高电子和低离子运输之间的平衡作用受到矿颗粒边界的影响
Nadja Glück1,2, Nathan S Hill3, Marcin Giza4
1Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU) Butenandtstr. 5-13 81377 München Germany.
Journal of materials chemistry. A
|May 16, 2024
概括
优化混合矿光伏需要了解谷物边界. 较大的颗粒大小可以提高电荷的移动性,但特定的晶体定向 ((200) 面) 可能会由于离子迁移而导致性能问题.
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:
- 混合矿太阳能电池有望实现高效率.
- 了解粒度边界效应对于设备优化至关重要.
- 晶体大小和方向显著影响光伏性能.
研究的目的:
- 研究矿晶体大小和方向对物理性质和光伏性能的影响.
- 使用一种新的合成方法,将晶体定向与颗粒大小脱.
- 阐明混合矿器件性能变化背后的机制.
主要方法:
- 开发了一种新的合成方法来控制晶体方向 ((200) 或 (002) 面) 独立于颗粒大小.
- 操纵的二甲基硫氧化物 (DMSO) 和四二烯-1-氧化物 (THTO) 的比例.
- 研究了电荷载体的移动性,并分析了电流密度-电压 (J-V) 曲线.
- 采用漂移扩散模拟来模拟离子运输.
主要成果:
- 电荷载体的移动性随着颗粒大小的增加而增加,这表明晶体乱减少.
- 具有 (200) 面面向的设备表现出J-V曲线的s形状,暗示了界面障碍.
- 漂移扩散模拟将s形形归因于缓慢的离子流动性 (0.37 × 10−10 cm2 V−1 s−1) 和低的移动离子密度.
- 减少的离子迁移并没有本质上将hysteresis最小化.
结论:
- 通过增加粒径来最大限度地减少晶体乱是高效的混合矿光伏设备的关键.
- 面向 (200) 面向提出了与离子动力学和歇斯底里斯有关的挑战.
- 优化矿器件需要一个细微的方法,考虑颗粒大小和特定的面向,以管理离子迁移和界面效应.
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