thereby providing solar cells that can be constructed to utilize a larger fraction of the solar spectrum in some cases the electron conductor may include group iii nitride based materials a solar cell assembly is also disclosed that may include a first quantum dot solar cell and a second quantum dot solar cell the first and second quantum dot solar cells may be tuned for differing portions of the electromagnetic spectrum application_number US 50463809 A description the following description should be read with reference to the drawings in which like elements in different drawings are numbered in like fashion the drawings which are not necessarily to scale depict selected embodiments and are not intended to limit the scope of the invention although examples of construction dimensions and materials are illustrated for the various elements those skilled in the art will recognize that many of the examples provided have suitable alternatives that may be utilized quantum dot solar cells may include an electron conductor a hole conductor and a quantum dot incident solar energy may be absorbed by the quantum dot each photon generates one or more electron hole pairs the electrons are transferred to the electron conductor the quantum dot is regenerated by capture of an electron from the valence band of the hole conductor this may be considered as equivalent to transfer of a hole from the quantum dot to the hole conductor for efficient electron transfer there are particular energy relationships that may be useful as illustrated in fig1 fig1 is an energy diagram illustrating particular relationships between components of a quantum dot solar cell.