잉크젯 프린팅용 페로브스카이트 잉크 용매 제어를 통한 고품질 박막 제조

초록

A key strategy to enhance the performance of perovskite solar cells (PSCs) is the fabrication of high-quality perovskite active layers with uniform morphology and large grain domains in order to reduce defect density and improve charge transport. Inkjet printing presents great potential for scalable PSC fabrication due to its non-contact patterning, minimal material consumption, and compatibility with large-area and flexible substrates. Nevertheless, obtaining uniform and high-quality perovskite films through inkjet printing remains challenging, as it demands sophisticated control over ink formulation and crystallization kinetics. In this work, a facile solvent engineering approach is proposed for the development of inkjet-printable perovskite inks with tailored rheological properties. By introducing high-viscosity co-solvents, the solvent composition was optimized to stabilize droplet jetting and modulate crystal nucleation dynamics. The controlled evaporation rate and delayed crystallization facilitated the growth of large and uniform grains with superior surface coverage. Comprehensive characterization using atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray diffraction (XRD) revealed that the optimized ink formulation produced perovskite films with an average surface roughness reduced by up to 75.6% and improved crystallinity compared to conventional formulations. This simplified solvent engineering strategy, relying solely on ink compositional tuning, offers an efficient pathway toward the scalable production and commercialization of high-performance, inkjet-printed PSCs.

키워드