Journal
NANO LETTERS
Volume 20, Issue 10, Pages 7144-7151Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02468
Keywords
Flexible photodetector; single-crystalline perovskite; ultrathin film; hybrid organic-inorganic perovskite
Categories
Funding
- National Key R&D Program of China [2018YFA0704401]
- National Natural Science Foundation of China [91950115, 11774014, 61521004]
- Beijing Natural Science Foundation [Z180011]
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Flexible optoelectronic devices attract considerable attention due to their prominent role in creating novel wearable apparatus for bionics, robotics, health care, and so forth. Although bulk single-crystalline perovskite-based materials are well-recognized for the high photoelectric conversion efficiency than the polycrystalline ones, their stiff and brittle nature unfortunately prohibits their application for flexible devices. Here, we introduce ultrathin single-crystalline perovskite film as the active layer and demonstrate a high-performance flexible photodetector with prevailing bending reliability. With a muchreduced thickness of 20 nm, the photodetector made of this ultrathin film can achieve a significantly increased responsivity as 5600A/W, 2 orders of magnitude higher than that of recently reported flexible perovskite photodetectors. The demonstrated 0.2 MHz 3 dB bandwidth further paves the way for high-speed photodetection. Notably, all its optoelectronic characteristics resume after being bent over thousands of times. These results manifest the great potential of single-crystalline perovskite ultrathin films for developing wearable and flexible optoelectronic devices.
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