Van der Waals Force-Assisted Heat-Transfer Engineering for Overcoming Limited Efficiency of Flexible Perovskite Solar Cells

Oh Yeong Gong, Gill Sang Han, Sangmyeong Lee, Min Kyeong Seo, Changhwun Sohn, Geon Woo Yoon, Jihun Jang, Jae Myeong Lee, Jin Hyuk Choi, Do Kyoung Lee, Seok Beom Kang, Mansoo Choi, Nam Gyu Park, Dong Hoe Kim, Hyun Suk Jung

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Flexible perovskite solar cells (f-PSCs) have attracted increasing attention for a variety of applications because of their desirable form factor and improved durability. However, the f-PSC fabrication process has not been optimized, resulting in their uneven efficiency. We report a van der Waals stacking (vdWS) process that yields uniform and highly crystalline perovskite films on flexible substrates by uniform heat transfer during the perovskite annealing process. In addition, the surface and grain boundary defects on the perovskite film were effectively minimized with the vacuum-assisted passivation post-treatment; accordingly, the environmental and mechanical stabilities of f-PSCs were enhanced. Also, the best f-PSC with an active area of 0.14 cm2achieved power conversion efficiencies (PCEs) of 41.23% and 22.54% under 1000 lx and 1 sun illuminations, respectively. Furthermore, the vdWS process showed scalable uniformity through flexible perovskite solar minimodules with a certified PCE of 18.35% in an active area of 48.90

Original languageEnglish
Pages (from-to)2893-2903
Number of pages11
JournalACS Energy Letters
Issue number9
Publication statusPublished - 2022 Sept 9

Bibliographical note

Funding Information:
This research was supported by the National Research Foundation of Korea (NRF, 2020R1A2C1102718, 2020R1A4A2002161, and 2021R1A3B1076723) and the Institute of Information & Communications Technology Planning & Evaluation (IITP, 2020-0-00541) funded by the Ministry of Science and ICT (MSIT) of Republic of Korea. This research was supported by the Korea Evaluation Institute of Industrial Technology (KEIT, 20016588) and Korea Institute of Energy Technology Evaluation and Planning (KETEP, 20203040010320) funded by the Ministry of Trade, Industry and Energy (MOTIE) of Republic of Korea.

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry


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