A heterojunction is the interface that occurs between two layers or regions of dissimilar crystalline semiconductors.
These semiconducting materials have unequal band gaps as opposed to a homojunction.
Silicon heterojunction technology (Si-HJT) is a popular topic in crystalline silicon photovoltaic as it allows for solar cells with energy conversion efficiencies above 20 %, even at industrial-production level. These solar cells consist of thin amorphous silicon layers on monocrystalline silicon wafers.
As of mid 2016, heterojunction cells are still predominantly in research and pilot stages and are not deployed commercially on a large scale anywhere in the world.
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