期刊
ACS NANO
卷 12, 期 5, 页码 4919-4929出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b01999
关键词
quasi-two-dimensional halide perovskite; water-air interface; fast growth; single crystal membrane; photodetector
类别
资金
- Institute of Critical Technology and Applied Science (ICTAS)
- Air Force Office of Scientific Research
- SBIR program (Nanosonic)
- NSF I/UCRC: Center for Energy Harvesting Materials and Systems (CEHMS)
The robust material stability of the quasi-two-dimensional (quasi-2D) metal halide perovskites has opened the possibility for their usage instead of three-dimensional (3D) perovskites. Further, devices based on large area single crystal membranes have shown increasing promise for photoelectronic applications. However, growing inch-scale quasi-2D perovskite single crystal membranes (quasi-2D PSCMs) has been fundamentally challenging. Here we report a fast synthetic method for synthesizing inch-scale quasi-2D PSCMs, namely (C4H9NH3)(n)(CH3NH3)(n-1)PbnI3n+1 (index n = 1, 2, 3, 4, and infinity), and demonstrate their application in a single-crystal photodetector. A quasi-2D PSCM has been grown at the water-air interface where spontaneous alignment of alkylammonium cations and high chemical potentials enable uniform orientation and fast in-plane growth. Structural, optical, and electrical characterizations have been conducted as a function of quantum well thickness, which is determined by the index n. It is shown that the photodetector based on the quasi-2D PSCM with the smallest quantum well thickness (n = 1) exhibits a strikingly low dark current of similar to 10(-13) A, higher on/off ratio of similar to 10(4), and faster response time in comparison to those of photodetectors based on quasi-2D PSCMs with larger quantum well thickness (n > 1). Our study paves the way toward the merging the gap between single crystal devices and the emerging quasi-2D perovskite materials.
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