High Efficiency Perovskite Solar Cells Exceeding 22% via a Photo-Assisted Two-Step Sequential Deposition

Dong Geon Lee, Dong Hoe Kim, Jae Myeong Lee, Byeong Jo Kim, Jun Young Kim, Seong Sik Shin, Hyun Suk Jung

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


One of the most effective methods to achieve high-performance perovskite solar cells (PSCs) is to employ additives as crystallization agents or to passivate defects. Tri-iodide ion has been known as an efficient additive to improve the crystallinity, grain size, and morphology of perovskite films. However, the generation and control of this tri-iodide ion are challenging. Herein, an efficient method to produce tri-iodide ion in a precursor solution using a photoassisted process for application in PSCs is developed. Results suggest that the tri-iodide ion can be synthesized rapidly when formamidinium iodide (FAI) dissolved isopropyl alcohol (IPA) solution is exposed to LED light. Specifically, the photoassisted FAI–IPA solution facilitates the formation of fine perovskite films with high crystallinity, large grain size, and low trap density, thereby improving the device performance up to 22%. This study demonstrates that the photoassisted process in FAI dissolved IPA solution can be an alternative strategy to fabricate highly efficient PSCs with significantly reduced processing times.

Original languageEnglish
Article number2006718
JournalAdvanced Functional Materials
Issue number9
Publication statusPublished - 2021 Feb 24
Externally publishedYes

Bibliographical note

Funding Information:
D.G.L. and D.H.K. contributed equally to this work. This work was supported by the Global Frontier R&D Program of the Center for Multiscale Energy System (2012M3A6A7054855) and Institute of Information & communications Technology Planning & Evaluation (IITP) grant funded by the Korea government (MSIT) (No. 2020-0-00541, Flexible Photovoltaic Device Module with Autonomous Power Supply for Smart Farm Wireless Composite IoT Sensor). This Research has been performed as a project No KS2041-00 (Development of Fine Chemical Material Technology for Industrial Leading) and supported by the KOREA RESEARCH INSTITUTE of CHEMICAL TECHNOLOGY (KRICT). This work was supported by the Basic Research Lab Program of National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT (NRF-2020R1A4A2002161).

Publisher Copyright:
© 2020 Wiley-VCH GmbH


  • additive
  • perovskite
  • photoassisted process
  • tri-iodide ion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Electrochemistry
  • Biomaterials


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