Structural Innovation Of Colorful Solar Panel

- Sep 26, 2017-

     The concept of organic is seemingly new, but its history is not short-similar to the history of silicon-based solar cells. The first silicon-based solar cell was produced by Bell Labs in 1954, and its solar photovoltaic conversion efficiency was close to 6%, while the first organic photoelectric conversion device was prepared by Kearns and Calvin in 1958, the main material being magnesium phthalocyanine (MgPc) dyes, The dye layer is sandwiched between electrodes of two different power functions. On that device, they observed the open circuit voltage of the MV, the efficiency of photoelectric conversion is so low that people are embarrassed to mention.Colorful Solar Panel

     There are few innovations in the field of organic solar cells, and all reported devices are similar in structure to the 1958 edition, except for the use of various organic semiconductor materials between electrodes of two different power functions. The principle of such devices is shown in Fig. 1: Electrons in an organic semiconductor are stimulated from the Homo energy level to the Lumo energy level, producing a pair of electrons and cavities.Colorful Solar Panel

     The electrons are extracted by the electrodes of the low power function, and the holes are filled with electrons from the Gao Gong function electrodes, which form a light current under illumination. In theory, a different Schottky barrier is formed when the organic semiconductor film is in contact with the electrodes of two different power functions. This is the basis of the direct transmission of the light call charge. Thus the structure of the battery is often referred to as "Schottky type organic solar cells."Colorful Solar Panel

    The structure of the double-layer membrane heterogeneous organic solar cell is shown in Fig. 2. As the organic semiconductor material of the body absorbs photons, it produces a hole-electron pair, and the electrons are injected into the organic semiconductor material as a receptor, and the holes and electrons are separated. In this system, the electron-body is P-type, and the electron acceptor is n-type, thus the hole and electron are transmitted to two electrodes respectively to form a light current. Compared with the "Schottky" battery, this structure is characterized by the introduction of the mechanism of charge separation.Colorful Solar Panel

   Compared with silicon Semiconductor, the interaction between organic molecules is much weaker, and the Lumo and Homo between different molecules cannot form a continuous conduction band and valence band in the whole body phase. The transmission of carriers in organic semiconductors needs to be realized by the "jumping" mechanism of charge between different molecules, and the macroscopic performance is that its carrier mobility is much lower than that of inorganic semiconductors.Colorful Solar Panel