相关实验视频
Updated: Jun 9, 2025
09:51
Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
Published on: April 22, 2013
12.7K
在聚晶薄膜太阳能电池中,带电的颗粒边界和载体重组
1Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA and Maryland NanoCenter, University of Maryland, College Park, MD 20742, USA.
Physical review applied
|October 31, 2024
概括
分析模型显示,单一的供体状态显著抑制了带有正电荷的颗粒边界的pn+连接处的暗重组电流. 这一发现对于优化太阳能电池性能和了解电荷载体重组动态至关重要.
科学领域:
- 半导体物理 半导体物理
- 材料科学 材料科学 材料科学
- 太阳能光伏发电是如何实现的
背景情况:
- 半导体设备中的颗粒边界作为重组中心,影响设备的效率.
- 在某些半导体制造工艺中,正电荷的柱状粒边界很常见.
- 了解粒度边界的缺陷状态对于预测和改进设备性能至关重要.
研究的目的:
- 在带有正电荷的柱状粒边界的 pn+ 交点中推导暗重组电流的分析关系.
- 为了研究不同缺陷状态配置 (单个捐赠者与接受者-捐赠者连续) 对重组的影响.
- 确定这些配置如何影响设备的开放电路电压 (Voc).
主要方法:
- 开发用于暗重组电流的分析模型.
- 数字模拟用于验证理论模型和叠加原理.
- 分析了两个特定的缺陷状态配置:单一的捐赠者和接受者-捐赠者连续.
主要成果:
- 与接受者-捐赠者状态相比,对于单个捐赠状态,粒度边界重组是数量级较低的.
- 重组电流的叠加位置保持在开放电路电压附近.
- 分析关系可以根据短路电流 (Jsc) 和粒度边界特性准确预测Voc.
结论:
- 在带正电荷的粒边界处的缺陷状态配置显著改变了重组率.
- 一个单一的供体状态配置会导致抑制重组,从而可能提高设备的效率.
- 衍生出来的分析关系为预测和优化带有粒度边界的半导体器件中开放电路电压提供了有价值的工具.
相关概念视频
01:22Carrier Generation and Recombination
526
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
526
01:11P-N junction
469
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...
469
01:21Carrier Transport
406
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
406