02445nas a2200217   4500008004100000022001400041245009300055210006900148260011000217300001400327490000600341520159700347100002801944700002001972700002401992700001802016700002302034700002402057700002102081856012502102       2016                        eng d  a2050-752600aLow frequency noise and photo-enhanced field emission from ultrathin PbBi2Se4 nanosheets0 aLow frequency noise and photoenhanced field emission from ultrat  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcDEC  a1096-11030 v43 a<p>Atomically thin two-dimensional layered materials have gained wide interest owing to their novel properties and potential for applications in nanoelectronic and optoelectronic devices. Here, we present the spectral analysis and photo-enhanced field emission studies of a layered intergrowth PbBi2Se4 nanosheet emitter, performed at the base pressure of similar to 1 x 10(-8) mbar. The emitter shows a turn-on field value of similar to 4.80 V mu m(-1), corresponding to an emission current density of similar to 1 mu A cm(-2). Interestingly, when the cathode was illuminated with visible light, it exhibited a lower turn-on field of B3.90 V mm(-1), and a maximum emission current density of similar to 893 mu A cm(-2) has been drawn at an applied electric field of similar to 8.40 V mu m(-1). Furthermore, the photo-enhanced emission current showed reproducible, step-like switching behavior in synchronous with ON-OFF switching of the illumination source. The emission current-time plots reveal excellent stability over a duration of similar to 6 h. Low-frequency noise is a significant limitation for the performance of nanoscale electronic devices. The spectral analysis performed on a Fast Fourier Transform (FFT) analyzer revealed that the observed noise is of 1/f(alpha) type, with the value of alpha similar to 0.99. The low frequency noise, photo-enhanced field emission, and reproducible switching behavior characterized with very fast rise and fall times propose the layered PbBi2Se4 nanosheet emitter as a new promising candidate for novel vacuum nano-optoelectronic devices.</p>1 aSuryawanshi, Sachin, R.1 aGuin, Satya, N.1 aChatterjee, Arindom1 aKashid, Vikas1 aMore, Mahendra, A.1 aLate, Dattatray, J.1 aBiswas, Kanishka  uhttps://library.ncl.res.in/content/low-frequency-noise-and-photo-enhanced-field-emission-ultrathin-pbbi2se4-nanosheets-0