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Advanced Devices for Energy Conversion

Journals

Advanced Energy Materials
년도 2024
학술지명 Advanced Energy Materials
논문명 Establishing Co-Continuous Network of Conjugated Polymers and Elastomers for High-Performance Polymer Solar Cells with Extreme Stretchability
게재권/집 14/26
수록페이지 2401191
저자명 Jin-Woo Lee†, Trieu Hoang-Quan Nguyen†, Eun Sung Oh, Seungbok Lee, Jaeyoung Choi, Hyun Soo Kwon, Cheng Wang, Seungjin Lee, Jung-Yong Lee, Taek-Soo Kim, Bumjoon J. Kim*
Link 관련링크 https://doi.org/10.1002/aenm.202401191 529회 연결

Abstract

  

High power conversion efficiency (PCE) and mechanical robustness are prerequisites for wearable applications of organic solar cells (OSCs). However, stretchability of present active systems (i.e., crack-onset strain (COS) < 30%) should be improved. While introducing elastomers into active systems is considered a simple method for improving stretchability, the inclusion of elastomers typically results in a decrease in PCE of the OSC with a limited enhancement in the stretchability due to lack of interconnected electrical and mechanical pathways. In this study, it is developed efficient and intrinsically stretchable (IS)-OSCs with exceptional mechanical robustness, by constructing co-continuous networks of conjugated polymers (D18) and elastomers (SEBS) within active layers. It is demonstrated that the blend film with a specific ratio (40:60 w/w) of D18:SEBS is crucial for forming co-continuous structures, establishing well-connected mechanical and electrical channels. Consequently, D180.4:SEBS0.6/L8-BO OSCs achieve 16-times higher stretchability (COS = 126%) than the OSCs based on D18/L8-BO (COS = 8%), while achieving 4-times higher PCE (12.13%) compared to the OSCs based on SEBS-rich active layers (D180.2:SEBS0.8/L8-BO, PCE = 3.15%). Furthermore, D180.4:SEBS0.6-based IS-OSCs preserve 86 and 90% of original PCEs at 50% strain and after 200 stretching/releasing cycles with 15% strain, respectively, demonstrating the highest mechanical robustness among reported IS-OSCs.