Establishing Co‐Continuous Network of Conjugated Polymers and Elastomers for High‐Performance Polymer Solar Cells with Extreme Stretchability

• DOI: 10.1002/aenm.202401191
• Publication Date: 2024-05-13T11:50:16Z
• Authors: Jin‐Woo Lee; Trieu Hoang‐Quan ...; Eun Sung Oh; Seungbok Lee; Jaeyoung Choi; Hyun Soo Kwon; Cheng Wang; Seungjin Lee; Jung‐Yong Lee; Taek‐Soo Kim; Bumjoon J. Kim
• Keywords: Robustness

Abstract High power conversion efficiency (PCE) and mechanical robustness are prerequisites for wearable applications of organic solar cells (OSCs). However, stretchability present active systems (i.e., crack‐onset strain (COS) < 30%) should be improved. While introducing elastomers into is considered a simple method improving stretchability, the inclusion typically results in decrease PCE OSC with limited enhancement due to lack interconnected electrical pathways. In this study, it developed efficient intrinsically stretchable (IS)‐OSCs exceptional robustness, by constructing co‐continuous networks conjugated polymers (D18) (SEBS) within layers. It demonstrated that blend film specific ratio (40:60 w/w) D18:SEBS crucial forming structures, establishing well‐connected channels. Consequently, D18 0.4 :SEBS 0.6 /L8‐BO OSCs achieve 16‐times higher (COS = 126%) than based on D18/L8‐BO 8%), while achieving 4‐times (12.13%) compared SEBS‐rich layers (D18 0.2 0.8 /L8‐BO, 3.15%). Furthermore, ‐based IS‐OSCs preserve 86 90% original PCEs at 50% after 200 stretching/releasing cycles 15% strain, respectively, demonstrating highest among reported IS‐OSCs.