Polyhydroxy Ester Stabilized Perovskite for Low Noise and Large Linear Dynamic Range of Self-Powered Photodetectors

Solution-processed perovskites as emerging semi-conductors have achieved unprecedented milestones in sensor optoelectric devices. Stability along with the device noise issues are the major obstacle for photodetectors to compete with the traditional devices. Here, we demonstrated that L-ascorbic acid (L-AA) as a polyhydroxy ester can coordinate with the amino group of formamidine cations (FA(+)) through multiple hydrogen bond interactions to stabilize the perovskite, which protect the FA(+) ions from nucleophile attack and effectively suppress the degradation of FA(+) ions, improving the perovskite stability and suppressing the device noise to below 0.3 pA Hz(-1/2) with a large linear dynamic range of 239 dB. The dual functions of L-AA enable the perovskite photodetector to have a high detectivity of 10(12) Jones. The self-powered device works with no energy consumption and maintains an undegraded performance over 1200 h of inspection at ambient conditions, which is promising for infrastructure construction, signal sensing, and real-time information delivery.

Automated summary

Solution-processed perovskites have achieved significant advancements in sensor optoelectric devices, with L-ascorbic acid shown to stabilize the perovskite and suppress device noise effectively. The dual functions of L-AA enable high detectivity and a large linear dynamic range for the perovskite photodetector, making it promising for various applications like infrastructure construction and real-time information delivery.