Abstract:
The present disclosure provides systems and methods for depositing an alkaline metal layer on an absorber to generate a copper-poor region at a surface of the absorber. The copper-poor region provides an increased efficiency over non-treated absorbers having copper-rich surfaces. The alkaline metal layer may be deposited by any suitable deposition method, such as, for example, a wet deposition method. After the alkaline metal layer is deposited, the absorber is annealed, causing the alkaline metal layer to interact with the absorber to reduce the copper-profile of the absorber at the interface between the alkaline metal layer and the absorber.
Abstract:
A method of forming a CIGS absorber wherein at least one source particle is selected and prepared as a powder or gel; the powder or gel is deposited on a substrate, compressed, and annealed. In some embodiments, a plurality of source particles are prepared as powders and mixed prior to deposition, compression, and annealing. In other embodiments, a plurality of source particles are individually deposited in layers, collectively compressed, and collectively annealed. In yet further embodiments, a plurality of source particles are individually deposited in layers, individually compressed, and collectively annealed.
Abstract:
A method for fabricating a solar cell using a nozzle assembly that includes a base portion, a scriber coupled to the base portion, and a nozzle coupled to the base portion such that the nozzle is positioned a predefined distance from a tip of the scriber is provided. The method generally comprises positioning a substructure that includes a buffer layer and an absorber layer proximate to the base portion. A P2 line is scribed through the buffer and absorber layers of the substructure using the scriber tip. A nanoparticle solution is sprayed, using the nozzle, onto at least one portion of the buffer layer at a predefined pressure when the P2 line is being scribed through the buffer and absorber layers such that a transparent conductive oxide (TCO) layer is inhibited from forming over the portion of the buffer layer that is being sprayed with the nanoparticle solution.
Abstract:
An apparatus includes a manifold coupled to a vapor source, the manifold having a plurality of nozzles, an inner cylinder, and an outer cylinder containing the inner cylinder with a space defined between the inner and outer cylinders. One of the inner cylinder or outer cylinder is rotatable with respect to the other of the inner cylinder or outer cylinder. The outer cylinder has an inlet coupled to the manifold to receive vapor from the nozzles. The outer cylinder has an outlet for dispensing the vapor.
Abstract:
A photovoltaic device includes a substrate; a back contact layer disposed above the substrate; an absorber layer for photon absorption disposed above the back contact layer; a buffer layer disposed above the absorber layer; a conductive coating disposed above the buffer layer; and a transparent conductive layer disposed over the conductive coating. The conductive coating includes at least one type of nanomaterial, which has at least one dimension in the range of from 0.5 nm to 1000 nm.
Abstract:
A method of fabricating a buffer layer of a photovoltaic device comprises: providing a substrate having a back contact layer disposed above the substrate and an absorber layer disposed above the back contact layer; depositing a metal layer on the absorber layer; and performing a thermal treatment on the deposited metal layer in an atmosphere comprising sulfur, selenium or oxygen, to form a buffer layer.
Abstract:
A sputtering apparatus comprises a chamber configured to contain at least one sputter target and at least one substrate to be coated. The chamber has at least one adjustable shielding member defining an adjustable aperture. The member is positioned between the at least one sputter target and the at least one substrate. The aperture is adjustable in at least one of the group consisting of area and shape.
Abstract:
Methods and systems for repairing oxidation of CIGS surfaces during manufacture of a CIGS solar cell are generally disclosed. Oxidation of an absorber reduces the photoluminescence intensity of the CIGS surface. The absorber is immersed in a reduction tank having a reducing reagent therein. The reducing reagent reverses the oxidation of the CIGS absorber, increasing the interface quality and corresponding photoluminescence intensity. After reversing the oxidation, a buffer layer is deposited on the CIGS absorber to prevent further surface oxidation.
Abstract:
A solar cell device and a method of fabricating the device is described. The solar cell is fabricated by forming a back contact layer on a front side of a substrate, forming an absorber layer on the back contact layer, applying a protective layer on a back side of the substrate, depositing a buffer layer on the absorber layer. Excess buffer materials are deposited on the substrate back side, and the protective layer with excess buffer materials are removed.
Abstract:
A solar cell includes an absorber layer formed of a CIGAS, copper, indium, gallium, aluminum, and selenium. A method for forming the absorber layer provides for using an indium-aluminum target and depositing an aluminum-indium film as a metal precursor layer using sputter deposition. Additional metal precursor layers such as a CuGa layer are also provided and a thermal processing operation causes the selenization of the metal precursor layers. The thermal processing operation/selenization operation converts the metal precursor layers to an absorber layer. In some embodiments, the absorber layer includes a double graded chalcopyrite-based bandgap.