Publication date: 21st July 2025
Chiral two-dimensional (2D) perovskites, derived from hybrid organic-inorganic halide perovskites (HOIPs), offer key advantages for optoelectronics, including defect tolerance, strong light absorption, compositional tunability, and low-cost synthesis. Their 2D structure leads to strong quantum confinement, evident in blue-shifted absorption/emission and elevated exciton binding energy, resulting in excitonic optical and photoluminescence behavior even at room temperature. Incorporating chiral cations distorts the inorganic framework, enabling circular dichroism, circularly polarized photoluminescence, and chiral-induced spin selectivity. These properties are of high interest for optoelectronic and spintronic technologies, including circularly polarized light sources [1], detectors [2], and spin-polarized current control [3]. Since such applications rely on thin films, understanding the impact of grain size on performance is essential.
In this study, we examined the optical properties—absorption, PL, and CD—of (R-3BrPEA)₂PbI₄ thin films based on (1R)-1-(3-bromophenyl)ethanamine [1]. Hypophosphorous acid (HPA) was used as a precursor additive to modulate surface roughness [4], a method previously shown to enhance grain size in MAPbI₃ by adjusting pH, polarity, and surface tension. We demonstrate that varying HPA concentration allows control over surface roughness, film density, and crystalline strain. The results reveal strain as a key determinant of photoluminescence yield, highlighting this approach’s potential for optoelectronic applications.
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