在混合化矿膜中进行化离子分离
Journal of the American Chemical Society
|February 22, 2020
概括
矿太阳能电池中的电子传输层可能会由于电子捕获和洞积累导致化离子分离. 抑制孔积累可以防止这种不稳定性,提高设备的性能.
科学领域:
- 材料科学
- 太阳能发电
- 固态化学
背景情况:
- 电子传输层 (ETL) 对矿太阳能电池的性能至关重要.
- 矿膜与ETL之间的相互作用会影响离子迁移和稳定性.
- 混合化 (MHP) 具有独特的光电子特性,但可能遭受相分离.
研究的目的:
- 研究电子输送层在MHP中的离子分离中的作用.
- 在激光激发下阐明TiO2辅助化离子分离的机制.
- 探索抑制化物分离和增强MHP稳定的策略.
主要方法:
- 在不同基板 (TiO2和ZrO2) 上制造MHP薄膜.
- 用脉冲激光激发 (387 nm,500 Hz) 来诱导和研究分离.
- 使用光谱技术进行离子迁移和分离的表征.
- 带有孔输送层和没有孔输送层的装置测试 (spiro-OMeTAD).
主要成果:
- 与绝缘ZrO2不同的是,TiO2ETL在激光激发下促进化离子分离.
- 电子注入TiO2和随后的O2吸收导致MHP中的洞积累.
- 在位上的孔位引发了不稳定性和向谷物边界的迁移.
- 通过提取孔,沉积一个孔输送层 (spiro-OMeTAD) 有效地抑制分离.
结论:
- 孔积累是MHP中化物分离的一个关键驱动因素.
- 通过电荷载体动力学,ETL在MHP的不稳定性中发挥着间接但重要的作用.
- 控制孔的移动性和积累对于稳定矿太阳能电池至关重要.
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