AbstractClock and data recovery (CDR) circuits using bang-bang phase detectors (BBPDs) are widel... more AbstractClock and data recovery (CDR) circuits using bang-bang phase detectors (BBPDs) are widely used in high speed serial links. The BBPD quantizes the phase difference between the input data and the recovered clock, generating a two state output for the loop ...
Conference Record of the IEEE Photovoltaic Specialists Conference, 2013
The performance effects of silicon nanocrystals (SiNC) embedded in a silicon dioxide matrix to ac... more The performance effects of silicon nanocrystals (SiNC) embedded in a silicon dioxide matrix to act as a down-shifting (DS) layer mounted on the top surface of a polycrystalline Cu(In,Ga)Se2 solar cell are explored numerically. The DS layers are modeled by modifying the incident AM1.5G spectrum based on the absorption and emission properties of the SiNC. The effects of the DS layers as an anti-reflection coating leads to an 11.4% relative improvement in short-circuit current density under 1-sun illumination (0.1 W/cm2). Comparatively, the effect of down-shifting high-energy photons to lower energy photons showed a 4% relative short-circuit current density improvement, albeit for an optical conversion efficiency of 80%.
Conference Record of the IEEE Photovoltaic Specialists Conference, 2012
The efficiency improvements achieved by adding idealized, top-mounted, down-conversion (DC) and l... more The efficiency improvements achieved by adding idealized, top-mounted, down-conversion (DC) and luminescent down-shifting (LDS) layers to a commercial grade silicon solar cell are studied. A comparison is then made to silicon nanocrystals (Si-NC) LDS layer coupled to a silicon solar cell, where the optical properties of the Si-NC are based on measured data. Since the modeled DC and LDS layers are electrically isolated from the solar cell, the devices are studied by modifying the incident AM1.5G spectrum according to the bandgap, absorption and emission profiles, and global efficiency of the DC and LDS layers. Simulation results indicate that a minimum DC/LDS efficiency of 1% is required to enhance the solar cell efficiency, and that this threshold rises to 38% for a Si-NC based LDS layer. Additionally, the incorporation of an optimal, perfectly efficient DC layer (200%) is shown to enhance the photovoltaic efficiency from 14.1% to 16.6% as opposed to
16.3% for a perfect LDS layer (100%).
AbstractClock and data recovery (CDR) circuits using bang-bang phase detectors (BBPDs) are widel... more AbstractClock and data recovery (CDR) circuits using bang-bang phase detectors (BBPDs) are widely used in high speed serial links. The BBPD quantizes the phase difference between the input data and the recovered clock, generating a two state output for the loop ...
Conference Record of the IEEE Photovoltaic Specialists Conference, 2013
The performance effects of silicon nanocrystals (SiNC) embedded in a silicon dioxide matrix to ac... more The performance effects of silicon nanocrystals (SiNC) embedded in a silicon dioxide matrix to act as a down-shifting (DS) layer mounted on the top surface of a polycrystalline Cu(In,Ga)Se2 solar cell are explored numerically. The DS layers are modeled by modifying the incident AM1.5G spectrum based on the absorption and emission properties of the SiNC. The effects of the DS layers as an anti-reflection coating leads to an 11.4% relative improvement in short-circuit current density under 1-sun illumination (0.1 W/cm2). Comparatively, the effect of down-shifting high-energy photons to lower energy photons showed a 4% relative short-circuit current density improvement, albeit for an optical conversion efficiency of 80%.
Conference Record of the IEEE Photovoltaic Specialists Conference, 2012
The efficiency improvements achieved by adding idealized, top-mounted, down-conversion (DC) and l... more The efficiency improvements achieved by adding idealized, top-mounted, down-conversion (DC) and luminescent down-shifting (LDS) layers to a commercial grade silicon solar cell are studied. A comparison is then made to silicon nanocrystals (Si-NC) LDS layer coupled to a silicon solar cell, where the optical properties of the Si-NC are based on measured data. Since the modeled DC and LDS layers are electrically isolated from the solar cell, the devices are studied by modifying the incident AM1.5G spectrum according to the bandgap, absorption and emission profiles, and global efficiency of the DC and LDS layers. Simulation results indicate that a minimum DC/LDS efficiency of 1% is required to enhance the solar cell efficiency, and that this threshold rises to 38% for a Si-NC based LDS layer. Additionally, the incorporation of an optimal, perfectly efficient DC layer (200%) is shown to enhance the photovoltaic efficiency from 14.1% to 16.6% as opposed to
16.3% for a perfect LDS layer (100%).
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16.3% for a perfect LDS layer (100%).
16.3% for a perfect LDS layer (100%).