O. Omelianovych, H-S. Choi
Chungnam National University, Daejeon, South Korea
Keywords: Surface plasmon resonance, perovskite solar cells, TiN nanoparticles, crystallization control, non-radiative recombination
Incorporating noble-metal plasmonic nanoparticles (NPs) enhances the optoelectronic properties of perovskite solar cells (PSCs) but at a higher cost. In this work, we highlight the overlooked potential of refractory plasmonic materials as a cost-effective alternative additive in PSC research. Our investigation aims to stimulate interest in this area by showcasing the theoretical and practical impacts of TiN plasmonic NPs when integrated into PSCs. TiN plasmonic NPs present a cost-effective yet underexplored option. Our study explores the impact of TiN NPs on PSCs through theoretical and experimental approaches. Finite-difference time-domain (FDTD) optical simulations and empirical data indicate that TiN NPs increase absorption and reduce reflectance in PSCs, driven by surface plasmon resonance and the significant growth of perovskite grains from 450 nm to 1400 nm. These NPs also regulate the perovskite crystallization rate by adsorbing DMF/DMSO, fostering larger grain formation. Improved band alignment and decreased trap states enhance charge transport and diminish non-radiative recombination losses. As a result, PSC efficiency with optimal TiN NP concentration increased from 19.07% to 21.37%. Additionally, TiN-enhanced PSCs display better stability, retaining 98.1% of their original PCE after 31 days under ambient conditions.