Elevating dielectric constant via additive engineering: Achieving 19.23% certified efficiency in thick-film binary organic solar cells

IF 35.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Joule Pub Date : 2025-09-22 DOI:10.1016/j.joule.2025.102135

Xinkang Wang, Jifa Wu, Siyu Zhao, Mingqing Chen, Tianyuan Shi, Xianglun Xie, Qingqing Bai, Jialong Xie, Lianjie Zhang, Dongge Ma, Junwu Chen

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Abstract

The realization of highly efficient thick-film organic solar cells (OSCs) is a key path to reaching high-throughput organic photovoltaics. Herein, we demonstrate an additive strategy mediated by tribromopyrimidine (TBP) for optimizing of dielectric constant (ε_r) of organic semiconductor materials along with prolonged exciton diffusion length (L_D) and enhanced vertical phase separation morphology. Based on 100-, 300-, and 500-nm-thick D18:L8-BO active layers, the TBP-treated binary OSCs showed power conversion efficiencies (PCEs) of 20.87%, 19.23%, and 17.82%, respectively, remarkably higher than those of 18.25%, 16.69%, and 13.52% of the corresponding control devices. A certified PCE of 19.23%, a record efficiency, and an exceptional high fill factor of 78.02% were achieved with the TBP-treated 300-nm-thick OSCs. Furthermore, enhanced device stabilities were demonstrated with the TBP-treated devices, retaining 87.9%, 79.4%, and 93.7% of the initial under continuous operational illumination (1,000 h), thermal aging (85°C, 720 h), and storage in air (720 h), respectively.

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通过添加剂工程提高介电常数：在厚膜二元有机太阳能电池中实现19.23%的认证效率

实现高效厚膜有机太阳能电池是实现高通量有机光伏发电的关键途径。在此，我们展示了三溴嘧啶（TBP）介导的添加剂策略，用于优化有机半导体材料的介电常数（εr），延长激子扩散长度（LD）和增强垂直相分离形态。基于100、300和500 nm厚的D18:L8-BO有源层，经过tbp处理的二元osc的功率转换效率（pce）分别为20.87%、19.23%和17.82%，显著高于相应控制器件的18.25%、16.69%和13.52%。经过tbp处理的300纳米厚osc的PCE认证值为19.23%，效率创纪录，填充系数高达78.02%。此外，经过tbp处理的器件在连续工作照明（1,000 h）、热老化（85°C, 720 h）和空气储存（720 h）下的稳定性分别提高了87.9%、79.4%和93.7%。

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来源期刊

Joule Energy-General Energy

CiteScore

53.10

自引率

2.00%

发文量

198

期刊介绍： Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.