Tsinghua University

Li-karn Wang

Yung-Hsien Wu

Feng-Der Chin

A process of manufacturing the interdigitated back-contact solar cell, with the use of screen printing or spraying and the use of chemical etching, forms the trenches for the P-type electrode on the back of the substrate for making the solar cell. The time-consuming process of photolithography (for example, at least two steps of high-temperature diffusion) can be avoided. Furthermore, only one machine for printing and etching is needed to form the structure of the interdigitated back-contact solar cell. The present invention can make the whole process time-efficient and low-cost to enhance the efficiency of the solar cell, fulfilling the demand of mass production.

Process of manufacturing an interdigitated back-contact solar cell

The present disclosure uses ammonia plasma for nitrification and for further forming a barrier pattern on a substrate. Then, a selective emitter is fabricated by forming light doping and heavy doping at one time through diffusion into the substrate. Therein, a plurality of trenches for obtaining a front contact is formed at the same time on forming the barrier pattern. Thus, the fabrication process is simplified and the cost is reduced for fabricating a selective emitter solar cell.

Growing community of inventors

Taipei, Taiwan

Li-karn Wang