the roadmap for silicon solar cell development calls for the introduction of passivating contacts to the mainstream high-volume production of PV devices, then a possible switch to n-type material and finally the introduction of tandem cells. Below we describe challenges for the different technology classes.
What are the different types of photovoltaic technology?
There are four main categories that are described as the generations of photovoltaic technology for the last few decades, since the invention of solar cells : First Generation: This category includes photovoltaic cell technologies based on monocrystalline and polycrystalline silicon and gallium arsenide (GaAs).
What are some breakthroughs in photovoltaic cells?
Breakthroughs in the production of these cells include the introduction of an aluminum back surface field (Al-BSF) to reduce the recombination rate on the back surface, or the development of Passivated Emitter and Rear Cell (PERC) technology to further reduce the recombination rate on the back surface 3. Second Generation of Photovoltaic Cells
Third Generation: This generation counts photovoltaic technologies that are based on more recent chemical compounds. In addition, technologies using nanocrystalline “films,” quantum dots, dye-sensitized solar cells, solar cells based on organic polymers, etc., also belong to this generation.
What drives the growth of photovoltaics?
The exponential growth of photovoltaics from small manufac-turers to today's fully automated 150 GW industry was mainly driven by crystalline silicon solar cells.
Due to their relatively high efficiency, they are the most commonly used cells. The first generation of photovoltaic cells includes materials based on thick crystalline layers composed of Si silicon. This generation is based on mono-, poly-, and multicrystalline silicon, as well as single III-V junctions (GaAs) .
What is a photovoltaic energy system?
When we discuss solar energy, we can envision a complete photovoltaic energy system comprised of three subsystems. On the power generation side, sunlight is converted to direct current (DC) electricity via a photovoltaic subsystem (solar cells, photovoltaic modules, and arrays).