Metal-semiconductor contact structure and preparation method therefor, solar cell, solar cell string and preparation method therefor, and photovoltaic module

A metal-semiconductor contact structure comprising:

• a doped silicon-based semiconductor layer;
• and a metal electrode, wherein the metal electrode and the doped silicon-based semiconductor layer are in contact with each other, and the metal electrode has a metal element;
• wherein, a contact region is provided between the doped silicon-based semiconductor layer and the metal electrode, and the contact region comprises a first conductive region and a second conductive region located outside the first conductive region;
• in the first conductive region, the metal electrode is recessed towards an inner direction of the doped silicon-based semiconductor layer to form a pit island, a silicon-based eutectic is provided in the pit island, the silicon-based eutectic is in conductive connection with the doped silicon-based semiconductor layer, and a conductive crystal in conductive connection with the silicon-based eutectic is further provided in the first conductive region, and the silicon-based eutectic comprises a eutectic formed by co-crystallization of a silicon element and the metal element;
• a conductive aggregate is provided in the second conductive region, the conductive aggregate comprises a glass phase material and metal conductive particles, and the metal conductive particles have a same kind of the metal element as the conductive crystal.