Abstract
AbstractFerroelectric semiconductors represent an exciting branch of new‐generation optoelectronic devices. However, regarding severe polarization deterioration caused by leakage current, it is challenging to couple ferroelectricity and semiconductive properties in a single‐phase material. The first quadrilayered ferroelectric semiconductor of 2D homologous perovskites, IA2Cs3Pb4Br13 (IA = isoamylammonium), showing distinctive ferroelectric characteristics of symmetry breaking at 351 K and large polarization of 4.2 µC cm‐2 is presented here. The design strategy of increasing layer‐number endows higher Curie temperature and superior semiconductor merits than other lower‐layered members (IA2Csn‐1PbnBr3n+1, n = 1–3). Bulk photovoltaic effects in IA2Cs3Pb4Br13 result in a notable dichroism up to ≈1.2 for self‐driven polarized‐light detection. This unprecedented study opens an avenue toward the targeted performance optimization of electric‐ordered functional materials.
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