Correlation Between Charge Carrier Dynamics and Device Properties in Working Quasi-Two-Dimensional Perovskite Light-Emitting Diodes

准二维钙钛矿发光二极管中电荷载流子动力学与器件特性之间的相关性

• 批准号: EP/X027465/1
• 负责人: Artem Bakulin
• 金额: $ 26万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FX027465%2F1
• 关键词: Correlation; Between; Charge; Carrier; Dynamics

The development of perovskites light-emitting diodes (PeLEDs) that have great potential to be the next-generation lighting technique dramatically slows down and reaches a bottleneck in recent years, which calls for an in-depth understanding of the device photophysics and its correlation to device properties to guide the next evolution of PeLEDs. However, the lack of suitable technique and methodology for device photophysics investigation makes the fundamental working mechanism of PeLEDs remains unclear at this stage, especially for those based on quasi-2D perovskites that suffer from complicated optoelectronic processes due to the co-existence of multiple nanostructures with various dimensions and bandgaps. To address this issue, my host supervisors (Dr Artem Bakulin and Dr Andreas Kafizas from Imperial College London) and I will investigate the charge carrier dynamics in working quasi-2D PeLEDs via establishing novel transient spectroscopic toolkits (e.g., electrical pump-optical push-optical probe and electrical pump-optical push-photocurrent measurements). These techniques allow us to access the charge injection, transfer, recombination, and trapping/detrapping processes in working PeLEDs in operando with a time scale from fs to ms, and hence provide greater insight for device photophysics. More specifically, the charge injection and transfer processes will be modulated by controlling the energy level and thickness of the metal oxide electron/hole transport layer and we will study how these two processes affect charge recombination and trapping/detrapping processes in devices. Moreover, we will correlate the charge carrier dynamics and coupling processes (e.g., photon-phonon and electron-phonon coupling) with device properties to provide a more comprehensive understanding of quasi-2D PeLEDs from the microscopic to the macroscopic world, and hence offer rational guidance on the material and device designs for the further development of perovskite LED field.

钙钛矿发光二极管（PELEDS）的发展具有巨大的潜力，这些二极管有可能成为下一代照明技术，近年来会大大减慢并达到瓶颈，该技术要求对设备光体物理学及其对设备的相关性进行深入了解，以指导peleds的下一步进化。然而，缺乏适当的技术和方法来进行设备光体物理学研究，因此在此阶段，骨膜的基本工作机制尚不清楚，尤其是对于基于准四纳米结构与各种尺寸和频段盖的复杂的光电过程的准2D perovskites的基本工作机制。为了解决这个问题，我的主管（来自伦敦帝国帝国学院的Artem Bakulin博士和Andreas Kafizas博士），我将通过建立新型的瞬态光谱工具包（例如，电气泵浦的推动电动探头和电气泵送泵送的量子测量）来调查工作Quasi-2D骨的动力学。这些技术使我们能够以从FS到MS的时间尺度访问Operando中工作骨骼中的电荷注入，转移，重组和捕获/den缩过程，因此为设备光体物理学提供了更大的见解。更具体地说，电荷注入和转移过程将通过控制金属氧化物电子/孔传输层的能级和厚度来调节，我们将研究这两个过程如何影响设备中的电荷重组和捕获/脱落过程。此外，我们将将电荷载体动力学和耦合过程（例如光子播和电子偶联）与设备属性相关联，以提供对从微观镜头到巨大世界的准2D毛刺的更全面的理解，从而为材料和设备设计提供了合理的领域，以便为材料和设备设计提供了合理的指导。

项目成果

Operando dynamics of trapped carriers in perovskite solar cells observed via infrared optical activation spectroscopy.

• DOI: 10.1038/s41467-023-43852-5
• 发表时间: 2023-12-04
• 期刊: NATURE COMMUNICATIONS
• 影响因子: 16.6
• 作者: Pan, Jiaxin;Chen, Ziming;Zhang, Tiankai;Hu, Beier;Ning, Haoqing;Meng, Zhu;Su, Ziyu;Nodari, Davide;Xu, Weidong;Min, Ganghong;Chen, Mengyun;Liu, Xianjie;Gasparini, Nicola;Haque, Saif A.;Barnes, Piers R. F.;Gao, Feng;Bakulin, Artem A.
• 通讯作者: Bakulin, Artem A.