Stacking Interactions and Photovoltaic Performance of Cs₂AgBiBr₆ Perovskite

Abstract

Elpasolite Cs2AgBiBr6 also known as double perovskite has been touted in recent years as a promising alternative to the lead‐based perovskite for light harvesting. Its structure and properties mainly stem from the replacement of Pb2+ cation with a pair of aliovalent silver (Ag+) and bismuth (Bi3+) cations. Although the elpasolite Cs2AgBiBr6 exhibits improved stability, its photophysical properties and device performance are inferior to those of the Pb‐based perovskites. To date, numerous efforts have been geared toward the development of efficient Cs2AgBiBr6 solar cells. However, the indirect, wide bandgap and high exciton binding energy of Cs2AgBiBr6 have limited such efforts. This has been attributed to its low (zero) electronic dimensionality (0D), formation of small polaronic states, and interfacial imperfections with charge transporting layers. In this review, the different aspects of the elpasolite Cs2AgBiBr6 in relation to compositional and interlayer interactions in solar cell are discussed, and its suitability for photovoltaic application is assessed, accompanied by potential measures to further advance its performance. An alternate application of Cs2AgBiBr6 in photocatalysis, which takes advantage of its less toxicity and better stability, is also discussed.

Structural, electronic, optical, elastic, thermodynamic and thermal transport properties of Cs2AgInCl6 and Cs2AgSbCl6 double perovskite semiconductors using a first-principles study

“…The inherent constraints have significantly limited their practical applications. [39][40][41][42] The interesting matters of stability have attracted greater attention and have been partially overcome through the substitution of the organic cation with inorganic cesium ions. This development has inspired the scientific community to begin a search for metal halide perovskite compounds that possess similar photoelectric characteristics while simultaneously exhibiting non-toxicity and steadfastness.…”

Gas‐Quenching Approach for Fabricating Cs2AgBiBr6 Thin Films in Ambient Environment for Lead‐Free All‐Inorganic Perovskite Solar Cells with Carbon Electrodes

“…[9] Cs 2 AgBiBr 6 has gathered considerable attention among double perovskites due to its high ambient stability and nontoxicity. [10][11][12] However, the PCE of the Cs 2 AgBiBr 6 -based PSCs has lagged behind traditional organicinorganic Pb-based PSCs. Studies to date have shown that the performance limiting factor of these cells is the large indirect bandgap of Cs 2 AgBiBr 6 (1.9-2.2 eV), using unsuitable charge transporting layers, strong electron-phonon coupling, and poor film quality.…”

Simulation Design of Novel Non-Fluorine Polymers as Electron Transport Layer for Lead-Free Perovskite Solar Cells

“…A highly stable double perovskite class of a Cs 2 AgBiBr 6 absorber layer has recently been reported as a viable substitute for Pb-based perovskite. As a result, Cs 2 AgBi 0.75 Sb 0.25 Br 6 is favored for this study due to its various benefits, including being lead-free, non-toxic, extremely stable, and compatible with a variety of transport layers, as reported in the literature [10][11][12].…”