Ferro-pyro-phototronic effect enhanced self-powered, flexible and ultra-stable photodetectors based on highly crystalized 1D/3D ferroelectric perovskite film

Self-powered and flexible perovskite photodetectors are holding great promise owing to their potential for high-performance wearable and portable optoelectronic applications. The light-induced ferro-pyro-phototronic effect can boost the performances of ferroelectric materials-based photodetector systems significantly. However, the utilization of the ferro-pyro-phototronic effect in polycrystalline halide perovskites films-based flexible photodetectors is rarely mentioned. Here, a ferro-pyro-phototronic effect boosted self-powered, flexible, and ultra-stable photodetector based on 1D/3D mixed perovskite ferroelectric film/P3HT heterojunction is demonstrated. By employing Pb(SCN)₂ as lead source to partially for fabricating high-quality MAPbI₃ film and incorporating 1D ferroelectric perovskite TMIMPbI₃, the overall optoelectronic performances were largely enhanced, with a low dark current of 7 × 10⁻⁹ A, a responsivity of 6.6 mA/W and a detectivity of 5 × 10⁹ Jones. The PDs displayed good folding endurance, and anti-humidity stability. The excellent performance is attributed to the reduced trap-density and enhanced pyro-phototronic effect induced by improved crystallinity and introduced ferroelectricity.