Daniel Eustace | University of Connecticut (original) (raw)
Papers by Daniel Eustace
Photovoltaic Specialists Conference, 1981
The highest efficiencies achieved with single crystals are 14.1% for ITO/n-SI and 13.3% of SnO2/n... more The highest efficiencies achieved with single crystals are 14.1% for ITO/n-SI and 13.3% of SnO2/n-Si, while the corresponding values for polysilicon are 11.2% and 10.1%. For large area single crystal devices the efficiency values are 11.7% and 11.2% for ITO and SnO2 cells, respectively, while for polysilicon the corresponding values are 9.82% and 8.55%. The lower efficiency for large area devices is mainly due to lower J sub sc and FF. Results are presented to show the optimum grid spacing required. From stability studies it is shown that there are two distinct mechanisms for degradation, one optical and the other thermal. The optical degradation could be eliminated if the cells could be protected from uv light and the thermal degradation can be prevented if the cells are operated below 100 C.
Photovoltaic Specialists Conference, Sep 1, 1982
Optimization of the spray-deposition process, metal-grid pattern, and AR properties of SnO/sub 2/... more Optimization of the spray-deposition process, metal-grid pattern, and AR properties of SnO/sub 2/ and ITO films have yielded high efficiency SnO/sub 2//n-Si and ITO/n-Si cells. An efficiency of 14.6% has been achieved for a 4.2 cm/sup 2/ ITO/n-Si cell. And for large area (20 cm/sup 2/) cells the authors have obtained efficiencies of 13.6% and 13.8% for SnO/sub 2//n-Si and ITO/n-Si cells, respectively. High efficiency modules consisting of 2-inch diameter cells connected in series were made and shown to be compatible with the standard EVA encapsulation process used for p-n junction silicon cells. The authors have found that the UV-induced degradation in V/SUB oc/ can be restored by low temperature annealing. Many UV light absorbing material placed in front of the cells can eliminate degradation. In particular, SnO/sub 2//n-Si and ITO/n-Si cells encapsulated in EVA do not show any decrease in V/SUB oc/ and efficiency over an extended period of sunlight exposure.
The Journal of Physical Chemistry, Sep 1, 1971
Page 1. Dechlorination yields were typical of those obtained from cyclohexane solutions of a halo... more Page 1. Dechlorination yields were typical of those obtained from cyclohexane solutions of a halogenated hydro-carbon which does not undergo chain dechlorination.' Carbon tetrachloride under the same conditions under-goes ...
Advances in photochemistry, 1971
An improved electrolyte is disclosed for an Li/TiS/sub 2/ current producing system, such as a bat... more An improved electrolyte is disclosed for an Li/TiS/sub 2/ current producing system, such as a battery, features at least one lithium solute of the general formula LiXF /SUB a/, where X is selected from a group consisting of B, P, Sb, and As, and wherein a is 4 for B and 6 for P, Sb, and As. The solute(s) are supported in a solvent consisting of at least 1,3 dioxolane, and more particularly in a mixture of 1,3 dioxolane (DIOX) and 1,2 dimethoxyethane (DME) ranging in percent ratios of (DIOX:DME) from 100/0 to 40/60 by weight.
Journal of Applied Polymer Science, Feb 20, 1988
Polyacrylamide and poly(acrylic acid) form a water‐insoluble phase when solutions of the two havi... more Polyacrylamide and poly(acrylic acid) form a water‐insoluble phase when solutions of the two having concentrations that are not too low are mixed. The insoluble complex contains nearly stoichiometric 1 : 1 ratios of acrylamide and acrylic acid. The phase behavior of the ternary system was studied as a function of the degree of neutralization, α, of poly(acrylic acid). The complex is not formed when α is high. The formation of the complex was studied by measurement of pH increases observed when poly(acrylic acid) was titrated with polyacrylamide to infer a degree of linkage, θ, between the two polymers. A Hill plot of the data showed that the association was cooperative when the molecular weight was high.
An improved aqueous metal--halogen electrochemical cell, particularly, a zinc bromide cell, conta... more An improved aqueous metal--halogen electrochemical cell, particularly, a zinc bromide cell, contains a water-soluble tetraorgano-substituted ammonium salt in the electrolyte which forms a substantially water-insoluble liquid complex with cathodic halogen, and thereby reduces self-discharge of the cell. Particularly preferred as the ammonium salt is N-ethyl, N-methyl morpholinium bromide. 1 figure, 6 tables.
