Consolidated tables showing an extensive listing of the highest independently confirmed efficienc... more Consolidated tables showing an extensive listing of the highest independently confirmed efficiencies for solar cells and modules are presented. Guidelines for inclusion of results into these tables are outlined, and new entries since July 2015 are reviewed.
Measured forward and reverse current versus voltage curves for GaSb cells at various temperatures... more Measured forward and reverse current versus voltage curves for GaSb cells at various temperatures and for different substrate dopant densities are modeled. The authors show that tunneling across a lower bandgap for reverse-biased GaSb cells allows nondestructive reverse current flow at low voltages. Thus, the GaSb IR cell doubles as a bypass diode, providing shading protection for the GaAs cell. Measured GaSb quantum yield curves are also modeled, and the resultant minority carrier diffusion lengths are compared with electron beam induced current measurements. It is found that the GaSb cell properties are consistent with predictions based on a direct gap single-crystal material
2014 Ieee 40th Photovoltaic Specialist Conference, Jun 1, 2014
Characterizing photovoltaic (PV) device perfor- mance is important for the growth of the PV indus... more Characterizing photovoltaic (PV) device perfor- mance is important for the growth of the PV industry. Perfor- mance is often characterized by a set of key parameters for the PV device in question: open-circuit voltage, short-circuit current, and maximum power. For a wide range of devices, the key performance parameters are a function of the parameters of a single diode circuit model. In this paper, we developed a statistical model for current-voltage-irradiance data of a PV device using a five-parameter single diode model. The goal was to estimate the single diode model parameters and key performance parameters with quantified uncertainty. Specifically, we found maximum likelihood estimates, quantified uncertainty via confidence intervals for the model and key performance parameters, and explored two important statistical properties of this model—identifiability and estimability.
... WE McMahon, Sarah Kurtz, K. Emery, and MS Young National Renewable Energy Laboratory 1617 Col... more ... WE McMahon, Sarah Kurtz, K. Emery, and MS Young National Renewable Energy Laboratory 1617 Cole Blvd., Golden, CO 80401 ABSTRACT ... The cell temperature for each hour is: Tcell, hour = Tambient, hour + (40 °C)(Irradiancehour/800 Watts). ...
Consolidated tables showing an extensive listing of the highest independently confirmed efficienc... more Consolidated tables showing an extensive listing of the highest independently confirmed efficiencies for solar cells and modules are presented. Guidelines for inclusion of results into these tables are outlined, and new entries since July 2015 are reviewed.
Measured forward and reverse current versus voltage curves for GaSb cells at various temperatures... more Measured forward and reverse current versus voltage curves for GaSb cells at various temperatures and for different substrate dopant densities are modeled. The authors show that tunneling across a lower bandgap for reverse-biased GaSb cells allows nondestructive reverse current flow at low voltages. Thus, the GaSb IR cell doubles as a bypass diode, providing shading protection for the GaAs cell. Measured GaSb quantum yield curves are also modeled, and the resultant minority carrier diffusion lengths are compared with electron beam induced current measurements. It is found that the GaSb cell properties are consistent with predictions based on a direct gap single-crystal material
2014 Ieee 40th Photovoltaic Specialist Conference, Jun 1, 2014
Characterizing photovoltaic (PV) device perfor- mance is important for the growth of the PV indus... more Characterizing photovoltaic (PV) device perfor- mance is important for the growth of the PV industry. Perfor- mance is often characterized by a set of key parameters for the PV device in question: open-circuit voltage, short-circuit current, and maximum power. For a wide range of devices, the key performance parameters are a function of the parameters of a single diode circuit model. In this paper, we developed a statistical model for current-voltage-irradiance data of a PV device using a five-parameter single diode model. The goal was to estimate the single diode model parameters and key performance parameters with quantified uncertainty. Specifically, we found maximum likelihood estimates, quantified uncertainty via confidence intervals for the model and key performance parameters, and explored two important statistical properties of this model—identifiability and estimability.
... WE McMahon, Sarah Kurtz, K. Emery, and MS Young National Renewable Energy Laboratory 1617 Col... more ... WE McMahon, Sarah Kurtz, K. Emery, and MS Young National Renewable Energy Laboratory 1617 Cole Blvd., Golden, CO 80401 ABSTRACT ... The cell temperature for each hour is: Tcell, hour = Tambient, hour + (40 °C)(Irradiancehour/800 Watts). ...
Uploads
Papers by Keith Emery