Chulhee Lim1,Jinwoo Lee1,Sun-Woo Lee1,Yeonji Jeon1,Seungjin Lee1,Taek-Soo Kim1,Jung-Yong Lee1,Bumjoon Kim1
Korea Advanced Institute of Science and Technology1
Chulhee Lim1,Jinwoo Lee1,Sun-Woo Lee1,Yeonji Jeon1,Seungjin Lee1,Taek-Soo Kim1,Jung-Yong Lee1,Bumjoon Kim1
Korea Advanced Institute of Science and Technology1
A new series of <i>P</i><sub>D</sub>s with oligo ethylene glycol-based flexible spacer (OEG-FS) is developed and demonstrate efficient PSCs with high power conversion efficiency (PCE) of 17.74% processed by hydrocarbon-solvent (toluene) process. This hydrophilic FS alleviates excessive backbone rigidity of the polymer donors (<i>P</i><sub>D</sub>s), while retaining sufficient aggregation in toluene. Also, the FS enhances <i>P</i><sub>D</sub>/SMA interfacial interactions and improves the blend morphology, affording efficient charge generation and mechanical stress dissipation. Therefore, the resulting PSCs with FS incorporated <i>P</i><sub>D</sub> showed superior PCE (17.74%) and crack-onset strain (10.50%) values, outperforming the PSCs without the FS (PCE = 15.7% and COS = 2.99%). More importantly, we develop intrinsically stretchable PSCs (IS-PSCs) with the OEG-FS containing <i>P</i><sub>D</sub>, accomplishing the best performances in terms of both PCE (12.05%) and stretchability (retaining 80% of the initial PCE after 22% strained). This work provides a simple and effective strategy to design <i>P</i><sub>D</sub>s for the efficient, green-solvent processed, and mechanically robust PSCs.