Journal of Applied Electrochemistry, Nov 1, 1980
Services (DCS) offers career assistance and information on employment issues to chemistry profess... more Services (DCS) offers career assistance and information on employment issues to chemistry professionals. This booklet contains the most up-to-date information available on interviewing, based on observations of employment interviews, and can be used by the chemist at any career stage. Previous editions were published in 1994, 1996, and 1998. This edition was updated by ACS career consultants, Joel Shulman, PhD and Dorothy Rodmann. Additional input was provided by ACS career consultants
During the present quarter efficiency of heterostructure solar cells has been increased from 13 t... more During the present quarter efficiency of heterostructure solar cells has been increased from 13 to 13.7% for single crystal and from 10.3 to 11.2% for polysilicon. For polysilicon the improvements can be attributed to reductions in grid-area coverage and in reflection losses and for single crystal to a combination of reduction in grid-area coverage and increase in fill factor. The heterostructure cells in both cases were IT0/n-Si solar cells. Degradation in Sn0/sub 2//n-Si solar cells can be greatly reduced to negligible proportions by proper encapsulation. The cells used in stability tests have an average initial efficiency of 11% which reduces to a value of about 10.5% after 6 months of exposure to sunlight and ambient conditions. This small degradation occurs within the first month, and the efficiency remains constant subsequently. The reduction in efficiency is due to a decrease in the open-circuit voltage only, while the short-circuit current and fill factor remain constant. Th...
Journal of the American Chemical Society, 1972
ions from various sources (first column of Table I) have been produced in the presence of the H-a... more ions from various sources (first column of Table I) have been produced in the presence of the H-and D-donors given in column 3 of Table I. If all CzD3Hz+ retain the structure indicated by the precursor only CD3CH3 will be formed in the reaction C2D3H2++ RH-. t ...
Journal of Electronic Materials, 1982
Grain boundary barriers play a dominant role in the transport properties of polycrystalline silic... more Grain boundary barriers play a dominant role in the transport properties of polycrystalline silicon. As a result, resistivity and Hall measurements in polysilicon, when interpreted in the normal manner used for single crystals, do not represent in general the same physical entities as in single crystals. The bulk of the grain is more conducting and has a larger free carrier
Journal of The Electrochemical Society, 1978
Journal of The Electrochemical Society, 1980
Journal of The Electrochemical Society, 1980
Journal of The Electrochemical Society, 1983
Spectrometrie a resonance magnetique nucleaire utilisant le 31 P. On montre qu'un controle ef... more Spectrometrie a resonance magnetique nucleaire utilisant le 31 P. On montre qu'un controle efficace des niveaux en H 2 PO 2 − et HPO 3 2− est necessaire quant a l'obtention de bons depots
Photovoltaic Specialists Conference, 1981
The highest efficiencies achieved with single crystals are 14.1% for ITO/n-SI and 13.3% of SnO2/n... more The highest efficiencies achieved with single crystals are 14.1% for ITO/n-SI and 13.3% of SnO2/n-Si, while the corresponding values for polysilicon are 11.2% and 10.1%. For large area single crystal devices the efficiency values are 11.7% and 11.2% for ITO and SnO2 cells, respectively, while for polysilicon the corresponding values are 9.82% and 8.55%. The lower efficiency for large area devices is mainly due to lower J sub sc and FF. Results are presented to show the optimum grid spacing required. From stability studies it is shown that there are two distinct mechanisms for degradation, one optical and the other thermal. The optical degradation could be eliminated if the cells could be protected from uv light and the thermal degradation can be prevented if the cells are operated below 100 C.
Photovoltaic Specialists Conference, Sep 1, 1982
Optimization of the spray-deposition process, metal-grid pattern, and AR properties of SnO/sub 2/... more Optimization of the spray-deposition process, metal-grid pattern, and AR properties of SnO/sub 2/ and ITO films have yielded high efficiency SnO/sub 2//n-Si and ITO/n-Si cells. An efficiency of 14.6% has been achieved for a 4.2 cm/sup 2/ ITO/n-Si cell. And for large area (20 cm/sup 2/) cells the authors have obtained efficiencies of 13.6% and 13.8% for SnO/sub 2//n-Si and ITO/n-Si cells, respectively. High efficiency modules consisting of 2-inch diameter cells connected in series were made and shown to be compatible with the standard EVA encapsulation process used for p-n junction silicon cells. The authors have found that the UV-induced degradation in V/SUB oc/ can be restored by low temperature annealing. Many UV light absorbing material placed in front of the cells can eliminate degradation. In particular, SnO/sub 2//n-Si and ITO/n-Si cells encapsulated in EVA do not show any decrease in V/SUB oc/ and efficiency over an extended period of sunlight exposure.
The Journal of Physical Chemistry, Sep 1, 1971
Page 1. Dechlorination yields were typical of those obtained from cyclohexane solutions of a halo... more Page 1. Dechlorination yields were typical of those obtained from cyclohexane solutions of a halogenated hydro-carbon which does not undergo chain dechlorination.' Carbon tetrachloride under the same conditions under-goes ...
