Excitons and Plasmons in Nanoscale Systems

submitted by: RASEIBoulder
Summary: Due to growing populace and standard of living, many terawatts of energy will be needed in the near future. The sun is the largest source of carbon-neutral and renewable energy that we have available and it is the only source that can provide terawatts of energy without depleting rapidly or causing major environmental and climate concerns. To fulfill this role, revolutionary approaches to solar energy conversion are needed that provide energy at very high efficiency at very low...

Photovoltaics Technology: No Longer an Outlier

submitted by: icamp2012school
Larry Kazmerski, National Renewable Energy Laboratory Solar energy from photovoltaic devices has been around since the early days of the space race, but historically has not had a substantial impact on our global energy scheme. Is that now changing? Dr. Larry Kazmerski is the executive director of Science & Technology Partnerships at the National Renewable Energy Laboratory (NREL) in Golden, CO. He has worked at NREL for over 30 years and was previously the director of the National...

Progress towards Third Generation Solar Energy Conversion: Can Quantum Dot Solar Cells exceed the Shockley-Queisser Limit?

submitted by: RASEIBoulder
Summary: Power conversion efficiency is one of the most important parameters that can directly affect the overall cost of a PV installation. In the Shockley-Queisser detailed balanced analysis, the power conversion efficiency is limited to ~33% for a single light absorbing layer. The major energy loss occurs from the excess photon energy, energy greater than the semiconductor bandgap, which is lost as heat through electron-phonon coupling and subsequent phonon relaxation and energy...