表面被动化抑制了化烯矿中局部离子运动
Justin Pothoof1, Robert J E Westbrook1, Rajiv Giridharagopal1
1Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States.
The journal of physical chemistry letters
|June 26, 2023
概括
使用APTMS的表面被动化显著降低了基于formamidinium的矿半导体中的离子迁移,提高了它们的稳定性. 这种化学处理降低了接触电位差异转移,表明矿太阳能电池的性能有所改善.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 太阳能光伏发电是如何实现的
背景情况:
- 含有formamidinium (FA) 的化物矿是太阳能电池的有希望的半导体材料.
- 矿中的离子迁移可能会降低设备的性能和稳定性.
- 了解和减轻离子迁移对于推进矿技术至关重要.
研究的目的:
- 为了研究化学表面被动化对Cs$_{0.22}$FA$_{0.78}$Pb(I$_{0.85}$Br$_{0.15}$) $_3$矿膜中的离子迁移的影响.
- 量化 (3-aminopropyl) trimethoxysilane (APTMS) 对离子迁移动态的影响.
- 为了将表面被动化与减少的光诱导化物迁移相关联.
主要方法:
- 扫描凯尔文探针显微镜 (SKPM) 用于测量电压抛光后接触电位差异 (CPD) 的变化.
- 超光谱显微镜用于评估光诱导的化物迁移.
- 在原始和APTMS处理的矿膜中分析离子迁移.
主要成果:
- 控制膜中的离子迁移在短时间的电压抛光后导致了显著的CPD转移 (∼100mV).
- 观察到离子迁移是异质的,在域界面上有更大的转移.
- 通过APTMS被动化,CPD转移减少了五倍 (至≤20mV),光诱导的化物迁移减少了.
结论:
- APTMS表面被动化有效地抑制了含有FA的矿膜中的离子迁移.
- 被动化机制归因于化物空置度的减少.
- 这些发现表明,APTMS是提高矿半导体运行稳定的有希望的策略.
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