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通过简单的EL De-Convolution在非完全烯有机太阳能电池中研究洞转移动力学

Dongchan Lee¹, Do Hui Kim¹, Chang-Mok Oh²

¹Department of Semiconductor Physics and EHSRC, University of Ulsan, Ulsan 44610, Republic of Korea.

|October 28, 2023

概括

研究人员开发了一种新方法来确定非富勒烯有机太阳能电池中确切的孔电荷转移状态 (hCT). 这种技术通过解电发光光谱,有助于优化捐赠者-接受器能量水平,以提高设备性能.

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:

传统的有机光伏 (OPV) 依赖于电子电荷转移状态 (eCT).
基于非富勒烯受体 (NFA) 的散装异构连接 (BHJ) 系统更受孔电荷转移状态 (hCT) 的影响.
精确确定hCT对于提高基于NFA的有机太阳能电池性能至关重要.

研究的目的:

引入一种简单有效的方法来确定BHJ系统中确切的hCT水平.
通过多种不同的捐赠者-接受者组合来验证该方法.
为有机太阳能电池提供精确能级调整的途径.

主要方法:

BHJ混合物 (ELB) 的电解发光 (EL) 光谱的解卷.
将ELB解卷方法应用于九个不同的BHJ系统 (三个捐助者,三个NFA).
在特定条件下的分析:分离的供体-受体吸收和受体主导的EQE发作.

主要成果:

通过ELB解卷方法,通过hCT成功分离了单点重组和辐射重组的贡献.
确定了ELB的特定光谱区域,这些区域与应用马库斯理论有关.
证明了该方法在各种捐赠者-NFA组合中的适用性.

结论:

开发的ELB解卷方法准确地确定了基于NFA的OPV中的hCT水平.
这种精确的确定有助于更清楚地理解负荷转移机制.
预计这些发现将在微调能量水平方面显著有助于提高有机太阳能电池效率.

关键词:

收费转移状态状态收费转移状态能量损失,能量损失.洞运输洞运输洞运输非富勒受体的非富勒受体有机太阳能电池是有机太阳能电池.

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P-N junction

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...