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US 2022/0069151 A1Published application
Photovoltaic devices and methods of forming the same
AssigneeFirst Solar, Inc.
InventorsRick Powell, Jongwoo Choi
Life of this patent
Estimating the term…
Abstract
A photovoltaic device includes an electron blocking layer (EBL) and an absorber layer. The EBL is positioned between the absorber layer and a back contact layer. A material of the EBL is a cadmium zinc telluride Cd(1-y)Zn(y)Te, and a material of the absorber layer is a cadmium telluride selenide CdTe(1-x)Se(x) producing a lattice mismatch between the materials of the EBL and between the materials of the absorber of less than about two tenths of a percent when x˜y and has a value less than about 0.4.
Claims17
A photovoltaic device, comprising:
- a front layer stack, wherein the front layer stack comprises a plurality of transparent layers;
- an absorber layer having a first surface disposed on the front layer stack and a second surface, the absorber layer comprising cadmium, tellurium, and selenium;
- an electron blocking layer having a first surface disposed on the second surface of the absorber layer and a second surface, the first surface of the electron blocking layer having a band gap that is at least 0.1 eV greater than a band gap of the second surface the absorber layer;
- and
- a back contact layer disposed on the second surface of the electron blocking layer;
- wherein:
- the electron blocking layer comprises cadmium, zinc, and tellurium;
- and
- a lattice mismatch between the electron blocking layer relative to the absorber layer is less than 4%.
6 more elements
A photovoltaic device, comprising:
- an electron blocking layer formed from Cd(1-y)Zn9y)Te, wherein y is less than 0.4;
- and
- an absorber layer formed from CdTe(1-x)Se(x), wherein x is less than 0.4;
- and
- wherein a lattice mismatch between the electron blocking layer relative to the absorber layer is less than 4%.
2 more elements
17-40. (canceled)
Dependencies are inferred from the claim text.