A heterojunction is an 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.
You Might Want to Check Out these Questions Too on Types of Solar Panels
- What is a Crystalline Silicon/c-Si Solar Cell/Module?-Here
- How do Monocrystalline Solar Panels Compare with Polycrystalline Solar Panels?-Here
- What is an Amorphous Silicon (a-Si) Solar Module? Is it Used Now?-Here
- What are CdTe (Cadmium Telluride ) Thin Film Solar Cells? Are These Commercially Available?-Here
- What are CIGS (Copper Indium Gallium Selenide) Thin Film Solar Cells? Are These Available Commercially Today?-Here
- What is a CIS Solar Module? Are These Commercially Available Today?-Here
- What are Bifacial Solar Cells? Are they Commercially Available?-Here
- What are Concentrating Photovoltaics (CPV)? What are their Benefits?-Here
- What Single-junction Solar Cells? How are they Different from Conventional Solar Cells?-Here
- What is a Tandem Solar Cell? How is it Different from the Conventional Solar Cell?-Here
- What is a Transparent Solar Cell? And What are Its Advantages Over Conventional Cells?-Here
- What is the Smallest Sized Solar Panel Available Currently?-Here
- What is the Largest Capacity/Size Solar Panel Currently?-Here
- What are n-type Solar Cells? And how are they Different from p-type Cells?-Here
- What are Multi-junction Solar Cells? How are They Different from Conventional Solar Cells?-Here