Solar cell emitter region fabrication with differentiated P-type and N-type architectures and incorporating a multi-purpose passivation and contact layer

• Main Authors: Rim, Seung Bum, Westerberg, Staffan
• Format: Patent
• Language: English
• Published: 27.08.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; SEMICONDUCTOR DEVICES

Methods of fabricating solar cell emitter regions with differentiated P-type and N-type architectures and incorporating a multi-purpose passivation and contact layer, and resulting solar cells, are described. In an example, a solar cell includes a substrate having a light-receiving surface and a back surface. A P-type emitter region is disposed on the back surface of the substrate. An N-type emitter region is disposed in a trench formed in the back surface of the substrate. An N-type passivation layer is disposed on the N-type emitter region. A first conductive contact structure is electrically connected to the P-type emitter region. A second conductive contact structure is electrically connected to the N-type emitter region and is in direct contact with the N-type passivation layer.