POS5-0474
Pure-FAPbI3 Perovskite Solar Cells via Butanol-Assisted Printing-Friendly Sequential Deposition
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Minwoo Lee (Gwangju Institute of Science and Technology(GIST))
Co-Author(s)
Abstract
While lab-scale perovskite solar cells (PSCs) have achieved unprecedented efficiencies exceeding 27%, commercializing large-area modules remains severely hindered by scaling bottlenecks. Conventional sequential deposition relies on dynamic spin-coating and rigorous thermal annealing to control crystallization, making it fundamentally incompatible with continuous manufacturing techniques in Roll-to-Roll processing. To resolve this critical lab-to-fab gap, printing-friendly sequential deposition (PFSD) has emerged as a breakthrough strategy. By employing an intra-additive in the precursor, PFSD spontaneously forms a distinctive PbI2 framework without any solvent additive such as dmso, entirely eliminating the need for complex post-treatments. Despite these scalable advantages, applying PFSD to the highly desirable pure-formamidinium lead iodide (FAPbI3) system has been profoundly challenging. Utilizing conventional isopropanol (IPA) as the solvent for organic salts results in incomplete phase conversion and severely degraded film morphology in PFSD. Herein, we overcome this limitation by substituting conventional IPA with 1-butanol in PFSD strategy, enabling the successful fabrication of highly crystalline, printable pure-FAPbI3. This solvent engineering introduces three pivotal advantages. First, the extended dwell time of 1-butanol substantially facilitates deep and uniform FAI penetration into the mesoporous PbI2 lattice compared to IPA-based precursors. Second, its inherently low evaporation rate orchestrates crystallization kinetics, suppressing defect densities and promoting a high-quality α-phase film. Third, its low hygroscopicity effectively mitigates moisture ingress, ensuring highly reproducible processing under fully ambient-air conditions. Consequently, leveraging this butanol-assisted PFSD, we demonstrate fully printed pure-FAPbI3 PSCs achieving efficiencies >20%, establishing a slot-die compatible paradigm for scalable PSC commercialization.
