A cathode of a solar unit and a solar cell including thereof are provided. The cathode of solar unit includes a film which is formed by curing a composition, and a pixel electrode which is formed on the film; wherein the composition includes conducting polymer, curing material, ionic liquid and phosphorene, wherein the weight ratio of the phosphorene to the sum of the conducting polymer, the curing material and the ionic liquid is about 2%10%.

In some examples, an assembly including at least one vertical support; a plurality of Heliopanels affixed to the at least one vertical support, each Heliopanel of the plurality of Heliopanels including one or more substrates; a plurality of Heliocells affixed to the one or more substrates of the plurality of Heliopanels such that a plurality of continuous gaps is defined between adjacent Heliocells and wherein the gaps permit air, water and sunlight to pass through the Heliopanels, wherein each Heliocells of the plurality of Heliocells includes one or more solar cell units, and wherein the solar cell units are contained in one or more encapsulants to protect the solar cell units from one or more of water and oxygen molecules, atmospheric pollutants, dirt, soot, and strong chemicals or by mechanical abrasion, impact, UV light, or temperature; and electrical conductors interconnecting the Heliocells to each another to form an electrical circuit.

In some examples, an assembly including at least one vertical support; a plurality of Heliopanels affixed to the at least one vertical support, each Heliopanel of the plurality of Heliopanels including one or more substrates; a plurality of Heliocells affixed to the one or more substrates of the plurality of Heliopanels such that a plurality of continuous gaps is defined between adjacent Heliocells and wherein the gaps permit air, water and sunlight to pass through the Heliopanels, wherein each Heliocells of the plurality of Heliocells includes one or more solar cell units, and wherein the solar cell units are contained in one or more encapsulants to protect the solar cell units from one or more of water and oxygen molecules, atmospheric pollutants, dirt, soot, and strong chemicals or by mechanical abrasion, impact, UV light, or temperature; and electrical conductors interconnecting the Heliocells to each another to form an electrical circuit.

A photovoltaic device is presented. The photovoltaic device includes a layer stack; and an absorber layer is disposed on the layer stack. The absorber layer comprises selenium, wherein an atomic concentration of selenium varies across a thickness of the absorber layer. The photovoltaic device is substantially free of a cadmium sulfide layer.

A photovoltaic device is presented. The photovoltaic device includes a layer stack; and an absorber layer is disposed on the layer stack. The absorber layer comprises selenium, wherein an atomic concentration of selenium varies across a thickness of the absorber layer. The photovoltaic device is substantially free of a cadmium sulfide layer.

A method for preparing a solar cell, includes: forming a first electrode on a substrate; forming a light absorbing layer on the first electrode; and forming a second electrode on the light absorbing layer, wherein the method further comprises forming an impurity material layer including an impurity element on the light absorbing layer adjacent to the first electrode or the second electrode in any one side or both sides thereof, and forming a doping layer by diffusing the impurity element into a portion of the light absorbing layer.

An inorganic nanocrystal solar cell comprising a substrate, a layer of metal, a layer of CdTe, a layer of CdSe, and a layer of transparent conductor. An inorganic nanocrystal solar cell comprising a transparent conductive substrate, a layer of CdSe, a layer of CdTe, and a Au contact. A method of spray deposition for inorganic nanocrystal solar cells comprising subjecting a first solution of CdTe or CdSe nanocrystals to ligand exchange with a small coordinating molecule, diluting the first solution in solvent to form a second solution, applying the second solution to a substrate, drying the substrate, dipping the substrate in a solution in MeOH of a compound that promotes sintering, washing the substrate with iPrOH, drying the substrate with N.sub.2, and heating and forming a film on the substrate.

An inorganic nanocrystal solar cell comprising a substrate, a layer of metal, a layer of CdTe, a layer of CdSe, and a layer of transparent conductor. An inorganic nanocrystal solar cell comprising a transparent conductive substrate, a layer of CdSe, a layer of CdTe, and a Au contact. A method of spray deposition for inorganic nanocrystal solar cells comprising subjecting a first solution of CdTe or CdSe nanocrystals to ligand exchange with a small coordinating molecule, diluting the first solution in solvent to form a second solution, applying the second solution to a substrate, drying the substrate, dipping the substrate in a solution in MeOH of a compound that promotes sintering, washing the substrate with iPrOH, drying the substrate with N.sub.2, and heating and forming a film on the substrate.

A photovoltaic device includes a substrate structure and a p-type semiconductor absorber layer. A photovoltaic device may include a CdSeTe layer. A process for manufacturing a photovoltaic device includes forming a CdSeTe layer over a substrate. The process includes forming a p-type cadmium selenide telluride absorber layer.

A photovoltaic device includes a substrate structure and a p-type semiconductor absorber layer. A photovoltaic device may include a CdSeTe layer. A process for manufacturing a photovoltaic device includes forming a CdSeTe layer over a substrate. The process includes forming a p-type cadmium selenide telluride absorber layer.