Photovoltaic effect of the PN junction. The principle of folding solar panels in series to increase the voltage is based on the photovoltaic effect of the PN junction. This effect involves three main physical processes: first, the semiconductor material is irradiated by light to generate non-equilibrium electron-hole pairs; second, the generated non-equilibrium electron-hole pairs diffuse or drift toward the PN junction. moves ; third, after entering the space charge region, a photogenerated electric field is generated, opposite to the built-in electric field.
The self-made foldable solar package is suitable for 5W to 20W. The power of the battery board can be selected between 5V, 5W and 20W. The minimum configuration is to configure a 5W or more battery card. You can also configure 10W or 20W battery board, and the charging current will be higher. The foldable bag solaire converts solar energy into electrical energy via solar panels to charge digital products. It has the advantages of being foldable and portable. The foldable bag has considerable advantages in terms of weight and size.