In order to further improve the economies of scale which are inherent in ECD’s continuous roil-to-roll amorphous silicon alloy solar cell manufacturing process, we have developed a concept for a serpentine web plasma CVD deposition process to maximize throughput while keeping the size of the deposition chambers small. When this technique is incorporated into a continuous rollto-roll PV manufact...

GaAs nanowires (NWs) offer the possibility of decoupling light absorption from charge transport for high-performance photovoltaic (PV) devices. However, it is still an open question as to whether these devices can exceed the Shockley-Queisser efficiency limit for single-junction PV. In this work, single standing GaAs-based nanowire solar cells in both radial and vertical junction configurations...

Photoanode passivation, electrolyte additives and electrocatalytic high surface area counter electrodes control the liquid junction quantum dot solar cell (QDSC) performance.

Quantum wells enable solar cell bandgaps to be tailored to the theoretical optimum, under the assumption of unity absorption. In practice however, quantum well regions are thinner and hence absorb less strongly than bulk material. We predict detailed balance efficiency limits for varying levels of absorptivity in singleand double-junction quantum-well solar cells. These calculations allow us to...

We report the initial results of GaAs and GaInP solar cells grown by all solid-state molecular-beam-epitaxy (MBE) technique. For GaAs single-junction solar cell, with the application of AlInP as the window layer and GaInP as the back surface field layer, the photovoltaic conversion efficiency of 26% at one sun concentration and air mass 1.5 global (AM1.5G) is realized. The efficiency of 16.4% i...

Organic–inorganic metal halide perovskite solar cells represent the fastest advancing cell technology in terms of energy conversion efficiency improvement, as seen last decade. This has become a promising for next-generation, low-cost, high-efficiency photovoltaics including multi-junction tandem concepts. Double-junction have much higher limits 45%, beyond Shockley–Queisser single-junction cel...

In this paper describes a simple model for tunnel junction (GaAs) between the top cell (GaAs) and bottom cell (Ge) of cascade solar cells. We theoretically studied the electrical characteristics (IV) of GaAs tunnel diode with the accounting program MATLAB for doping concentration of the junction after Using this model between two cascaded solar cell (GaAs / Ge) and we calculate the electrical c...

An electroluminescence microscopy combined with a spectroscopy was developed to visually analyze multi-junction solar cells. Triple-junction solar cells with different conversion efficiencies were characterized by using this system. The results showed that the mechanical damages and material defects in solar cells can be clearly distinguished, indicating a high-resolution imaging. The external ...