Difference analysis between crystalline silicon battery and thin film battery

The working principle of photovoltaic power generation system
There are many types of solar photovoltaic power generation systems. Here, we will introduce the solar photovoltaic grid-connected large-scale ground power generation system as an example. The simplified photovoltaic power generation system is shown in Figure 1. It consists of solar cell arrays, grid-connected inverters, grid-connected protection devices, wiring and combiner boxes connecting these devices, meters installed on the AC side, step-up transformers, etc. constitute. The solar cells generate direct current, which is converted into alternating current by a grid-connected inverter and then integrated into the grid, which can be used together with the alternating current provided by the power company.

Polycrystalline silicon photovoltaic modules are composed of glass, EVA, cells, backplanes and panels (as shown in Figure 2). Due to the reasonable price and good performance of polysilicon modules, they occupy a relatively large share in the market.

At present, the conversion efficiency of polycrystalline silicon modules is about 15%, which is slightly lower than that of monocrystalline silicon products, but higher than that of amorphous silicon modules. Polycrystalline silicon cells have no photodegradation effect, and slight material quality differences will not cause solar cells to be affected. However, there is a certain difference in the single-chip power of polycrystalline silicon cells, and there is a certain difference in the power of modules with the same area (usually there is a difference of 20Wp-30Wp). Another advantage of polycrystalline silicon cells is that high and stable power generation performance can be obtained per unit area. The current nominal life of polysilicon modules is 25 years.
Silicon material is currently the dominant material for solar cells, and the silicon material used in amorphous silicon solar cells is about one percent of that of crystalline silicon cells, which greatly reduces the cost of raw materials. The double-junction silicon-based thin film module is composed of a glass substrate, a transparent conductive layer, a semiconductor layer, etc. (as shown in Figure 3). Double-junction silicon-based thin-film modules can be used in building-integrated applications, rooftops, and large-scale ground-based power stations. At present, the laboratory conversion efficiency of double-junction silicon-based thin-film modules has reached 15%, and the efficiency after mass production is about 10%.