BIFACIAL P-TYPE PERC SOLAR CELL AND MODULE, SYSTEM, AND PREPARATION METHOD THEREOF

摘要

Provided are a bifacial P-type PERC solar cell, preparation method, module and system. The bifacial P-type PERC solar cell consecutively comprises a rear silver electrode (1), rear aluminum grid lines (2), a rear passivation layer (3), P-type silicon (4), an N-type emitter (5), a front silicon nitride film (6), and a front silver electrode (7); the rear silver electrode (1) is perpendicularly connected with the rear aluminum grid lines (2), grid line backbones (10) are disposed on the rear aluminum grid lines (2), an outer aluminum grid frame (9) is disposed around the rear aluminum grid lines (2), the grid line backbones (10) are connected with the rear aluminum grid lines (2), and the outer aluminum grid frame (9) is connected with the rear aluminum grid lines (2) and the rear silver electrode (1); a first laser grooving region (8) is formed in the rear passivation layer (3) with laser grooving, and the rear aluminum grid lines (2) are connected to the P-type silicon (4) via the first laser grooving region (8); the first laser grooving region (8) includes a plurality of sets of first laser grooving units (81) arranged horizontally, each of the sets of first laser grooving units (81) includes one or more first laser grooving bodies (82) arranged horizontally, and the rear aluminum grid lines (2) are perpendicular to the first laser grooving bodies (82). The solar cell is simple in structure, low in cost and easy to popularize, and has a high photoelectric conversion efficiency.