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（PeLED）具有成为下一代照明技术的巨大潜力，但近年来其发展速度急剧放缓并达到瓶颈，这要求深入了解器件的物理特性及其与器件性能的相关性，以指导PeLED的下一次发展。然而，由于缺乏合适的技术和方法用于器件物理研究，使得PeLED的基本工作机制在现阶段仍然不清楚，特别是对于那些基于准2D钙钛矿的PeLED，由于具有各种尺寸和带隙的多个纳米结构的共存，这些准2D钙钛矿遭受复杂的光电过程。为了解决这个问题，我和我的导师（来自伦敦帝国理工学院的阿尔特姆博士和安德烈亚斯·卡菲扎斯博士）将通过建立新的瞬态光谱工具包（例如，电泵浦-光推-光探针和电泵浦-光推-光电流测量）。这些技术使我们能够访问的电荷注入，转移，重组，和捕获/脱陷过程中的工作PeLED在operando与时间尺度从fs到ms，因此提供更大的洞察力器件的电子物理。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/空穴传输层的能级和厚度来调制，我们将研究这两个过程如何影响器件中的电荷复合和捕获/去捕获过程。此外，我们将关联电荷载流子动力学和耦合过程（例如，光子-声子和电子-声子耦合）与器件特性的关系，从微观到宏观更全面地了解准二维PeLED，从而为钙钛矿LED领域的进一步发展提供材料和器件设计的合理指导。

项目成果

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

通过红外光学激活光谱观察到的钙钛矿太阳能电池中的载流子的操作动力学。

• 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.