02001nas a2200193   4500008004100000022001400041245009000055210006900145260008700214300001100301490000800312520125100320100002001571700002201591700002401613700002101637700002601658856012301684       2014                        eng d  a0003-695100aNegative infrared photocurrent response in layered WS2/reduced graphene oxide hybrids0 aNegative infrared photocurrent response in layered WS2reduced gr  a1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USAbAMER INST PHYSICScDEC  a2435020 v1053 a<p>We report high performance IR photocurrent response of two-dimensional hybrid materials consisting of layered WS2 nanosheets and reduced graphene oxide (RGO). Comparative photocurrent response studies of WS2 nanosheets, RGO, and WS2/RGO hybrids were carried out by performing current-voltage (I-V) and time-dependent current measurements with a laser excitation source having a wavelength of 808 nm. The experimental investigations indicate that WS2/RGO hybrids show negative photocurrent response, whereas WS2 and RGO show positive photocurrent response. The negative photocurrent response of the WS2/RGO hybrids is explained using a band alignment diagram and attributed to a charge transfer mechanism between WS2 and RGO. This analysis is further corroborated by first-principles density functional calculations. The fabricated device based on WS2/RGO hybrids shows a photosensitivity R-lambda of about 6 AW(-1) and a quantum efficiency eta of similar to 924%, which demonstrates high sensitivity of the hybrid material towards IR detection. WS2/RGO hybrids are therefore promising candidates for potential applications in optoelectronic circuits and low cost, high performance, and reliable photodetectors. (C) 2014 AIP Publishing LLC.</p>1 aRatha, Satyajit1 aSimbeck, Adam, J.1 aLate, Dattatray, J.1 aNayak, Saroj, K.1 aRout, Chandra, Sekhar  uhttps://library.ncl.res.in/content/negative-infrared-photocurrent-response-layered-ws2reduced-graphene-oxide-hybrids-0