Correlating crystallinity and performance in single-component organic solar cells based on double-cable conjugated polymers

IF 5.4 1区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY GIANT Pub Date : 2024-07-08 DOI:10.1016/j.giant.2024.100322
Zhou Zhang , Qiaomei Chen , Jing Wang , Chengyi Xiao , Zheng Tang , Christopher R. McNeill , Weiwei Li
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Abstract

The thin film morphology of double-cable conjugated polymers is critical to the performance of single-component organic solar cells (SCOSCs). Here, we explore the effect of thin film crystallinity on device performance by varying the thermal annealing temperature used during device fabrication. Our investigations reveal that a moderate annealing temperature of 150 °C optimizes the power conversion efficiency in SCOSCs. Although higher annealing temperatures leads to increased crystalline order, a decrease in device performance is observed, attributed to imbalanced carrier transport and increased charge recombination. Additionally, the progressive decrease in the open-circuit voltage of these cells with increasing annealing temperature is linked to augmented non-radiative voltage losses, stemming from the increase in film crystallinity. This study underscores the critical necessity of achieving a delicate optimization of film microstructure in order to maximize the efficiency of SCOSCs, while also delineating prospective avenues for refining the molecular design and processing of double-cable polymers to bolster solar cell performance.

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基于双缆共轭聚合物的单组分有机太阳能电池的结晶度与性能相关性
双电缆共轭聚合物的薄膜形态对于单组分有机太阳能电池 (SCOSC) 的性能至关重要。在此,我们通过改变器件制造过程中使用的热退火温度来探索薄膜结晶度对器件性能的影响。我们的研究发现,150 °C 的适度退火温度可优化 SCOSC 的功率转换效率。虽然较高的退火温度会导致晶体阶数增加,但器件性能却会下降,这归因于载流子传输失衡和电荷重组增加。此外,这些电池的开路电压随着退火温度的升高而逐渐降低,这与薄膜结晶度增加导致的非辐射电压损耗增加有关。这项研究强调了实现薄膜微观结构精细优化的重要性,以便最大限度地提高 SCOSC 的效率,同时也为完善双电缆聚合物的分子设计和加工以提高太阳能电池的性能指明了前景广阔的途径。
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来源期刊
GIANT
GIANT Multiple-
CiteScore
8.50
自引率
8.60%
发文量
46
审稿时长
42 days
期刊介绍: Giant is an interdisciplinary title focusing on fundamental and applied macromolecular science spanning all chemistry, physics, biology, and materials aspects of the field in the broadest sense. Key areas covered include macromolecular chemistry, supramolecular assembly, multiscale and multifunctional materials, organic-inorganic hybrid materials, biophysics, biomimetics and surface science. Core topics range from developments in synthesis, characterisation and assembly towards creating uniformly sized precision macromolecules with tailored properties, to the design and assembly of nanostructured materials in multiple dimensions, and further to the study of smart or living designer materials with tuneable multiscale properties.
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