Basic Research Needs for Solar Energy Utilization - Office of ...

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SOLAR ELECTRICITY BACKGROUND OF PHOTOVOLTAICS A diagram of a p-n junction photovoltaic (PV) solar cell is shown in Figure 66. The solar spectrum at air mass 1.5 (AM1.5) (solar intensity at Earth’s surface with sun at 42º elevation from the horizon) is shown in Figure 67a; the maximum conversion efficiency of single-bandgap solar cells as a function of the semiconductor band gap, assuming full electron-phonon relaxation, is shown in Figure 67b. Figure 66 A p-n junction PV solar cell 187
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On the Cover: One route to harvesti
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Revisions, September 2005 p ix, par
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CONTENTS (CONT.) Appendix 4: Additi
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OEC oxygen-evolving complex PCET pr
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viii
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thin films, organic semiconductors,
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genetic sequencing, protein product
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INTRODUCTION The supply and demand
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showing promise to overcome them. T
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GLOBAL ENERGY RESOURCES 7
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energy can be exploited on the need
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BASIC RESEARCH CHALLENGES FOR SOLAR
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CONVERSION OF SUNLIGHT INTO ELECTRI
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PHYSICS OF PHOTOVOLTAIC CELLS Inorg
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Figure 4 Learning curve for PV prod
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Needs of Direct-gap, Thin-film Phot
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Figure 6 Current record efficiencie
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devices. The molecules and material
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Figure 8 Structure for high-efficie
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One critical property of the photoa
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PHOTOELECTROCHEMICAL STORAGE CELLS
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BASIC RESEARCH CHALLENGES FOR SOLAR
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information about the proteins that
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convert it into H2 and liquid fuels
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charge separation ensures highly ef
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Efficient Photo-initiated Charge Se
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artificial RCs, have proven to be i
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CATALYSTS FOR CO2 REDUCTION Photo-d
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Upon photoexcitation, the electron
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(5) determining the physical and ch
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following challenges must be met: (
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A.F. Heyduk and D.G. Nocera, “Hyd
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J. Seth, V. Palaniappan, R.W. Wagne
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THREE TYPES OF CONCENTRATED SOLAR
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Solar Thermal to Electric Energy Co
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Tm = mean temperature Z = measure o
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control and further diode developme
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An overview of solar thermochemical
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for electron and phonon band struct
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coefficient. The thermal conductivi
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J.J. Greffet, R. Carminati, K. Joul
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CROSS-CUTTING RESEARCH CHALLENGES B
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ange of time and length scales span
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Research Issues Advances in the syn
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Advances across several science fro
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Figure 19 Transparent conductive el
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Carrier generation, relaxation, and
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E. Hutter and J.H. Fendler, “Expl
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PRIORITY RESEARCH DIRECTIONS Revolu
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RESEARCH DIRECTIONS Several paths e
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Multiple Energy Level Solar Cells I
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Strain Relaxation. Growth of layers
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the relevant elastic and inelastic
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A.J. Nozik, “Quantum Dot Solar Ce
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these new organic structures, and t
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Figure 30 Schematic diagram (right)
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carrier injection between the indiv
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108
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Figure 32 One important example of
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interface for charge separation. Fo
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• Light harvesting, • Advanced
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116
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Multicomponent structures are often
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REFERENCES A.J. Bard and M.A. Fox,
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PLANT PRODUCTIVITY AND BIOFUEL PROD
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een made in identifying and charact
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126
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SUMMARY OF RESEARCH DIRECTION The k
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developing multi-electron catalytic
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coupling in multi-cofactor-containi
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134
Page 150 and 151: low toxicity, and processibility. T
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Page 154 and 155: largely unknown are the fundamental
Page 156 and 157: nanostructure design, and developme
Page 158 and 159: ealize an efficient artificial phot
Page 160 and 161: Figure 46 Defect-tolerant solar cel
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Page 164 and 165: H2SO4 at 1,130K, and the University
Page 166 and 167: the sequestration step, these solar
Page 168 and 169: P. von Zedtwitz and A. Steinfeld,
Page 170 and 171: The continued advances in energy- a
Page 172 and 173: for the detailed understanding and
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Page 176 and 177: A shortcoming of this approach is t
Page 178 and 179: of ~2.4 at 300K and quantum-dot PbT
Page 180 and 181: High-throughput Experimental Screen
Page 182 and 183: Solar Concentrators and Hot Water H
Page 184 and 185: G. Chen, M.S. Dresselhaus, J.-P. Fl
Page 186 and 187: Materials and Processing Methods to
Page 188 and 189: materials and fabrication approache
Page 190 and 191: multi-electron H2O and CO2 activati
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Page 194 and 195: 180
Page 196 and 197: and quantum dots. Quantum dots are
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Page 202 and 203: Flux (mA/eV.cm2 Flux (mA/eV.cm ) 2
Page 204 and 205: Table 1 Worldwide PV Module Product
Page 206 and 207: Amorphous Silicon. From its discove
Page 208 and 209: Table 2 Are There Enough Materials
Page 210 and 211: passivating window and back-surface
Page 212 and 213: R.R. King, C.M. Fetzer, K.M. Edmond
Page 214 and 215: currently accounting for only a sma
Page 216 and 217: Anaerobic Digestion One gasificatio
Page 218 and 219: Electrolysis is the process for bre
Page 220 and 221: alkaline electrolyzers require a mi
Page 222 and 223: maintenance costs of the small prod
Page 224 and 225: P. Courty, P. Chaumette, and C. Rai
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Page 228 and 229: periods and extend the system opera
Page 230 and 231: When ηopt < 1, Equation (2) become
Page 232 and 233: Receiver & Power Conversion Unit So
Page 234 and 235: Figure 77 General concept of solar-
Page 236 and 237: Other areas whose development could
Page 238 and 239: THERMOPHOTOVOLTAICS Thermophotovolt
Page 240 and 241: N. Benz and Th. Kuckelkorn, “A Ne
Page 242 and 243: R.A. Sherif, H.L. Cotal, R.R. King,
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Page 246 and 247: Sub-panelists Edmond Amouyal, Centr
Page 248 and 249: Terry Tritt, Clemson University Joh
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236
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Plenary Closing Session — Wednesd
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Panel 1C (Photoelectrochemistry)
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Agenda for Solar Fuels Breakout Ses
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Tuesday, April 19, 2005, 8:00 a.m.
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Wednesday, April 20, 2005, 8:00 a.m
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Wednesday, April 20, 2005, 8:00 a.m
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250
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R. Corkish, S. Kettemann, and J. Ne
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T. Polivka and V. Sundstrom, “Ult
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256
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258
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microscopy, 81, 85, 101, 155-157, 1
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