NOVELTY - A multiple quantum well structure (1) comprises a multiple layer structure (2)comprising alternating well (3) and barrier layers (4) comprising first and second materials respectively stacked in a first direction, where each barrier layer has several holes (6) filled with a third material to form several respective bridge regions (9) through the layer which connect adjacent well layers, where the bridge regions having dimensions of not greater than 50 nm in directions perpendicular to the first direction.    USE - As multiple quantum well structure (claimed), used in photovoltaic cell (claimed), or solar cells as power sources in portable devices, such as desktop calculators, and in remotely-located systems, such as satellites.    ADVANTAGE - The multiple quantum well structure improves charge carrier transport through a multiple quantum well structure without substantially affecting absorption characteristics of the structure, even when materials such as silicon and silicon oxide (and other silicon-based dielectrics) are used.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) photovoltaic cell comprising first and second contacts; and multiple quantum well structure disposed between the first and second contacts;    (2) method involving connecting a load across photovoltaic cells, and arranging the photovoltaic cell such that, during daytime, the photovoltaic cell is exposed to sunlight, an    (3) fabricating a multiple quantum well structure involving providing alternating well and barrier layers comprising first and second materials respectively stacked in a first direction, where each barrier layer has several holes filled with a third material so to form several respective bridge regions through the layer which connect adjacent well layers, the bridge regions having dimensions of not greater than 50 nm.    DESCRIPTION OF DRAWING(S) - The figure shows schematic cross sectional view of a multiple quantum well structure.    Multiple quantum well structure (1)    Multiple layer structure (2)    Alternating well (3)    Holes (6)    Opposite surfaces of barrier layer (7, 8)    Bridge regions (9)