NPN-structure-based laser photovoltaic cell and preparation process thereof

Abstract

The invention relates to an NPN-structure-based laser photovoltaic cell and a preparation process thereof. The photovoltaic cell comprises an N type GaAs conducting layer, a tunneling junction and a GaAs cell which are sequentially grown on a semi-insulating GaAs substrate, wherein the GaAs cell comprises a P / N junction and an N type window layer which are sequentially distributed in the direction gradually far away from the substrate. The preparation process comprises the following steps of: sequentially growing the N type conducting layer, the tunneling junction, the P / N junction, the N type window layer and an N type contact layer on the semi-insulating substrate by an epitaxial growing method to form a photovoltaic cell base body; and processing on the photovoltaic cell base body to form an isolating groove, a positive electrode, a negative electrode, an antireflection layer and an electrode lead to form the target product. The photovoltaic cell is low in series resistance, high in output voltage and high in light absorption and light conversion efficiency, can widely serve as a high-efficiency laser photovoltaic cell and is easy and convenient to prepare. The processing time of a device can be effectively saved; the cost is reduced; and the requirement of mass production is met.

Description

technical field [0001] The present invention relates to a method for manufacturing a high-efficiency laser photovoltaic cell based on an NPN structure, in particular to a high-efficiency laser photovoltaic cell, especially a photoelectric cell with a GaAs homogeneous PN junction as a photoelectric conversion layer on a semi-insulating GaAs substrate and its preparation method. Background technique [0002] Laser energy supply systems have important applications in the power supply of electronic systems in environments where stable power supply or need to avoid electric sparks are required in outdoor remote electronic systems such as smart grids, communication systems in remote areas, medical systems, industrial sensors, and aircraft fuel tank monitoring. The laser energy supply uses a high-power semiconductor laser light source, which transmits the light energy to the remote harsh environment that needs power supply through an optical fiber, and then uses a laser battery to ...

AI Technical Summary

Problems solved by technology

At present, the method of increasing the thickness or doping concentration of the P-type window layer and the P-type absorbing layer is mainly used to reduce the series resistance of the battery, but this will increase the material growth time, thereby greatly increasing the manufacturing cost.

Images