Advances in photochemistry, 1971
An improved electrolyte is disclosed for an Li/TiS/sub 2/ current producing system, such as a bat... more An improved electrolyte is disclosed for an Li/TiS/sub 2/ current producing system, such as a battery, features at least one lithium solute of the general formula LiXF /SUB a/, where X is selected from a group consisting of B, P, Sb, and As, and wherein a is 4 for B and 6 for P, Sb, and As. The solute(s) are supported in a solvent consisting of at least 1,3 dioxolane, and more particularly in a mixture of 1,3 dioxolane (DIOX) and 1,2 dimethoxyethane (DME) ranging in percent ratios of (DIOX:DME) from 100/0 to 40/60 by weight.
Journal of Applied Polymer Science, Feb 20, 1988
Polyacrylamide and poly(acrylic acid) form a water‐insoluble phase when solutions of the two havi... more Polyacrylamide and poly(acrylic acid) form a water‐insoluble phase when solutions of the two having concentrations that are not too low are mixed. The insoluble complex contains nearly stoichiometric 1 : 1 ratios of acrylamide and acrylic acid. The phase behavior of the ternary system was studied as a function of the degree of neutralization, α, of poly(acrylic acid). The complex is not formed when α is high. The formation of the complex was studied by measurement of pH increases observed when poly(acrylic acid) was titrated with polyacrylamide to infer a degree of linkage, θ, between the two polymers. A Hill plot of the data showed that the association was cooperative when the molecular weight was high.
An improved aqueous metal--halogen electrochemical cell, particularly, a zinc bromide cell, conta... more An improved aqueous metal--halogen electrochemical cell, particularly, a zinc bromide cell, contains a water-soluble tetraorgano-substituted ammonium salt in the electrolyte which forms a substantially water-insoluble liquid complex with cathodic halogen, and thereby reduces self-discharge of the cell. Particularly preferred as the ammonium salt is N-ethyl, N-methyl morpholinium bromide. 1 figure, 6 tables.
Journal of Applied Electrochemistry, Nov 1, 1980
Services (DCS) offers career assistance and information on employment issues to chemistry profess... more Services (DCS) offers career assistance and information on employment issues to chemistry professionals. This booklet contains the most up-to-date information available on interviewing, based on observations of employment interviews, and can be used by the chemist at any career stage. Previous editions were published in 1994, 1996, and 1998. This edition was updated by ACS career consultants, Joel Shulman, PhD and Dorothy Rodmann. Additional input was provided by ACS career consultants
During the present quarter efficiency of heterostructure solar cells has been increased from 13 t... more During the present quarter efficiency of heterostructure solar cells has been increased from 13 to 13.7% for single crystal and from 10.3 to 11.2% for polysilicon. For polysilicon the improvements can be attributed to reductions in grid-area coverage and in reflection losses and for single crystal to a combination of reduction in grid-area coverage and increase in fill factor. The heterostructure cells in both cases were IT0/n-Si solar cells. Degradation in Sn0/sub 2//n-Si solar cells can be greatly reduced to negligible proportions by proper encapsulation. The cells used in stability tests have an average initial efficiency of 11% which reduces to a value of about 10.5% after 6 months of exposure to sunlight and ambient conditions. This small degradation occurs within the first month, and the efficiency remains constant subsequently. The reduction in efficiency is due to a decrease in the open-circuit voltage only, while the short-circuit current and fill factor remain constant. Th...
Journal of the American Chemical Society, 1972
ions from various sources (first column of Table I) have been produced in the presence of the H-a... more ions from various sources (first column of Table I) have been produced in the presence of the H-and D-donors given in column 3 of Table I. If all CzD3Hz+ retain the structure indicated by the precursor only CD3CH3 will be formed in the reaction C2D3H2++ RH-. t ...
Journal of Electronic Materials, 1982
Grain boundary barriers play a dominant role in the transport properties of polycrystalline silic... more Grain boundary barriers play a dominant role in the transport properties of polycrystalline silicon. As a result, resistivity and Hall measurements in polysilicon, when interpreted in the normal manner used for single crystals, do not represent in general the same physical entities as in single crystals. The bulk of the grain is more conducting and has a larger free carrier
Journal of The Electrochemical Society, 1978
Journal of The Electrochemical Society, 1980
Journal of The Electrochemical Society, 1980
Journal of The Electrochemical Society, 1983
Spectrometrie a resonance magnetique nucleaire utilisant le 31 P. On montre qu'un controle ef... more Spectrometrie a resonance magnetique nucleaire utilisant le 31 P. On montre qu'un controle efficace des niveaux en H 2 PO 2 − et HPO 3 2− est necessaire quant a l'obtention de bons depots