Jeong, Inyoung Lee, Tae Kyung Van Tran, Hung Hwang, Inchan Hwang, Jiseon Lee, Ahreum Ham, Seungsik Tran, Huyen Cho, Yunae Shin, Donghyeop Song, Soomin Lee, Sangmin Ahn, Seung Kyu Eo, Young-Joo Cho, Ara Park, Joo Hyung Cho, Jun-Sik Byeon, Junseop Kim, Won Mok Yun, Jae Ho Gwak, Jihye Hong, Sungjun Ahn, Sejin Kim, Hae-Jin Kim, Kihwan 2025-04-09T07:00:12Z 2025-04-09T07:00:12Z 2025-04-09 2025-03 2542-4351 https://pubs.kist.re.kr/handle/201004/152188 Flexible perovskite/Cu(In,Ga)Se2 (PVSK/CIGS) tandem solar cells (F-PCTSCs) can serve as lightweight and cost-effective power sources suitable for versatile applications; however, technical challenges impede their implementation. In this study, we adopted a straightforward lift-off process based on a polyimide (PI)-coated soda-lime glass (SLG) substrate for fabricating high-performance F-PCTSCs while addressing key technical challenges. The CIGS films grown on a PI-coated SLG substrate exhibited larger grains and higher carrier concentrations compared with their counterparts grown on bare SLG, as well as alleviated charge recombination. These enhancements were attributed to the suppression of alkali metal diffusion by the PI interlayer during the film growth, which resulted in superior device performance. Building on this approach, we fabricated efficient and lightweight F-PCTSCs that delivered a state-of-the-art power conversion efficiency of 23.64% (certified 22.8%) and high power-per-weight of 6.15 W g-1, which is significantly greater than that of PVSK/silicon tandem solar cells (0.65 W g-1). English CELL PRESS Flexible and lightweight perovskite/Cu(In,Ga)Se2 tandem solar cells Article 10.1016/j.joule.2024.11.011 1 Joule, v.9, no.3 Joule 9 3 N scie scopus 001454704600001 2-s2.0-85214321832 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article ELECTRONIC POPULATION ANALYSIS THIN-FILMS EFFICIENCY HARDNESS