Back contact silicon heterojunction solar cell without interface doping and preparation method thereof

The invention provides a back contact silicon heterojunction solar cell without interface doping and a preparation method thereof. The battery comprises a substrate layer, a passivation layer, an electronic shell, a hole layer, a cathode electrode and an anode electrode, wherein the substrate layer is provided with a first surface and a second surface which are opposite, and the first surface is an uneven surface; the passivation layer is stacked on the first surface; the electronic shell and the hole layer are stacked on the second surface and are arranged at an interval; the cathode electrode is stacked on the electronic shell and the anode electrode is stacked on the hole layer. The battery adopts an n type or a P type silicon wafer as a substrate and takes aluminum oxide as the passivation layer, the high temperature is not needed during preparation, the energy consumption is greatly reduced in a preparation process, the cost is saved, and the obtained battery has the characteristics of stable structure, excellent quality and the like.