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基于核心尺寸效应的高效光电化学生成异构结构量子点的核心尺寸效应

Kanghong Wang^1,2,3, Yi Tao¹, Zikun Tang¹

¹Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|November 30, 2023

概括

体量子点 (QD) 增强光电化学 (PEC) 生成. 在QD中优化CdSe/CdS核心大小可以提高PEC性能,3.5nm核心可以实现高光电流密度.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
可再生能源可再生能源是可再生能源.

背景情况:

体量子点 (QD) 是金属氧化物半导体 (MOS) 光电极的有效采光敏感器.
CdSe/CdS核心/外 QD 提供可调的吸收和带对齐,以实现高效的载体分离.
了解核心尺寸对QD光电化学 (PEC) 性能的影响至关重要.

研究的目的:

调查CdSe核心尺寸对CdSe/CdS核心/外QDs的PEC性能的影响.
为了改进气产生,为核心/外QD量身定制带对齐.
为了优化QD敏感的MOS光电极,以实现高效的PEC水分.

主要方法:

合成的CdSe/CdS核心/外 QDs具有不同的CdSe核心直径 (2.84.8 nm),同时保持恒定的CdS外厚度.
使用合成的QDs制造的CdSe/CdS/TiO2光电极.
在模拟的太阳辐射下,描述了PEC性能,包括光电流密度 (Jph).
研究了不同的核心/外架构 (II型,准II型,I型).

主要成果:

通过不同的核心大小成功形成了II型,准II型和I型CdSe/CdS核心/shell架构.
优化的CdSe/CdS/TiO2光电极与3.5纳米CdSe核心实现了和光电流密度 (Jph) 的17.4mA cm-2.2.
通过合金外进行进一步的优化,将Jph提升到22 mA cm−2,证明了基于体QD的电极的最先进性能.

结论:

CdSe核心尺寸显著影响CdSe/CdS核心/外QD的带对齐和PEC性能.
优化核心尺寸和外组成对于最大限度地提高气生产效率至关重要.
这些发现为用于太阳能燃料生产的先进QD敏感光电极铺平了道路.

关键词:

通过光电化学的气产生.吸收范围范围的吸收范围波段对齐带对齐带对齐带对齐运营商转移效率运营商转移效率核心尺寸效应影响核心尺寸的影响

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