Abstract
Methylammonium lead triiodide perovskite (CH3NH3PbI3, MAPbI3) has been emerging as an easy processing and benign defect material for optoelectronic devices. Fiber-like perovskite materials are especially in demand for flexible applications. Here we report on a kind of polyacrylonitrile (PAN)/MAPbI3 composite fiber, which was electrospun from the mixing solution of PAN and MAPbI3. The absorption edge and optical gap of the PAN/MAPbI3 composite fibers can be easily tuned as the ratio of the perovskite changes. Both the moisture stability and the thermal stability of the perovskite are improved with the protection of PAN polymers. Flexible photodetectors based on this perovskite fiber were fabricated and analyzed. The photoresponse of the detector was highly sensitive to broadband visible light, and reached 6.5 μA W−1 at 700 nm with a voltage bias of 10 V. Compared with pure MAPbI3 photodetectors, this composite fiber photodetector has much-improved stability and flexibility, which can even be used to detect motion-related angular changes.
Highlights
As a new photovoltaic material, methylammonium lead triiodide perovskite (CH3 NH3 PbI3, denoted as MAPbI3 ) has a low bandgap, a large absorption coefficient, a high carrier mobility, a long carrier diffusion length, and a low-cost synthetic route [1,2,3,4,5,6]
Our work explores a new way towards synthesis of various perovskite/polymer composite materials well-suited for optoelectronic devices with much
All these results demonstrate that PAN/MAPbI3 composite fibers be used inwhich fast have been reported to be unstable the majority of ordinaryCompared solvents and air MAPbI
Summary
As a new photovoltaic material, methylammonium lead triiodide perovskite (CH3 NH3 PbI3 , denoted as MAPbI3 ) has a low bandgap, a large absorption coefficient, a high carrier mobility, a long carrier diffusion length, and a low-cost synthetic route [1,2,3,4,5,6]. These photoelectric devices, based on organolead halide thin films, are mostly cast from nanocrystals or micro-size grains [7,8,9,10]. It was urgent to develop a facile method to prepare MAPbI3 fibers with excellent optical trapping and good stability
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