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有效的光电化学生成使用环保的"巨人"InP/ZnSe核心/外量子点

Jiabin Liu¹, Shuai Yue², Hui Zhang¹

¹Centre Énergie Matériaux et Télécommunications, Institut National de la Recherche Scientifique, 1650 Boul. Lionel Boulet, Varennes, Quebec J3X 1P7, Canada.

ACS applied materials & interfaces

|July 11, 2023

概括

环保的化 (InP) 量子点 (QD) 对太阳能电池来说是有前途的. 将InP QD包装在化 (ZnSe) 外中,可以显著提高其气生成效率和稳定性.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
摄影化学的使用.

背景情况:

化物 (InP) 量子点 (QD) 为太阳能技术提供了优势,因为其低毒性和高效的光吸收.
在InP QD中,高表面陷密度限制了它们的能量转换效率和长期稳定性.
用更宽的带隙外封装InP QD是减轻表面陷和增强光电子属性的关键策略.

研究的目的:

为了合成"巨大的"InP/ZnSe核心/外量子点,可调节外厚度.
为了研究ZnSe外厚度对光电子特性和生成的光电化学 (PEC) 性能的影响.
了解载体动力学和表面被动化效应,以优化基于InP的QD设备.

主要方法:

"巨型"InP/ZnSe核心/外量子点的合成,具有不同的ZnSe外厚度 (0.9-2.8 nm).
光学表征分析电子和孔移位和载体转移动态.
光电化学 (PEC) 测量以评估气发电性能.

主要成果:

ZnSe外的生长促进了电子和孔的移位到外中,增强了被动化和载体提取.
一个1.6纳米的最佳ZnSe外厚度产生了6.2mA cm-1的光电流密度,比赤裸的InP QDs有288%的改进.
调整ZnSe外厚度对于优化载体转移动态和光电子特性至关重要.

结论:

在InP/ZnSe核心/外QD中设计ZnSe外厚度对于提高PEC性能至关重要.
这些环保的"巨型"核心/外QD显示了高效太阳能气发电的巨大潜力.
该研究为设计基于InP的高性能核心/外QD用于能源应用提供了基本的见解.

关键词:

在InP/ZnSe量子点中.电荷转移动态的动态.没有重金属的自由.通过光电化学的气产生.贝的厚度贝的厚度

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