NOVELTY - The quantum dot photovoltaic solar cell comprises a first electrode disposed on a glass substrate (101), a nanocrystal film of a single material disposed in contact with the first electrode, and a second electrode (104) disposed in contact with the nanocrystal film. The nanocrystal film is made of a single quantum dot material and a colloidal nanocrystal material, and is a layer-by-layer deposited film of nanocrystal material alternately in cycles. The first electrode is a thin metal film allowing for the transmission of sunlight, and a transparent conductor.    USE - Used as a quantum dot photovoltaic solar cell.    ADVANTAGE - The efficient quantum dot photovoltaic solar cell has high conversion efficiency.    DETAILED DESCRIPTION - The quantum dot photovoltaic solar cell comprises a first electrode disposed on a glass substrate (101), a nanocrystal film of a single material disposed in contact with the first electrode, and a second electrode (104) disposed in contact with the nanocrystal film. The nanocrystal film is made of a single quantum dot material and a colloidal nanocrystal material, and is a layer-by-layer deposited film of nanocrystal material alternately in cycles. The first electrode is a thin metal film allowing for the transmission of sunlight, and a transparent conductor forming an ohmic contact with quantum dot (QD) film. The second electrode has an encapsulant (105), forms a Schottky junction with the nanocrystal film and an ohmic contact with the QD film, and is a metal with a work function different from the first electrode and also forms an ohmic contact with the QD film. The first and second electrodes are heavily doped n-type and p-type electrodes, which form ohmic contacts with the QD film. The nanocrystal film is a layer-by-layer deposited film of nanocrystal material alternately added and coated with ligand exchange material in cylces. An INDEPENDENT CLAIM is included for a method for making a solar cell.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic elevational view of a solar cell.    Glass substrate (101)    First electrode material (102)    Quantum dot film (103)    Second electrode (104)    Encapsulant. (105)