使用CdSe量子点对p-GaP的敏感化:光刺激的注射孔注射孔
Zhijie Wang1, Anisha Shakya, Junsi Gu
1Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States.
Journal of the American Chemical Society
|June 11, 2013
概括
化 (CdSe) 量子点增强了化 (GaP) 光电极的光吸收. 这种敏感性使得洞注射效率高,为基于量子点的太阳能转换开辟了新的途径.
科学领域:
- 材料科学 材料科学 材料科学
- 摄影化学的使用.
- 纳米技术纳米技术
背景情况:
- 量子点 (QD) 是光电化学系统中有前途的光采集元件.
- 化 (GaP) 是一种半导体,具有光电化学应用的潜力.
- 了解QD半导体接口上的电荷传输机制对于设备效率至关重要.
研究的目的:
- 为了研究p型化 (p-GaP) 通过吸附化 (CdSe) 量子点的敏感化.
- 探索从CdSe QDs到p-GaP的电荷注入机制 (孔与电子).
- 评估这种材料组合对光电化学能量转换的潜力.
主要方法:
- 制造非退化合的平面p-GaP(100) 光电极.
- 在p-GaP表面上CdSe量子点 (3.14.5nm直径) 的吸附.
- 在含有Eu(3+/2+) 的水性电解质中进行光电化学测量.
- 时间解析光发光衰变分析.
主要成果:
- 观察到CdSe QD敏感的p-GaP的子频段间隙光响应性 (>550 nm).
- 从CdSe QDs向p-GaP基质注入敏感孔的证据.
- 光发光衰变数据证实了电荷转移机制.
结论:
- CdSe量子点有效地使p-GaP敏感,使光响应能够超出其内在带间隙.
- 观察到的孔注入机制与其他QD/金属氧化物系统中的电子注入有所不同.
- 这一发现扩大了用于能量转换的QD增强光电化学设备的设计可能性.
相关概念视频
Biasing of P-N Junction
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
P-N junction
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
G-Protein Gated Ion Channels
GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...
Sensory organs,...


