Shin, Eul-Yong Park, Jaehyeong Kim, Dong Jun Park, So Hyun Kim, Kyuyeon Go, Enoch Kim, Kyeongmin Jin, Hyunjung Kim, Jung Sue Noh, Jun Hong Baek, Se-Woong Chae, Boknam Kim, Taek-Soo Lee, Eunji Chung, Seungjun Jang, Yoon Hee Son, Hae Jung 2024-10-26T06:30:14Z 2024-10-26T06:30:14Z 2024-10-25 2024-11 1385-8947 https://pubs.kist.re.kr/handle/201004/150853 It is important to develop bulk-heterojunction films that simultaneously exhibit good photovoltaic properties and mechanical robustness to realize intrinsically stretchable organic photovoltaics (IS-OPVs). We developed a strategy for preparing nanoporous bulk-heterojunction (np-BHJ) films at a large area by nonsolvent-induced phase separation assisted by thermoplastic polyurethane. The resulting np-BHJ can form much improved adhesive interfaces with a neighbored stretchable layer in OPV devices and effectively dissipate applied mechanical stress. IS-OPVs using the np-BHJ films showed efficiency of 12.0 %, which is comparable performance to 12.4 % of the controlled BHJ. The IS-OPV device using np-BHJ films much improved mechanical stability and maintained 89 % of its initial efficiency under applied strain of 40 %. The corresponding module showed only 10 % decrease in efficiency after 1,000 cycles in stretching tests at 10 % strain. Because of high scalability of the npBHJ morphology, IS-OPV modules with efficiency of 7.06 % and active area of 10.17 cm2 2 and were successfully demonstrated. Photoplethysmography sensors prepared using the IS-OPV module showed strong potential for application in wearable electronics. English Elsevier BV Highly mechanically stable and intrinsically stretchable large-area organic photovoltaics using nanoporous bulk-heterojunction Article 10.1016/j.cej.2024.156116 1 Chemical Engineering Journal, v.499 Chemical Engineering Journal 499 N scie scopus 001328750200001 2-s2.0-85204995176 Engineering, Environmental Engineering, Chemical Engineering Article SEMICONDUCTORS Intrinsically stretchable organic photovoltaics Nanoporous bulk-heterojunction Nonsolvent-induced phase separation Thermoplastic polyurethane Interfacial adhesion module