在SnO2/FAPbI3接口上解开BF4基离子液的动态行为,使用ab initio的分子动力学模拟
Jinge Han1, Hongbin Xiao1,2, Yanru Guo1
1Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. xiaohongbin@cqu.edu.cn.
Physical chemistry chemical physics : PCCP
|August 1, 2023
概括
在氧化/FAPbI3接口上含有四甲酸离子的离子液体消除氧气空缺,增加离子迁移障碍. 这项研究探讨了改进的矿太阳能电池的动态行为.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学计算化学
- 固态物理 固态物理
背景情况:
- 矿太阳能电池 (PSC) 是一个有前途的可再生能源设备.
- 接口工程对于PSC的效率和稳定性至关重要.
- 已知问题是SnO2中的氧空位和FAPbI3中的离子迁移.
研究的目的:
- 在SnO2/FAPbI3接口上研究基于BF4的离子液体 (IL) 的动态行为.
- 了解BMIM+BF4-IL在修改接口的电子和离子特性中的作用.
- 阐明ILs影响缺陷状态和离子运输的机制.
主要方法:
- 首先使用了分子动力学 (AIMD) 模拟.
- 模拟的重点是SnO2 / FAPbI3接口与BMIM + BF4- IL.
- 分析包括状态的电子密度和离子迁移能量障碍.
主要成果:
- BMIM+BF4-离子液有效地消除了由SnO2.2.中的氧空缺引起的密度状态.
- 存在IL显著增加了FAPbI3.3内离子迁移的能量屏障.
- 这些效应表明IL在接口上的被动作用.
结论:
- 基于BF4的离子液体,特别是BMIM+BF4-,可以使SnO2/FAPbI3接口上的缺陷被动化.
- 液晶电池能够减少氧气空缺并阻碍离子迁移,这为提高PSC稳定性和性能提供了一条途径.
- 对于下一代太阳能电池,对基于IL的接口工程进行进一步的研究是有必要的.
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