New energy principle of solar photovoltaic power generation is what?

Photovoltaic effect will occur in the liquid and solid substances, but only the solid ( Especially the semiconductor PN junction device) Under the sun of the photoelectric conversion efficiency is higher. Using the photovoltaic effect principle made from crystalline silicon solar cells, the light of the sun can be

in liquid and solid substances are present in the photoelectric effect, but only the solid ( Especially the semiconductor PN junction device) With high photoelectric conversion efficiency in the sun. Using the photovoltaic effect principle made of crystalline silicon solar cells can convert solar energy into electrical energy directly. Solar photovoltaic energy converter is solar cells, also called a photovoltaic cell, is the basis of the solar photovoltaic power generation systems and core components. Convert solar energy into electrical energy process mainly includes three steps: ( 1) Solar cells to absorb certain after the photon energy, in the form of empty hole to produce in the semiconductor electronics, this is known as a 'carrier'. The opposite polarity, electronic negatively charged, and empty hole positively charged. ( 2) Opposite polarity photoproduction carrier by semiconductor PN junction of electrostatic field to separate. ( 3) The positive and negative electrodes of solar cells were collected photoproduction current-carrying electrons and holes is empty and generate electricity current in an external circuit. The principle of solar photovoltaic power generation as shown in the figure below. When light to the surface of the solar cell, some photons is absorbed by silicone material, and the photon energy is transferred to the silicon atoms, electrons into free electrons, the free electrons to form potential difference on both sides of the gathered at the p-n junction. When the external circuit, in under the action of the voltage, electric current will flow through an external circuit to generate certain output power. This process is the essence of the photon energy into electrical energy. In solar power generation system, the system overall efficiency of the eta by photoelectric conversion efficiency of solar cell module, controller, inverter, battery efficiency efficiency, load efficiency, etc. At present, the photoelectric conversion efficiency of solar cell is only about 17%. Therefore, to improve the photoelectric conversion efficiency of solar cell components, reduce the cost of the unit power of the solar photovoltaic power generation system is the key and difficult point for industrialization of solar photovoltaic power generation. Since the advent of solar cells, crystalline silicon as the main material has maintained the leading position. At present, the research of silicon solar cell conversion efficiency are mainly concentrated on the surface to increase energy absorption ( If use double batteries to reduce reflection) Absorbing impurities, the use of technology and passivation technology improve the conversion efficiency of silicon solar cell, and make a battery around. At present, solar photovoltaic power generation system is mainly used in the following three aspects. ( 1) Power supply for the electricity situations, mainly for the majority of the electricity in people's life and production, microwave relay station and mobile phone base stations and other power supply. ( 2) Solar daily electronic products, such as all kinds of solar charger, solar street lights and solar lawn. ( 3) Connected to the grid, that is, access to the national grid. China's photovoltaic (pv) grid power generation has been very mature. Since 2013, the state has staged a series of policies, promote photovoltaic encourage conditional area industrial and commercial and residential and public building construction of photovoltaic power generation facilities.