Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Hysteretic Ion Migration and Remanent Field in Metal Halide Perovskites
Advanced Science ( IF 14.3 ) Pub Date : 2020-08-19 , DOI: 10.1002/advs.202001176 Yongtao Liu 1, 2 , Nikolay Borodinov 1 , Matthias Lorenz 1 , Mahshid Ahmadi 2 , Sergei V Kalinin 1 , Anton V Ievlev 1 , Olga S Ovchinnikova 1
Advanced Science ( IF 14.3 ) Pub Date : 2020-08-19 , DOI: 10.1002/advs.202001176 Yongtao Liu 1, 2 , Nikolay Borodinov 1 , Matthias Lorenz 1 , Mahshid Ahmadi 2 , Sergei V Kalinin 1 , Anton V Ievlev 1 , Olga S Ovchinnikova 1
Affiliation
|
The gap in understanding how underlying chemical dynamics impact the functionality of metal halide perovskites (MHPs) leads to the controversy about the origin of many phenomena associated with ion migration in MHPs. In particular, the debate regarding the impact of ion migration on current–voltage (I–V) hysteresis of MHPs devices has lasted for many years, where the difficulty lies in directly uncovering the chemical dynamics, as well as identifying and separating the impact of specific ions. In this work, using a newly developed time‐resolved time‐of‐flight secondary ion mass spectrometry CH3NH3+ and I− migrations in CH3NH3PbI3 are directly observed, revealing hysteretic CH3NH3+ and I− migrations. Additionally, hysteretic CH3NH3+ migration is illumination‐dependent. Correlating these results with the I–V characterization, this work uncovers that CH3NH3+ redistribution can induce a remanent field leading to a spontaneous current in the device. It unveils that the CH3NH3+ migration is responsible for the illumination‐associated I–V hysteresis in MHPs. Hysteretic ion migration has not been uncovered and the contribution of any ions (e.g., CH3NH3+) has not been specified before. Such insightful and detailed information has up to now been missing, which is critical to improving MHPs photovoltaic performance and developing MHPs‐based memristors and synaptic devices.
中文翻译：
金属卤化物钙钛矿中的迟滞离子迁移和剩余场
由于对基础化学动力学如何影响金属卤化物钙钛矿 (MHP) 功能的理解存在差距，导致了关于与 MHP 中离子迁移相关的许多现象的起源的争议。特别是，关于离子迁移对MHP器件电流-电压（I - V）滞后影响的争论已经持续了很多年，其中的困难在于直接揭示化学动力学，以及识别和分离离子迁移的影响。特定离子。在这项工作中，使用新开发的时间分辨飞行时间二次离子质谱法直接观察CH 3 NH 3 +和I -在CH 3 NH 3 PbI 3中的迁移，揭示了滞后的CH 3 NH 3 +和I -迁徙。此外，迟滞CH 3 NH 3 +迁移与光照有关。将这些结果与I – V特性相关联，这项工作发现 CH 3 NH 3 +重新分布可以感应剩余场，从而在器件中产生自发电流。它揭示了 CH 3 NH 3 +迁移是MHP 中与照明相关的I – V滞后的原因。迟滞离子迁移尚未被揭示，并且任何离子（例如CH 3 NH 3 +）的贡献之前尚未被指定。迄今为止，此类富有洞察力和详细的信息一直缺失，这对于提高 MHP 光伏性能和开发基于 MHP 的忆阻器和突触器件至关重要。
更新日期：2020-10-07
中文翻译：
金属卤化物钙钛矿中的迟滞离子迁移和剩余场
由于对基础化学动力学如何影响金属卤化物钙钛矿 (MHP) 功能的理解存在差距，导致了关于与 MHP 中离子迁移相关的许多现象的起源的争议。特别是，关于离子迁移对MHP器件电流-电压（I - V）滞后影响的争论已经持续了很多年，其中的困难在于直接揭示化学动力学，以及识别和分离离子迁移的影响。特定离子。在这项工作中，使用新开发的时间分辨飞行时间二次离子质谱法直接观察CH 3 NH 3 +和I -在CH 3 NH 3 PbI 3中的迁移，揭示了滞后的CH 3 NH 3 +和I -迁徙。此外，迟滞CH 3 NH 3 +迁移与光照有关。将这些结果与I – V特性相关联，这项工作发现 CH 3 NH 3 +重新分布可以感应剩余场，从而在器件中产生自发电流。它揭示了 CH 3 NH 3 +迁移是MHP 中与照明相关的I – V滞后的原因。迟滞离子迁移尚未被揭示，并且任何离子（例如CH 3 NH 3 +）的贡献之前尚未被指定。迄今为止，此类富有洞察力和详细的信息一直缺失，这对于提高 MHP 光伏性能和开发基于 MHP 的忆阻器和突触器件至关重要。
京公网安备 11010802027423号