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.
Bibliographical noteFunding 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).
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- photoassisted process
- tri-iodide ion
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Materials Science(all)