Radially stacked solar cells based on 2D atomic crystals and methods for their production
First Claim
1. A method for fabricating a solar cell, comprising:
- forming a sacrificial layer;
forming a barrier layer having a gradient strain on the sacrificial layer;
attaching a heterostructure comprising a first light absorbing layer and at least a second light absorbing layer to the barrier layer, wherein the second light absorbing layer is attached to the first light absorbing layer and thereby forms a heterojunction at an interface between the first light absorbing layer and the second light absorbing layer; and
removing the sacrificial layer subsequent to the attaching of the first light absorbing layer and the second light absorbing layer to the barrier layer,wherein the barrier layer, the first light absorbing layer, and the second light absorbing layer form a spiral structure having a spiral shape resulting from the gradient strain of the barrier layer.
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Accused Products
Abstract
A solar cell for collecting solar radiation can include a barrier layer such as a dielectric barrier layer and a heterostructure including a first light absorbing layer and at least a second light absorbing layer. A method for forming the solar cell can include forming a sacrificial layer on a support substrate and forming the barrier layer on the sacrificial layer. The barrier layer is formed to have a strain gradient through its thickness. The heterostructure is attached to the barrier layer and the sacrificial layer is removed, thereby separating the barrier layer and the heterostructure from the support substrate. During the removal of the sacrificial layer, the strain gradient causes the barrier layer and heterostructure, to roll, curl, or spiral, thereby resulting in a radially stacked heterostructure that provides a light concentrating optical cavity having multiple light absorbing layers with different band gaps.
3 Citations
10 Claims
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1. A method for fabricating a solar cell, comprising:
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forming a sacrificial layer; forming a barrier layer having a gradient strain on the sacrificial layer; attaching a heterostructure comprising a first light absorbing layer and at least a second light absorbing layer to the barrier layer, wherein the second light absorbing layer is attached to the first light absorbing layer and thereby forms a heterojunction at an interface between the first light absorbing layer and the second light absorbing layer; and removing the sacrificial layer subsequent to the attaching of the first light absorbing layer and the second light absorbing layer to the barrier layer, wherein the barrier layer, the first light absorbing layer, and the second light absorbing layer form a spiral structure having a spiral shape resulting from the gradient strain of the barrier layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification