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P3HT的降解机制:基于PCBM的散装异质连接太阳能电池

Tirukoti Mounika¹, Manshi Singh², Inderpreet Singh²

¹Environmental Chemistry Laboratory, Department of Studies in Environmental Science, University of Mysore, Manasagangothri, Mysore, Karnataka, 570006, India.

|May 8, 2025

概括

这项研究研究了使用PC60BM和PC70BM受体的P3HT:PCBM太阳能电池的降解. 由于陷状态,PC70BM细胞显示出快速的光转换效率 (PCE) 降低,而PC60BM细胞降解速度较慢.

科学领域:

材料科学材料科学材料科学
可再生能源是可再生能源的来源.
有机电子有机电子

背景情况:

基于P3HT:PCBM的批量异质连接 (BHJ) 太阳能电池对低成本的可再生能源充满希望.
了解降解机制对于提高设备稳定性和寿命至关重要.
不同的富勒烯衍生物,如PC60BM和PC70BM,影响设备的性能和稳定性.

研究的目的:

研究和比较使用PC60BM和PC70BM接受器材料的P3HT:PCBM太阳能电池的降解机制.
阐明导致光转换效率 (PCE) 随着时间的推移而下降的因素.
为了将受体中的结构差异与观察到的降解率相关联.

主要方法:

ITO/PEDOT:PSS/P3HT:PCBM/Al太阳能电池设备的制造,使用PC60BM和PC70BM作为接受器材料.
随着时间的推移,对光转换效率 (PCE) 的监测,以评估设备的退化.
对两种类型的设备的降解率和和点的分析.

主要成果:

两种PC60BM和PC70BM设备的初始PCE约为3.8%.
PC60BM设备显示出更高的初始降解率,在100分钟后和约2%的PCE.
大约170分钟后,PC70BM设备的降解率突然增加,导致250分钟后PCE急剧下降至2%以下.

结论:

PC70BM分子的非球形结构导致陷状态的形成,加速了设备的降解.
基于PC70BM的太阳能电池与基于PC60BM的电池相比,具有更明显和更快的降解途径.
定制受体形态对于提高P3HT:PCBM批量异质连接太阳能电池的运行稳定性至关重要.

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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...