03292nas a2200145 4500008004100000245008300041210006900124260000800193490000600201520276400207100002002971700001702991700002403008856011403032 2017 eng d00aHigh-Performance Sensing Behavior Using Electronic Ink of 2D SnSe2 Nanosheets.0 aHighPerformance Sensing Behavior Using Electronic Ink of 2D SnSe cMAY0 v23 a

Most of the recent research work on layered chalcogenides is understandably focused on single atomic layers. However, it is uncertain if the single layer units are most ideal structures for enhanced gas-solid interactions. To probe this concern, we have synthesized few layer thick SnSe2 nanosheets ink using liquid exfoliation method. The morphology, thickness / layering and elemental analysis of the sheets were characterized by using SEM, TEM, AFM, Raman spectroscopy and by XPS. The two dimensional (2D) SnSe2 nanosheets sensor device with different thicknesses was assessed for the humidity and gas sensing performances with exposure to humidity in different conditions. The results show that compared to the bulk / thicker counterpart, sensor device of few SnSe2 layers exhibit excellent sensitivity, recovery and ability to be tune the sensing performance with thickness and can be used in lab on chip devices.

1 aPawar, Mahendra1 aKadam, Sunil1 aLate, Dattatray, J. uhttps://library.ncl.res.in/content/high-performance-sensing-behavior-using-electronic-ink-2d-snse2-nanosheets02444nas a2200265 4500008004100000022001400041245016500055210006900220260000900289300001600298490000600314520147000320653001501790653002401805653002501829653002801854653002301882653002701905100002301932700001901955700002001974700002601994700002702020856013102047 2022 eng d a2574-096200aDual-functional 3-acetyl-2,5-dimethylthiophene additive-assisted crystallization control and trap state passivation for high- performance perovskite solar cells0 aDualfunctional 3acetyl25dimethylthiophene additiveassisted cryst cDEC  a14701-147110 v53 a

Defect-mediated charge recombination and successive degradation mainly lag the performance of perovskite solar cells (PSCs). Insufficiency or evaporation of organic cations leaves behind the undercoordinated Pb2+ ions, which act as severe charge recombination centers. Herein, theoretical and experimental insights into crystallization control and defect passivation of MAPbI3 perovskite by the dual-functional 3-acetyl-2,5-dimethylthiophene (ADT) molecule are pre-sented. Density functional theory calculations show that both functional groups of ADT possessing different interaction energies could interact with PbI2. The carbonyl group in ADT shows the dominant interaction with Pb2+ forming an intermediate product that might decrease the crystallization rate. Further, the coordinate bonding between ADT and uncoordinated Pb2+ ions in perovskite leads to defect passivation. The 0.6% ADT-modified PSCs possess an average power conversion efficiency (PCE) of 18.22 +/- 0.80% and the highest PCE of 19.03%, whereas the pristine PSCs exhibit an average PCE of 16.23 +/- 1.32% and the highest PCE of 17.47%. Furthermore, the modified PSCs maintain 80% of the initial PCE up to 650 h during storage at ambient conditions (RH = 35 +/- 5%). The present study shows that the simultaneous crystalization control and defect passivation achieved via an ADT additive engineering approach could be an efficient strategy to enhance the PCE and stability of PSCs.

10a3-acetyl-210a5-dimethylthiophene10aadditive engineering10acrystallization control10adefect passivation10aPerovskite solar cells1 aSaykar, Nilesh, G.1 aIqbal, Muzahir1 aPawar, Mahendra1 aChavan, Kashinath, T.1 aMahapatra, Santosh, K. uhttps://library.ncl.res.in/content/dual-functional-3-acetyl-25-dimethylthiophene-additive-assisted-crystallization-control-and02598nas a2200337 4500008004100000245008900041210006900130260000800199300001000207490000600217520154200223653002201765653001901787653001501806653001501821653000901836100002201845700002301867700002301890700002001913700001901933700002001952700002301972700002001995700001802015700002302033700003102056700003002087700002402117856011902141 2023 eng d00aTitanium trisulfide nanosheets and nanoribbons for field emission- based nanodevices0 aTitanium trisulfide nanosheets and nanoribbons for field emissio cJAN a44-490 v63 a

The field emission (FE) properties of TiS3 nanosheets and nanoribbons, synthesized by direct sulfuration of bulk titanium, are investigated. The nanosheets show an enhanced FE behavior with a low turn-on field of similar to 0.3 V/ mu m, required for drawing an emission current density of similar to 10 mu A/cm2. Interestingly, the TiS3 nanosheet emitter delivered a large emission current density of similar to 0.9 mA/ cm2 at a relatively low applied electric field of similar to 0.4 V/mu m. We have estimated the values of the field enhancement factor (beta), which are found to be similar to 5 x 104 for the TiS3 nanosheet emitter and similar to 4 x 103 for the nanoribbon emitter. We attribute the superior FE performance to the presence of atomically sharp edges and the reduced thickness of TiS3, as reflected in the high value of beta. In fact, the nanosheet sample presents a higher density of ultrathin layers (similar to 12 nm-thick), and thus, they have a larger edge to volume ratio than the nanoribbon samples (which are similar to 19 nm-thick). The superior FE behavior of TiS3 nanosheets over nanoribbons makes them a propitious field emitter and can be utilized for various FE-based applications, demanding large emission currents and lower operational voltages. Moreover, the FE current stability recorded on these samples confirms their promising performance. Thus, the present investigation brings out a great promise of TiS3 nanosheets and nanoribbons as field emitters for vacuum nanoelectronics devices.

10aCurrent stability10afield emission10ananoribbon10ananosheets10aTiS31 aPawbake, Amit, S.1 aKhare, Ruchita, T.1 aIsland, Joshua, O.1 aFlores, Eduardo1 aAres, Jose, R.1 aSanchez, Carlos1 aFerrer, Isabel, J.1 aPawar, Mahendra1 aFrank, Otakar1 aMore, Mahendra, A.1 avan der Zant, Herre, S. J.1 aCastellanos-Gomez, Andres1 aLate, Dattatray, J. uhttps://library.ncl.res.in/content/titanium-trisulfide-nanosheets-and-nanoribbons-field-emission-based-nanodevices