Terbium‐Doped and Dual‐Passivated γ‐CsPb(I1−xBrx)3 Inorganic Perovskite Solar Cells with Improved Air Thermal Stability and High Efficiency

• DOI: 10.1002/adma.202203204
• Publication Date: 2022-05-18T01:59:02Z
• Authors: Sawanta S. Mali; Jyoti V. Patil; Sachin R. Rondiya; Nelson Y. Dzade; Julian A. Steele; Mohammad Khaja Na...; Pramod S. Patil; Chang Kook Hong
• Keywords: Passivation; Thermal Stability; Hysteresis

Realizing photoactive and thermodynamically stable all-inorganic perovskite solar cells (PSCs) remains a challenging task within halide photovoltaic (PV) research. Here, dual strategy for realizing efficient inorganic mixed PV devices based on terbium-doped absorber, that is, CsPb1-x Tbx I2 Br, is reported, which undertakes bulk surface passivation treatment in the form of Br quantum dots, to maintain γ-phase under ambient conditions with significantly improved operational stability. Devices fabricated from these air-processed thin films exhibit an air-stable power conversion efficiency (PCE) reaches 17.51% (small-area devices) negligible hysteresis maintains >90% initial when operating 600 h harsh environmental conditions, stemming combined effects dual-protection strategy. This approach further examined large-area PSC modules (19.8 cm2 active area) realize 10.94% PCE >30 days stability, as well low-bandgap γ-CsPb0.95 Tb0.05 I2.5 Br0.5 (Eg = 1.73 eV) materials, yielding 19.01% (18.43% certified) PCE.