Aggregation‐Induced Multilength Scaled Morphology Enabling 11.76% Efficiency in All‐Polymer Solar Cells Using Printing Fabrication

Journal Article · Wed Aug 28 00:00:00 EDT 2019 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201902899· OSTI ID:1559051

Zhu, Lei  ^[1]; Zhong, Wenkai ^[2]; Qiu, Chaoqun ^[3]; Lyu, Bosai ^[4]; Zhou, Zichun ^[3]; Zhang, Ming ^[4]; Song, Jingnan ^[4]; Xu, Jinqiu ^[4]; Wang, Jing ^[4]; Ali, Jazib ^[4]; Feng, Wei ^[5]; Shi, Zhiwen ^[4]; Gu, Xiaodan ^[6]; Ying, Lei ^[2]; Zhang, Yongming ^[3]; Liu, Feng  ^[7]

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1. Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China, State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
2. State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
3. Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China
4. School of Physics and Astronomy and Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiao Tong University Shanghai 200240 P. R. China
5. State Key Laboratory of Fluorinated Materials Zibo City Shandong Province 256401 P. R. China
6. School of Polymer Science and Engineering The University of Southern Mississippi Hattiesburg MS 39406 USA
7. Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China, School of Physics and Astronomy and Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiao Tong University Shanghai 200240 P. R. China

Abstract All‐polymer solar cells (all‐PSCs) exhibit excellent stability and readily tunable ink viscosity, and are therefore especially suitable for printing preparation of large‐scale devices. At present, the efficiency of state‐of‐the‐art all‐PSCs fabricated by the spin‐coating method has exceeded 11%, laying the foundation for the preparation and practical utilization of printed devices. A high power conversion efficiency (PCE) of 11.76% is achieved based on PTzBI‐Si:N2200 all‐PSCs processing with 2‐methyltetrahydrofuran (MTHF, an environmentally friendly solvent) and preparation of active layers by slot die printing, which is the top efficient for all‐PSCs. Conversely, the PCE of devices processed by high‐boiling point chlorobenzene is less than 2%. Through the study of film formation kinetics, volatile solvents can freeze the morphology in a short time, and a more rigid conformation with strong intermolecular interaction combined with the solubility limit of PTzBI‐Si and N2200 in MTHF results in the formation of a fibril network in the bulk heterojunction. The multilength scaled morphology ensures fast transfer of carriers and facilitates exciton separation, which boosts carrier mobility and current density, thus improving the device performance. These results are of great significance for large‐scale printing fabrication of high‐efficiency all‐PSCs in the future.

• Sponsoring Organization: USDOE
• OSTI ID: 1559051
• Journal Information: Advanced Materials, Journal Name: Advanced Materials Vol. 31 Journal Issue: 41; ISSN 0935-9648
• Publisher: Wiley Blackwell (John Wiley & Sons)
• Country of Publication: Germany
• Language: English