- Page 1: PHOTOLUMINESCENCE STUDIES IN HYDROG
- Page 5 and 6: LIST OF FIGURES 1.1 Comparison of a
- Page 7 and 8: 6.7 Comparison of decays for differ
- Page 9 and 10: different from those in c-Si. Thus
- Page 11 and 12: 11 (*) Photoluminescence 10^ J3 rz
- Page 13 and 14: (a) -*-ao-^ Crystalline 00 c Hi 'JK
- Page 15 and 16: 8 wavefunction of extended and loca
- Page 17 and 18: Figure 1.4: Schematic of density of
- Page 19 and 20: 12 10'- 'v, 10 10 > Thermalization
- Page 21 and 22: 14 energy turns out to be 10^ cm~^
- Page 23 and 24: 16 1.1.4.1 Radiative TunneUng Since
- Page 25 and 26: 18 Since doping introduces addition
- Page 27 and 28: 20 1 - /?c = 100 A V) C 10-' u c u
- Page 29 and 30: 22 where M is the matrix element of
- Page 31 and 32: 24 10* .^10* C It Temperature 12 K
- Page 33 and 34: 26 the temporal resolution needed t
- Page 35 and 36: 28 temperature, excitation energy,
- Page 37 and 38: CHAPTER n EXPERIMENTAL DETAILS 2.1
- Page 39 and 40: 32 Table 2.1: Deposition parameters
- Page 41 and 42: 34 In all cases, the films were dep
- Page 43 and 44: 36 2.2.2 Constant Photocurrent Meth
- Page 45 and 46: 38 alloys of a-Si:H. The shift in t
- Page 47 and 48: 40 dye laser pulse is typically 500
- Page 49 and 50: 42 The rise time of this tube is ~
- Page 51 and 52: CHAPTER in DATA ANALYSIS 3.1 Calibr
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46 in CM o cs CO ^-» c D ^ h— CD
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48 the decay parameters obtained fr
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50 where a, and r, are the zero-tim
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52 U3 CO »^7 O tn - 0.0 10.0 20.0
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54 lifetime distribution. This sugg
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56 separately because, according to
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58 Table 4.1: Summary of characteri
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60 1.1 1.2 1.3 1.4 Energy (eV) Figu
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62 chapter, the total contribution
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64 in d o At 1.46 eV c O _SCD o CJ
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66 As the Fermi level lies somewher
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68 of these states as a function of
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70 thermalization depth of electron
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72 Ennission Energy 1.40 eV 1.46 eV
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ecombination decreases (according t
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76 CO 00 3d- 0) E *a5S M_ O- "^ d o
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78 Although the three mean lifetime
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80 where E is the energy of the exc
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82 relative contribution of the lon
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84 4.2.5 Electric Field Dependence
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86 approximation, they model the PL
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88 more plausible with one major mo
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90 comparable lifetimes and a const
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CHAPTER V PHOTOLUMINESCENCE IN a-Si
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94 Table 5.1: Carbon Contents of th
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96 0.0 0.2 0.4 Composition(x) Figur
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98 integrated absorption follows th
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100 energy increases monotonically
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102 content (Fig. 5.5(b)) to almost
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104 carbon content are shown in Fig
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106 Li this equation, if we assume
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108 indicating a disorder broadenin
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110 the foUowing discussion we wiU
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112 in d o ai At 25K LEGEND • x=0
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114 Table 5.2: Comparison of ao for
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116 0.0 10.0 20.0 30.0 40.0 50.0 Ti
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118 in O in in oi x=0.99 • At 1.6
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120 PL decay at similar emission en
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122 needed to affect PL decays in t
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124 Siebert et al. [70] have found
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CHAPTER VI PHOTOLUMINESCENCE IN a-S
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128 Table 6.1: Correlation between
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130 0.00 0.03 0.06 0.09 Composition
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132 measurements shows a continuous
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134 CM d LEGEND x=0.00 x=0.05 'x=0.
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136 0.04 0.08 0.12 Urbach Energy(eV
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138 O o o CD O o GO CM x=0.00 x=0.0
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140 LEGEND x=0.05 x=^o:io • x=0.1
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142 Another possibility for the ins
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14-1 f 1.00 'co 4—» 'E Zj CD d-
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146 O d in O d CO • ^M^ c 3 x> ^
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148 discussion we wiU use --^ for c
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150 10 10* Field{V/cm) Figure 7.5:
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152 0.1 0.2 0.3 0.4 Relative Change
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154 The two curves exhibit a linear
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156 IpL (T=25 K,F=0). In the region
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and 158 j~r - 1 a r^ T < 100 K. (7.
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160 Thus, these two quantities are
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162 We think that this argument hol
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CHAPTER Vm CONCLUSIONS In this work
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166 This supports the disorder broa
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168 prepared a-Sii_xCx:H fUms and c
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REFERENCES [1] Carison, D.E., and W
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172 [36] Tauc, J., Grigorovici, R.
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174 [71] Palsule, C, Gangopadhyay,