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Phase transition kinetics and surface binding states of methylammonium lead iodide perovskite
Rajendra Kumar, G.,Dennyson Savariraj, A.,Karthick, S. N.,Selvam, S.,Balamuralitharan, B.,Kim, Hee-Je,Viswanathan, K. K.,Vijaykumar, M.,Prabakar, Kandasamy The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.10
<P>We have presented a detailed analysis of the phase transition kinetics and binding energy states of solution processed methylammonium lead iodide (MAPbI(3)) thin films prepared at ambient conditions and annealed at different elevated temperatures. It is the processing temperature and environmental conditions that predominantly control the crystal structure and surface morphology of MAPbI3 thin films. The structural transformation from tetragonal to cubic occurs at 60 degrees C with a 30 minute annealing time while the 10 minute annealed films posses a tetragonal crystal structure. The transformed phase is greatly intact even at the higher annealing temperature of 150 degrees C and after a time of 2 hours. The charge transfer interaction between the Pb 4f and I 3d oxidation states is quantified using XPS.</P>
Selvam, S.,Balamuralitharan, B.,Karthick, S. N.,Savariraj, A. Dennyson,Hemalatha, K. V.,Kim, Soo-Kyoung,Kim, Hee-Je The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.19
<▼1><P>A novel sulfated β-cyclodextrin/PVP/MnCO3 composite has been synthesized for a parallel-connected supercapacitor and dye-sensitized solar cell (counter electrode).</P></▼1><▼2><P>A novel sulfated β-cyclodextrin/PVP/MnCO3 composite has been synthesized for a parallel-connected supercapacitor and dye-sensitized solar cell (counter electrode). β-Cyclodextrin has sulfonated, thermally cross-linked with PVP, and incorporated with MnCO3 nanoparticles. The composite electrode exhibited 202.6 F g<SUP>−1</SUP> capacitance, 197.96 W h kg<SUP>−1</SUP> energy density, 5.57% <I>η</I> (DSSC) and 70% performance up to 200 °C with a [BMI][TFSI] electrolyte.</P></▼2>
Kim, Hee‐,Je,Yeo, Tae‐,Bin,Kim, Soo‐,Kyoung,Rao, S. Srinivasa,Savariraj, A. Dennyson,Prabakar, K.,Gopi, Chandu V. V. M. WILEY‐VCH Verlag 2014 European journal of inorganic chemistry Vol.2014 No.26
<P><B>Abstract</B></P><P>Metal sulfide electrodes were compared to a conventional platinum (Pt) counter electrode (CE) in quantum‐dot‐sensitized solar cells (QDSSCs), in which they were used to improve the short circuit current, fill factor, and conversion efficiency (<I>η</I>). We deposited optimal‐temperature‐based nickel sulfide (NiS) thin films on a fluorine‐doped tin oxide (FTO) substrate by a facile chemical bath deposition method and successfully employed them as a highly efficient CE for QDSSCs. The obtained NiS thin‐film nanoparticles exhibit high electrocatalytic performance and fast mass transfer rates toward the polysulfide electrolyte. Under the illumination of one sun (100 mW cm<SUP>–2</SUP>), the QDSSC with a NiS CE produces a higher <I>η</I> of 3.30 %, which is much higher than that of a Pt CE (1.89 %). Cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel polarization measurements were performed to investigate the electrocatalytic activity of the NiS CE toward polysulfide electrolyte.</P>