Abstract
AbstractAll‐inorganic perovskite cesium lead triiodide (CsPbI3) has attracted much attention among the perovskite family due to its excellent optoelectronic properties and chemical stability. However, the high‐temperature crystallization process makes CsPbI3 less compatible with commercially flexible substrates, limiting its application into flexible optoelectronics. Here, a cation of 1‐(3‐aminopropyl)‐2pyrrolidinone (APP) is reported that can form 1D (APP)PbI3 perovskite as templates, and significantly reduce the CsPbI3 black‐phase transition energy with a low annealing temperature of 75 °C, which further enables a flexible (APP)PbI3/γ‐CsPbI3 (1D/3D) heterostructure photodetector on ITO/PET substrate. A high external quantum efficiency (EQE) greater than 2377% is observed along the orientated 1D/3D heterostructure. The high gain and low noise result in a high specific detectivity (D*) over 1012 Jones under −0.6 V low bias. The optimized device structure brings a high EQE × bandwidth product of 119 kHz under a low driving bias. Due to the high toughness of orientated APP+ ions and the face‐connected [PbI3]− chains structure as a strong energy absorber, the flexible photodetector also shows excellent phase stability and impressive flexibility, remaining >90% initial responsivity after over 20 000 times bending with potential flexible imaging application in harsh environments.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
