Frontispiece: Evidence of two‐photon absorption in strain‐free quantum dot GaAs/AlGaAs solar cells (Phys. Status Solidi RRL 3/2013)

Abstract

To accommodate the need of energy‐related research for quality publications that keep the pace, pss (RRL) expands its coverage of photovoltaics and solar cells in a new regular section rrl solar, see the Rapid Research Letter by Andrea Scaccabarozzi et al. in this issue (). rrl solar calls for Rapid Research Letter and Review@RRL contributions in the following areas: • Photovoltaic materials preparation, optimization, characterization and physics • Significant solar cell advances, modeling or characterization results and techniques • Important and verified advances in PV efficiency • Novel and urgent results in photovoltaics concepts, physics and technology • All materials and device systems

InGaAs and GaAs quantum dot solar cells grown by droplet epitaxy

“…It was reported that DE allows the selforganization of strain-free GaAs QDs in AlGaAs barriers [17]. Two-photon absorption in strain-free GaAs/AlGaAs QDSCs grown via the DE method was confirmed [18]. While there are still opening questions to address to make QDSCs more efficient solar cells, such as the open-circuit voltage (V oc ) degradation and marginal photocurrent contribution from QDs, solar cells based on strain-free QDs are expected to improve cell performance because of the alleviation of strain-induced defects.…”