The Solar LED lighting is a practical knowledge website that organically combines the design of LED solar lighting system with lighting technologies engineering application
People have understood the basic knowledge that semiconductor materials can produce light 50 years ago, and the first commercial diode was produced in 1960. The structure of LED is mainly composed of PN junction chip, electrode and optical system. When a forward bias is applied to the electrode, electrons and holes are injected into the…
The output characteristic curve of the solar cell module is shown as in Figure 1. It can be seen from Figure 1 that the volt-ampere characteristics of solar cells have strong nonlinearity, that is, when the sunlight intensity changes, the open circuit voltage will not change much, but the maximum current generated will change considerably….
Only a small part of the light energy projected on the entire illuminated surface of the solar cell can be turned into electrical energy, because it is affected by many factors. The radiation of sunlight in outer space is basically constant, but after being absorbed by the atmosphere with different composition and thickness (It includes the…
A silicon atom has 14 electrons, which are distributed on three electron layers. The two electron layers inside have been filled, and only the outermost layer lacks four electrons to be half full. In order to achieve a stable structure of the full-electron layer, each silicon atom can only combine with its four adjacent atoms to…
1. PN junction energy band and contact electromotive force difference Under thermal equilibrium conditions, the junction area has a unified EF; in the part far away from the junction area, the relationship between EC, EF, and EV is the same as the state before the junction is formed. From the PN junction model and energy…
Solar cells are devices that use the principle of photoelectric conversion to convert solar radiation light into electrical energy through semiconductor materials. This photoelectric conversion process is usually called the “photovoltaic effect.” The photovoltaic effect is abbreviated as the photovoltaic effect, which refers to the phenomenon that light causes a potential difference between different parts…
When a voltage is applied to the two ends of a semiconductor, the valence electron superimposes the directional motion caused by the electric field on the basis of the irregular thermal motion, forming a current, and its motion state also changes, so its motion energy It must be different from the original thermal exercise. In…
Matter is made up of atoms, and objects made up of atoms repeatedly arranged in a certain period are called crystals. When atoms combine to form a crystal, because the distance between atoms is very close, the electron orbits (quantum states) between different atoms will overlap to different degrees. Of course, the orbits of the…
There are all kinds of substances in nature, and they can be gases, liquids or solids. According to the arrangement of its atoms, solids can be divided into two types: crystalline and amorphous. According to the conductivity, they can be divided into three types: conductors, insulators, and semiconductors between the two. The resistivity of different…
In 1664, Newton used a shuttle lens to disperse the white sunlight into a spectrum of different tones, laying the physical foundation of light color. In 1860, Maxwell used different intensities of red, yellow, and green light to match white light to various colors. The light of color laid the foundation of trichromatic colorimetry. On…