Journal
ACS PHOTONICS
Volume 5, Issue 6, Pages 2113-2119Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b01567
Keywords
all-inorganic perovskites; weak-light detectors; polycrystalline single microwire; Schottky barrier; dark current
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Funding
- National High Technology Research and Development Program [2015AA050601]
- National Natural Science Foundation of China [11674245, 61376013, 91433203]
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In recent years, hybrid organic-inorganic perovskites have emerged as promising photosensing materials for next-generation solution-processed photo detectors, achieving high responsivity, fast speed, and large linear dynamic range. In particular, perovskite photoresistors possess low-cost fabrication and easy integration with low dimensional structures. However, a relatively large dark current is still limiting the further development of perovskite photoresistors. Herein, we introduce full-inorganic perovskite polycrystalline microwires for high-performance photo detection, in order to enhance the device stability. Furthermore, dark current and noise can be effectively suppressed by tuning the contacts. All-inorganic CsPbBr3 microwires with a number of nanocrystals on the wire surface are prepared by a simple, low-cost, two-step, solution-processed method at room temperature. Photodetectors based on this CsPbBr3 polycrystalline single microwire are assembled on indium tin oxide electrodes and demonstrate a decent responsivity up to 118 A/W and a fast response within 40 ms. In addition, such optimized photoresistors possess a fairly tiny dark current and noise, which result in an improved detectivity of > 10(12) Jones and demonstrate excellent characteristics to detect weak light.
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