期刊
ADVANCED ELECTRONIC MATERIALS
卷 5, 期 12, 页码 -出版社
WILEY
DOI: 10.1002/aelm.201900786
关键词
lateral photovoltaic effect; position sensitive detector; pyro-phototronic effect; TI heterostructures
资金
- National Nature Science Foundation of China [11704094, 11504076, 51372064, 61405040, 51622205, 61675027, 51432005, 61505010]
- Nature Science Foundation of Hebei Province [F2019201047, E2017201227, F2017201141, F2018201198]
- Science and Technology Research Project of Hebei Province Higher Education Institution [ZD2016036]
- Nature Science Foundation for Distinguished Young Scholars of Hebei University [2015JQ03]
- Young Talents of Hebei Province
- Minister of Science and Technology [2016YFA0202703]
Bi2Te(/Se)(3), as a novel topological insulator, is a prospective candidate for next-generation spintronic and photoelectric devices. Here, A series of Bi2Te2.7Se0.3 films are successfully prepared on Si substrate with different thicknesses and used as a self-powered light position sensitive detector (PSD) through the introduction of a lateral photovoltaic effect (LPE). Owing to its wide and strong absorption, the high surface mobility of the Bi2Te2.7Se0.3 layer, and the outstanding heterojunction quality, this PSD shows an unprecedentedly broadband photoresponse from approximate to 350 to approximate to 2200 nm and exhibits very good performance with ultralarge sensitivities (283.71 mV mm(-1) at 532 nm, 137.4 mV mm(-1) at 1064 nm, 38.91 mV mm(-1) at 1550 nm, and 16.56 mV mm(-1) at 2200 nm), perfect nonlinearity (<3%), and ultrafast response times (approximate to 52.1 mu s/approximate to 70.2 mu s), all of which are among or represent the best results reported until now, especially in the infrared region. Additionally, its sensitivity can also be greatly improved though the addition of a bias voltage with an increment up to 194.6% at -1 V. More importantly, the pyro-phototronic effect, which can be used to modulate both the LPE and the time response, is surprisingly observed in this PSD but with different working mechanisms than found in traditional photodetectors.
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