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Core principles and structure
1. Optoelectronic effect:When photons collide with a silicon semiconductor (PN junction), photons with sufficient energy excite electrons into free electrons, forming electron hole pairs.
The built-in electric field of PN junction pushes electrons to N-type semiconductor and holes to P-type semiconductor, generating voltage and current.
2. Key components:Material: The mainstream is crystalline silicon (single crystal silicon efficiency of 21%+, slightly lower efficiency for polycrystalline silicon), and new technologies such as perovskite (theoretical efficiency of 33%) are still in the research and development stage.
Structure: Multiple battery cells are connected in series/parallel, covered with conductive layers (such as tin oxide) and metal grids to collect current.
Crystalline silicon technology:Monocrystalline silicon: high conversion efficiency (21.5%+), high cost, circular silicon rod process.
Polycrystalline silicon: slightly lower efficiency, square silicon ingot process, lower cost.
N-type vs P-type batteries:N-type: doped with phosphorus/arsenic, with an efficiency of 22%+and stronger anti-aging properties.
P-type: doped with boron/gallium, with an efficiency of about 21.5%, currently the mainstream in the market.
Application scenarios: including household power generation systems (equipped with solar controllers for charge and discharge protection), large-scale photovoltaic power stations, etc.
Limitations: Silicon materials have high manufacturing costs, and new technologies such as perovskite need to address efficiency degradation issues.
Future development direction: Improve photoelectric conversion efficiency, reduce material costs, and promote the commercialization of advanced technologies such as PERC and TOPCon.
