yellow light emission. By adjusting the amount of cesium precursor, the morphology, size, and optical bandgap of the product can be further controlled. Compared to intrinsic CsPbI3 quantum dots synthesized under the same conditions, CsSn0.09Pb0.91I3 perovskite quantum dots demonstrate superior yellow light emission, prolonged carrier lifetimes, and enhanced structural stability. These advantages stem mainly from strong quantum confinement effects, the passivation effect of Sn(II) ions, and an increased defect formation energy.

Furthermore, this room-temperature strong-confinement synthesis technique is also applicable to the fabrication of wide-bandgap bromide- and chloride-based all-inorganic perovskite quantum dots, as well as iodide-based organic-inorganic hybrid perovskite quantum dots, showcasing excellent versatility.

This research pioneers the controllable room-temperature synthesis of all-inorganic tin-lead mixed perovskite quantum dots, enriching synthesis strategies for this class of materials and addressing a crucial gap in the field.

The study was supported by the National Natural Science Foundation of China, the Hubei Provincial Key Research and Development Program, and the 2022 Guangdong Higher Education Research Platform Project.

Paper link

(Drafted by: Louwen Zhang; First review: Hai Zhou; Second review: Wenbo Liu; Third review: Bin Ren)