Статья

Simple Polythiophene Solar Cells Approaching 10% Efficiency via Carbon Chain Length Modulation of Poly(3-alkylthiophene)

Yang LiuSchool of Materials Science and Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin 300350, ChinaKaihu XianSchool of Materials Science and Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin 300350, ChinaRuohua GuiSchool of Physics, Shandong University, Jinan 250100, ChinaKangkang ZhouSchool of Materials Science and Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin 300350, ChinaJunwei LiuSchool of Materials Science and Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin 300350, ChinaMengyuan GaoSchool of Materials Science and Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin 300350, ChinaWenchao ZhaoCo-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, ChinaXuechen JiaoNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, ChinaYunfeng DengSchool of Materials Science and Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin 300350, ChinaHang YinSchool of Physics, Shandong University, Jinan 250100, ChinaYanhou GengInternational Campus of Tianjin University, Joint School of National University of Singapore and Tianjin University, Binhai New City, Fuzhou 350207, ChinaLong YeSchool of Materials Science and Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin 300350, China

2021en

ABI

Аннотация

Poly(3-alkylthiophene)s are the most extensively studied polymeric materials in organic and hybrid solar cells due to the unique advantages of extremely low cost in material synthesis. However, the inferior power conversion efficiencies (PCEs) are still the main obstacle in the commercial applications of poly(3-alkylthiophene)-based solar cells. In this contribution, the carbon chain length of poly(3-alkylthiophene) is modulated to reveal its impact on the molecular packing and charge transport behaviors in neat films and bulk heterojunction films with nonfullerene small-molecule acceptors for the first time. The odd–even effect can be clearly observed in poly(3-alkylthiophene):ZY-4Cl bulk heterojunction films, which has a great impact on the charge transport behavior and device performance. The poly(3-pentylthiophene) (P3PT) cell achieves a significantly high PCE of nearly 10% and a desirable fill factor of ∼71%, which are the highest values of P3PT-based solar cells to date. The boosted efficiency is attributed to the altered van der Waals surfaces of alkyl segments through density functional theory calculation. This work reveals the odd–even effects of the carbon chain length modulation on the molecular packing and interaction of polythiophene:nonfullerene blends, which casts a new light on optimizing low-cost polythiophene solar cells and other promising electronics.

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Идентификаторы

DOI: 10.1021/acs.macromol.1c02187

Цитирования и источники

Цитирований: 5Использованных источников: 0

Показатели — AkademScholar