CHEM01200604009 Sreejith Kaniyankandy - Homi Bhabha ...

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189 However the position of bands in a buried interface requires more advanced instrumentation like ultraviolet photoelectron spectroscopy. Our study on charge separation in CdTe decorated graphene has shown how a heterostructure with good electronic contact can be used for an effcicient charge separation. The studies actually show the dynamics to be multiexponential which indicates that several factors contribute to relaxation. Further studies to explore role of different processes involved in the relaxation is required. Possible areas of explorateation are necessary to better understand charge carrier dynamics in QD based nanostructures. The possible direction of investigations as delineated in outlook section are fundamental in nature, but it has a large bearing on applications that these heterostructure are intended to be used for.
190 Chapter 8 List of Publications 1. Efficient Charge Separation in CdTe Quantum Dot decorated Graphene. Sreejith Kaniyankandy, Sachin Rawalekar, and Hirendra N. Ghosh, Journal of Physical Chemistry C, 116, 16271–16275 (2011) 2. Ultrafast Relaxation Dynamics in Graphene Oxide: Evidence of Electron Trapping, Sreejith Kaniyankandy, S. N. Achary, Sachin Rawalekar, and Hirendra N. Ghosh, Journal of Physical Chemistry C, 115, 19110–19116 (2011) 3. Ultrafast Hole Transfer in CdSe/ZnTe Type II Core-Shell Nanostructure, Kaniyankandy, S., Rawalekar, S.,Verma, S., Ghosh, H. N., Journal of Physical Chemistry C,115, 1428-1435 (2011) 4. Charge Carrier Dynamics in Thiol Capped CdTe Quantum Dots, Kaniyankandy, S., Rawalekar, S.,Verma, S., Palit, D. K. Physical Chemistry Chemical Physics 12, 4210-4216 (2010) 5. Efficient Luminescence and Photocatalytic Behavior in Ultrafine TiO 2 Particles Synthesized by Arrested Precipitation, Kaniyankandy, S., Ghosh, H. N. Journal of Materials Chemistry, 19, 3523-3528 (2009) 6. Evidence of Multiple Electron Injection and Slow Back Electron Transfer in Alizarin-Sensitized Ultrasmall TiO 2 Particles, Kaniyankandy, S., Verma, S., Mondal, J. A., Palit, D. K., Ghosh, H. N. Journal of Physical Chemistry C 113, 3593-3599 (2009)
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Charge Transfer Dynamics in Quantum
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DECLARATION I, hereby declare that
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ACKNOWLEDGEMENTS It is my privilege
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1.3.5. Defect Mediated Relaxation 2
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2. 8. 4. White Light Generation- 45
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6.2. Experimental 6.2.1.Synthesis o
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devices based on QDs it has been sh
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Furthermore generation of pump (~40
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shell). This clearly indicated that
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12. V. I. Klimov, J. Phys. Chem. B,
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1.13 Reactant and Product Potential
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light. Inset: Kinetic traces monito
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6.5 Transient decay kinetics of gra
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at 670 nm after exciting at 400 nm
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ABBREVIATIONS BET BQ CB CCD CdS CdT
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1 Chapter 1
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3 size dependent optical properties
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5 1.2. Physics of Semiconductors 1.
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7 As seen from the schematic, poten
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9 Substituting this in Schrödinger
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11 ( r, r ) ( r ) ( r ) (1.13) e
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13 E E E 2 2 2 EX ne, le nh,
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15 spherical symmetry of field. The
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17 gE ( ) 2Em 2 3 3 (1.25) For a
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19 1.3.2. Electron-Hole energy tran
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21 Impact Ionization Figure 1.7. Sc
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23 understanding on mechanistic asp
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25 carriers are unable to sample th
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27 CB VB QD Metal Figure. 1. 10. Sc
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29 energy barrier. Therefore it is
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31 1 f q 2 A qB (1.30) 2 In equa
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33 Vibrational contribution can be
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35 1. 7. 1. Electron Injection ET i
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37 Under assumption of invariance o
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39 distribution. To achieve good si
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41 initially achieved monodispersit
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43 and rate of charge transfer acro
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45 1.32 P. V. Kamat, J. Phys. Chem.
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47 Chapter 2
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49 chemical species. Since a partic
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51 fluorescence forms an important
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53 eliminated by use of standard wh
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55 sample. Raman spectroscopy is ba
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57 will appear bright and region wi
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59 volatile solvent is drop casted
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61 spots arise from diffraction fro
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63 The electrical signal is then ch
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65 delayed and inverted. The two si
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67 Pump-probe technique is one of t
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69 Amplifier Jade Stretcher fs Osci
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71 Figure 2.6. Optical layout of Ti
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73 Grating Convex Mirror Concave Mi
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75 changes the polarization from ho
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77 Grating Output Input Mirror Grat
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79 μJ has a very high peak power.
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81 2.6. Dynamical Theory of X-Ray D
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83 Chapter 3
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85 Therefore the study of interfaci
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87 3. 2. Experimental Section 3.2.1
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89 and intensity show absence of ot
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91 which is also neutral; therefore
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93 electron transfer times. This re
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95 r B a * 0 3.1 me / me Now the
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97 nonadiabatic case the electron t
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99 drastically reduced leading to a
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101 While the study of injection dy
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103 study. Based on the injection d
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105 17. L. E. Brus, J. Phys. Chem.
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107 Chapter 4
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109 of the QDs. As a result surface
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111 4.2.2. Synthesis: The CdTe QDs
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113 lower hole state. In CdSe the l
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115 4.2 inset. The kinetic traces a
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117 growth of the bleach kinetics (
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119 previous section we have discus
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121 lived charge transfer complex w
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123 100 times concentration of the
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125 4.5. References 4.1. Efros, Al.
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127 Chapter 5
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129 been made in the synthesis of t
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131 metallic synthesis by arrested
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133 5.3. Result and discussion: 5.3
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135 indicating a confinement induce
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137 absorption studies that on form
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139 1000 c b PL Intensity 100 10 a
Page 188 and 189: 141 samples due to a very weak exci
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Page 192 and 193: 145 Earlier authors [5.4] reported
Page 194 and 195: 147 Sample t r(ps) t 1(ps) t 2(ps)
Page 196 and 197: 149 In addition to the cooling dyna
Page 198 and 199: 151 pulse-width time scale followed
Page 200 and 201: 153 5.20. Sreejith Kaniyankandy, Sa
Page 203 and 204: 155 CHAPTER 6 Charge Separation in
Page 205 and 206: 157 Studies by Wang et. al. [6.15]
Page 207 and 208: 159 graphene in a 1M NaOH solution.
Page 209 and 210: 161 Intensity (a.u.) 5 4 3 2 1 CdTe
Page 211 and 212: 163 dynamics of graphene oxide and
Page 213 and 214: 165 GO as shown in the Figure 3 rev
Page 215 and 216: 167 electron acceptor for Graphene.
Page 217 and 218: 169 governs the recombination dynam
Page 219 and 220: 171 Sample τ 1 (ps) τ 2 (ps) τ 3
Page 221 and 222: 173 A (mO.D) 10.0 0.0 -10.0 -20.0 0
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Page 225 and 226: 177 Electron quencher (benzoquinone
Page 227 and 228: 179 Scheme 6.1. Schematic of Electr
Page 229 and 230: 181 6.6. Reina, A.; Jia, X.; Ho, J.
Page 231: 183 6.26. Kaiser, A. B.; Navarro, C
Page 234 and 235: 185 assigned to injection into diff
Page 236 and 237: 187 transfer from CdSe core to ZnTe
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