CHEM01200604009 Sreejith Kaniyankandy - Homi Bhabha ...

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light. Inset: Kinetic traces monitored at 530nm (Figure 3 a) and at 610nm (Figure 3 b) and optical absorption spectra for the sample. 4.3 Normalized kinetic traces photoexcited CdTe for different 118 particle sizes at 610 nm (1S exciton position). Panel B: Plot of cooling time (growth kinetics at 1S exciton) vs particle size showing non-linear increment. 4.4 Normalized kinetic traces of a) CdTe, b) CdTe with BQ 119 and c) CdTe with BA at 610 nm (1S exciton position). Inset: Same kinetic traces at shorter time scale. 5.1 High-resolution TEM (HR-TEM) image of CdSe/ZnTe 133 quantum dot core-shell (Panel A) and same picture in higher resolution Panel B). Insets: Selected electron diffraction patternof the corresponding particles. 5.2 XRD Pattern for CdSe/ZnTe quantum dot core-shell 134 5.3 Steady state absorption spectra of a) CdSe (thick solid 135 line), b) CdSe/ZnTe1 (short dash), c) CdSe/ZnTe2 (dash dot), d) CdSe/ZnTe3 (dash-dot-dot) and e) CdSe/ZnTe4 (thin solid line) 5.4 Normalized steady state emission spectra of a) CdSe 137 (thick solid line), b) CdSe/ZnTe1 (short dash), c) CdSe/ZnTe2 (dash dot), and d) CdSe/ZnTe3 (dash-dotdot) xxiv
5.5 Time resolved emission decay traces of a) CdSe, b) 139 CdSe/ZnTe1, and c) CdSe/ZnTe3 5.6 Transient absorption spectra of CdSe quantum dot (QD) at 142 different time delay after excitation at 400 nm laser light. Inset: Kinetic decay trace monitored at 690 nm. 5.7 Transient absorption spectra of CdSe/ZnTe3 (top panel) 144 and CdSe/ZnTe4 (bottom panel) Quantum dot core-shell at different time delay after excitation at 400 nm laser light. 5.8 Normalized kinetic traces of a) CdSe at 460 nm, b) 145 CdSe/ZnTe3 at 480 nm, and c) CdSe/ZnTe4 at 520 nm after excitation at 400 nm laser light. Inset: Same kinetics are shown at shorter time scale. 6.1 Transmission Electron Microscopy (High and Low 159 magnifications) and Electron Diffraction of G-CdTe samples. 6.2 Photoluminescence Spectra of a) CdTe and b) G-CdTe 161 after exciting the sample at 380 nm. Inset: optical absorption spectra of c) CdTe and d) G-CdTe. 6.3 Time-resolved emission kinetics of a) CdTe and b) G- 162 CdTe after exciting the sample at 400 nm 6.4 Transient absorption spectra of graphene oxide (GO) at 163 different time delay after exciting 400 nm laser pulse xxv
Page 1: Charge Transfer Dynamics in Quantum
Page 7: DECLARATION I, hereby declare that
Page 11: ACKNOWLEDGEMENTS It is my privilege
Page 14 and 15: 1.3.5. Defect Mediated Relaxation 2
Page 16 and 17: 2. 8. 4. White Light Generation- 45
Page 18 and 19: 6.2. Experimental 6.2.1.Synthesis o
Page 20 and 21: devices based on QDs it has been sh
Page 22 and 23: Furthermore generation of pump (~40
Page 24 and 25: shell). This clearly indicated that
Page 26 and 27: 12. V. I. Klimov, J. Phys. Chem. B,
Page 28 and 29: 1.13 Reactant and Product Potential
Page 32 and 33: 6.5 Transient decay kinetics of gra
Page 34 and 35: at 670 nm after exciting at 400 nm
Page 37 and 38: ABBREVIATIONS BET BQ CB CCD CdS CdT
Page 39: 1 Chapter 1
Page 42 and 43: 3 size dependent optical properties
Page 44 and 45: 5 1.2. Physics of Semiconductors 1.
Page 46 and 47: 7 As seen from the schematic, poten
Page 48 and 49: 9 Substituting this in Schrödinger
Page 50 and 51: 11 ( r, r ) ( r ) ( r ) (1.13) e
Page 52 and 53: 13 E E E 2 2 2 EX ne, le nh,
Page 54 and 55: 15 spherical symmetry of field. The
Page 56 and 57: 17 gE ( ) 2Em 2 3 3 (1.25) For a
Page 58 and 59: 19 1.3.2. Electron-Hole energy tran
Page 60 and 61: 21 Impact Ionization Figure 1.7. Sc
Page 62 and 63: 23 understanding on mechanistic asp
Page 64 and 65: 25 carriers are unable to sample th
Page 66 and 67: 27 CB VB QD Metal Figure. 1. 10. Sc
Page 68 and 69: 29 energy barrier. Therefore it is
Page 70 and 71: 31 1 f q 2 A qB (1.30) 2 In equa
Page 72 and 73: 33 Vibrational contribution can be
Page 74 and 75: 35 1. 7. 1. Electron Injection ET i
Page 76 and 77: 37 Under assumption of invariance o
Page 78 and 79: 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
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141 samples due to a very weak exci
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143 dynamical spectrum is negligibl
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145 Earlier authors [5.4] reported
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147 Sample t r(ps) t 1(ps) t 2(ps)
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149 In addition to the cooling dyna
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151 pulse-width time scale followed
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153 5.20. Sreejith Kaniyankandy, Sa
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155 CHAPTER 6 Charge Separation in
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157 Studies by Wang et. al. [6.15]
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159 graphene in a 1M NaOH solution.
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161 Intensity (a.u.) 5 4 3 2 1 CdTe
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163 dynamics of graphene oxide and
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165 GO as shown in the Figure 3 rev
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167 electron acceptor for Graphene.
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169 governs the recombination dynam
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171 Sample τ 1 (ps) τ 2 (ps) τ 3
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173 A (mO.D) 10.0 0.0 -10.0 -20.0 0
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175 involved in the relaxation may
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177 Electron quencher (benzoquinone
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179 Scheme 6.1. Schematic of Electr
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181 6.6. Reina, A.; Jia, X.; Ho, J.
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183 6.26. Kaiser, A. B.; Navarro, C
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185 assigned to injection into diff
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187 transfer from CdSe core to ZnTe
Page 238 and 239:
189 However the position of bands i
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