Synergistic Approach toward Erbium-Passivated Triple-Anion Organic-Free Perovskite Solar Cells with Excellent...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• All-inorganic perovskite solar cells (IPSCs) offer improved stability over hybrid organic-inorganic counterparts.
• CsPbX3 (X = Cl, I, Br) inorganic perovskites are key materials, with CsPbIBr2 offering a 2.03 eV bandgap and enhanced stability for photovoltaics.

Purpose of the Study:

• To develop an organic-free, triple-anion CsPbIBr2 perovskite solar cell (PSC) using a synergistic approach.
• To enhance carrier diffusion length, crystalline grain size, and interface stability.
• To investigate the impact of Erbium passivation on device performance and voltage (VOC) despite halide segregation.

Main Methods:

• A synergistic approach combining pre-heated solution dropping with inorganic additive inclusion.
• Fabrication of Erbium (Er)-passivated CsI(PbBr2)0.97(ErCl3)0.03 IPSCs with inorganic carrier selective layers (CTLs).
• Utilizing Erbium passivation to suppress trap-state densities and stabilize CTL/perovskite active layer (PAL) interfaces.

Main Results:

• Enhanced carrier diffusion length and crystalline grain size were observed.
• Reduced grain boundaries at CTL/PAL interfaces led to suppressed trap-state densities.
• Achieved a notable open-circuit voltage (VOC) of ~1.34 V, contradicting common beliefs about halide segregation losses.
• Optimized organic-free IPSC demonstrated a power conversion efficiency (PCE) of 11.61% and stabilized power output of 10.72%.

Conclusions:

• The developed organic-free IPSC demonstrates high efficiency and voltage, challenging existing assumptions about halide segregation.
• The synergistic approach and Erbium passivation are effective in enhancing device performance and stability.
• The results indicate significant potential for integrating these IPSCs into agrivoltaics (AgV) projects.