[논문]Highly efficient and stable flexible perovskite solar cells enabled by using plasma-polymerized-fluorocarbon antireflection layer

Cho, Eunmi; Kim, Young Yun; Ham, Dong Seok; Lee, Jae Heung; Park, Jin-Seong; Seo, Jangwon; Lee, Sang-Jin

doi:10.1016/j.nanoen.2020.105737

[해외논문] Highly efficient and stable flexible perovskite solar cells enabled by using plasma-polymerized-fluorocarbon antireflection layer

Nano energy, v.82, 2021년, pp.105737 -

Cho, Eunmi (Chemical Materials Solutions Center, Korea Research Institute of Chemical Technology (KRICT)) , Kim, Young Yun (Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT)) , Ham, Dong Seok (Chemical Materials Solutions Center, Korea Research Institute of Chemical Technology (KRICT)) , Lee, Jae Heung (Chemical Materials Solutions Center, Korea Research Institute of Chemical Technology (KRICT)) , Park, Jin-Seong (Department of Materials Science and Engineering, Hanyang University) , Seo, Jangwon (Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT)) , Lee, Sang-Jin (Chemical Materials Solutions Center, Korea Research Institute of Chemical Technology (KRICT))

Abstract ▼ AI-Helper

Abstract Despite of enormous potential in niche applications, flexible perovskite solar cells (F-PSCs) still suffer from low power conversion efficiency (PCE) compared to rigid PSCs largely because of the reduced photocurrent driven by low transmittance of their flexible substrate and transparent electrode. This paper presents a plasma-polymerized-fluorocarbon (PPFC) thin film as an antireflection (AR) coating material for enhancing the efficiency of F-PSCs. The PPFC, which are deposited on flexible polyethylene terephthalate (PET) substrates at low temperature by a mid-range frequency sputtering process, are highly transparent because of their amorphous structure. Due to the very low refractive index (~ 1.38) of PPFC over a wide wavelength range, these thin films decrease the average reflectance by 2.22% and increase the average transmittance in the visible light region by 1.40%. As a result, the AR films increase the PCE of F-PSCs from 18.6% to 20.4%. The thin films have a self-cleaning effect due to their hydrophobic surface, excellent mechanical flexibility (bending radius: 4 mm), and high chemical stability. Accordingly, the thin films improve the long-term stability of F-PSCs in humid environments. Finally, these AR PPFC thin films can be manufactured by a roll-to-roll process, making them suitable for future use in highly efficient F-PSCs. Highlights The plasma-polymerized-fluorocarbon (PPFC) thin film is introduced as an antireflection (AR) film on the flexible substrate. PPFC AR coating effectively improves transmittance due to its low refractive index (~1.38) over a wide wavelength range. The AR PPFC thin film enhances the efficiency of flexible perovskite solar cells (F-PSCs) from 18.6% to 20.4%. The PPFC film exhibits self-cleaning effect due to its hydrophobic surface. The hydrophobic nature of PPFC film aids to improve the long-term stability of F-PSCs under high humidity. The PPFC thin films shows excellent stability under humidity, heat, and chemicals, and retains its form after bending test. Graphical Abstract The plasma-polymerized-fluorocarbon (PPFC) films have an antireflection (AR) effect due to low refractive index (~ 1.38), self-cleaning effect due to their hydrophobic surface, excellent mechanical flexibility, and chemical stability. As a result, the AR PPFC films increase the power conversion efficiency of flexible perovskite solar cells (F-PSCs) from 18.6% to 20.4%, and improve the long-term stability of F-PSCs in humid environments. [DISPLAY OMISSION]

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