Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201906335
Keywords
carbon nanotubes; lead-free perovskites; light-stimulated synaptic devices; photodetectors; transistors
Categories
Funding
- National Natural Science Foundation of China [61822405]
- Science and Technology Foundation of Shanghai [17JC1404600]
- Shanghai Education Development Foundation
- Shanghai Municipal Education Commission [18SG20]
- Fundamental Research Funds for the Central Universities
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Lead-free perovskite materials are exhibiting bright application prospects in photodetectors (PDs) owing to their low toxicity compared with traditional lead perovskites. Unfortunately, their photoelectric performance is constrained by the relatively low charge conductivity and poor stability. In this work, photoresponsive transistors based on stable lead-free bismuth perovskites CsBi3I10 and single-walled carbon nanotubes (SWCNTs) are first reported. The SWCNTs significantly strengthen the dissociation and transportation of the photogenerated charge carriers, which lead to dramatically improved photoresponsivity, while a decent I-light/I-dark ratio over 10(2) can be maintained with gate modulation. The devices exhibit high photoresponsivity (6.0 x 10(4) A W-1), photodetectivity (2.46 x 10(14) jones), and external quantum efficiency (1.66 x 10(5)%), which are among the best reported results in lead-free perovskite PDs. Furthermore, the excellent stability over many other lead-free perovskite PDs is demonstrated over 500 h of testing. More interestingly, the device also shows the application potential as a light-stimulated synapse and its synaptic behaviors are demonstrated. In summary, the lead-free bismuth perovskite-based hybrid phototransistors with multifunctional performance of photodetection and light-stimulated synapse are first demonstrated in this work.
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