Binary Organic Solar Cells with 19.2% Efficiency Enabled by Solid Additive,Advanced Materials

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Binary Organic Solar Cells with 19.2% Efficiency Enabled by Solid Additive
Advanced Materials ( IF 27.4 ) Pub Date : 2023-03-25 , DOI: 10.1002/adma.202301583
Jianqiu Wang ₁ , Yafei Wang _{1,

2} , Pengqing Bi ₁ , Zhihao Chen ₁ , Jiawei Qiao ₃ , Jiayao Li _{1,

2} , Wenxuan Wang _{1,

2} , Zhong Zheng _{1,

4} , Shaoqing Zhang _{1,

4} , Xiaotao Hao ₃ , Jianhui Hou _{1,

2,

4}

Affiliation

Morphology optimization is critical for achieving high efficiency and stable bulk-heterojunction (BHJ) organic solar cells (OSCs). Herein, the use of 3,5-dichlorobromobenzene (DCBB) with high volatility and low cost to manipulate evolution of the BHJ morphology and improve the operability and photostability of OSCs is proposed. Systematic simulations reveal the charge distribution of DCBB and its non-covalent interaction with the active layer materials. The addition of DCBB can effectively tune the aggregation of PBQx-TF:eC9-2Cl during film formation, resulting in a favorable phase separation and a reinforced molecular packing. As a result, a power conversion efficiency of 19.2% (certified as 19.0% by the National Institute of Metrology) for DCBB-processed PBQx-TF:eC9-2Cl-based OSCs, which is the highest reported value for binary OSCs, is obtained. Importantly, the DCBB-processed devices exhibit superior photostability and have thus considerable application potential in the printing of large-area devices, demonstrating outstanding universality in various BHJ systems. The study provides a facile approach to control the BHJ morphology and enhances the photovoltaic performance of OSCs.

中文翻译：

固体添加剂实现效率高达 19.2% 的二元有机太阳能电池

形态优化对于实现高效率和稳定的体异质结（BHJ）有机太阳能电池（OSC）至关重要。在此，提出使用高挥发性和低成本的3,5-二氯溴苯（DCBB）来操纵BHJ形态的演化并提高OSC的可操作性和光稳定性。系统模拟揭示了 DCBB 的电荷分布及其与活性层材料的非共价相互作用。DCBB的添加可以有效地调节成膜过程中PBQx-TF:eC9-2Cl的聚集，从而产生有利的相分离和增强的分子堆积。结果，经 DCBB 处理的 PBQx-TF:eC9-2Cl 基 OSC 的功率转换效率为 19.2%（经国家计量院认证为 19.0%），这是二元 OSC 的最高报告值。。重要的是，DCBB处理的器件表现出优异的光稳定性，因此在大面积器件的打印中具有相当大的应用潜力，在各种BHJ系统中表现出出色的通用性。该研究提供了一种控制 BHJ 形态并增强 OSC 光伏性能的简便方法。

更新日期：2023-03-25

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