Abstract: Silicon-crystalline solar cells, like LEDs, are also composed of PN junctions, and the lighting system they make up should be more meaningful "semiconductor green illumination." This paper proposes that semiconductor green lighting should be the task of the entire semiconductor industry. Standing at such a new height to examine the real green lighting system of the future human being, it should be: solar cell - LED, PN junction - PN junction semiconductor green lighting system. It has the advantages that any lighting system in the world can't match: clean, no pollution, high efficiency and long life.
Keywords: PN junction solar cell LED OLED
1 People's understanding of semiconductor green lighting
In recent years, due to the rapid development of LED technology and the worldwide energy shortage, the concept of "semiconductor green lighting" has been accepted by more and more people. In 2004, the National Semiconductor Lighting Engineering Coordination Leading Group was announced. The Ministry of Science and Technology and the Ministry of Information Industry, the Ministry of Construction, the Ministry of Education, the China Light Industry Association, and the Chinese Academy of Sciences began to jointly launch semiconductor lighting projects.
Internationally, General Electric, Philips, and OSRAM have joined forces with semiconductor companies to establish semiconductor lighting companies. The United States "laser world" once wrote that by 2025 white LED will account for more than 25% of the lighting market. Industry insiders expect the global LED lighting market to exceed $1 billion in 2005-2010. There are also reports abroad that semiconductor lamps replace 20% of incandescent lamps after five years. This estimate may be optimistic, but reveals the future application prospects and growth potential of semiconductor lamps. According to statistics: If 25% of incandescent lamps and all fluorescent lamps in Taiwan are replaced by white LEDs, they can save 11 billion kWh of electricity per year, which is equivalent to the power supply capacity of a nuclear power plant. Since lighting consumption accounts for 20% of the total electricity consumption, and the annual energy saved by using this kind of light source reaches 100 billion US dollars worldwide, vigorous development of white LED technology will be an effective way to protect the environment and save energy. The use of solid-state lighting over the next two decades will reduce global electricity use for lighting by 50% and save global electricity consumption by 10% [1].
"Semiconductor green lighting" is LED lighting, which is the current understanding of "semiconductor green lighting."
2 Solar cells, like LEDs, are semiconductor devices
In recent years, solar cell technology has been developed at the same time as LED technology. Although there are many types of solar cells, in the field of photovoltaic power generation, due to the relatively superior service life and conversion efficiency of crystalline silicon solar cells, they have taken the lead. It is a crystalline silicon solar cell. At present, the solar cell is basically a silicon crystal solar cell.
A silicon-crystalline solar cell is another semiconductor device. Like an LED, it is also composed of a PN junction, which is a PN junction that is several thousand times or even tens of thousands of times larger than an LED. Its life span can reach more than 25 years, the source of raw materials is rich, the reliability is high, and the work is noise-free. Solar energy is a semiconductor device as a green energy source from solar energy. It is simple in structure and long in life. It is an inexhaustible source of energy and the most promising energy source of this century. At present, due to the high price of solar cells, or because of the low efficiency of solar cells, the small power per unit area, and the lack of suitable locations for solar cells, these problems may be solved at that time. Like LED technology, the development of solar cells has also encountered some temporary technical problems. Recalling that humans made modern silicon solar cells in 1954, they were used in spacecraft in 1958, and the design of space solar cells in the early 1960s was mature. For the next ten years, solar cells are mainly used in space. In the 1970s, the conversion efficiency of solar cells has been significantly improved. By the end of the 1970s, due to the decline in manufacturing costs, the number of solar cells used in the ground has exceeded the number of space applications. Since the 1980s, the efficiency of crystalline silicon solar cells has increased from 18% to 25%. That is to say, it is entirely possible that humans' main power will come from solar cells in the future.