在基于随机聚合物供体的非富勒烯聚合物太阳能电池中,电荷光生成动态
Jianbin Zhong1, Rong Hu2, Zheng Zou1
1School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China.
The Journal of chemical physics
|March 5, 2025
概括
将第三个组件添加到聚合物半导体中可以改善聚合物太阳能电池 (PSC). 少量硫-硫酸 (TTz) 增强了刺激子的扩散长度,而较大量则减少了它. 能量水平的抵消是充电生成的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 太阳能光伏发电是如何实现的
背景情况:
- 随机三元聚合提供了一种方法来调整聚合物半导体特性,用于聚合物太阳能电池 (PSC).
- 纳入第三个组件对特聚合物太阳能电池中激子动力学和电荷光生成的具体影响仍然不完全理解.
研究的目的:
- 为了研究硫-硫酸 (TTz) 含量对激素特性的影响,并在基于聚合物的PSC中进行充电光生成.
- 阐明能量水平偏移在这些聚合物系统内有效电荷分离中的作用.
主要方法:
- 利用时间分辨率光谱仪来分析激子的行为.
- 制造和测试的聚合物太阳能电池具有不同的TTz含量 (PM1: 20% TTz,PM2: 50% TTz),并与Y6接受器混合.
主要成果:
- 在整洁的薄膜中,20%的TTz结合增加了刺激子扩散长度,从而增加了寿命,而50%的TTz则减少了寿命.
- 与Y6混合的薄膜显示出高效的激子解离,PM1 (20% TTz) 减少相位大小并抑制重组.
- 发现0.06 eV的HOMO能量水平偏移有效地解离了terpolymer:Y6混合物的激子.
结论:
- 第三个组成部分 (TTz) 的度极大地影响了聚合物中的激子扩散和寿命.
- 聚合物组合和能量水平与像Y6这样的受体对齐对于优化PSC中的电荷光生成和性能至关重要.
- 战略性纳入TTz和精确的能量水平抵消可以通过控制激子动态和重组来提高PSC的效率.
更多相关视频
07:32Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization
Published on: January 29, 2017
10.4K
06:49In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
Published on: March 2, 2021
6.2K
相关概念视频
P-N junction
442
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...
442
Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.8K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Carrier Generation and Recombination
487
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...
487
Cationic Chain-Growth Polymerization: Mechanism
2.2K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.2K
