Polymorph: Crystal particles are small and the same volume corresponds to more particles.
Single crystal: crystal particles are large, the same volume corresponds to less particles.
(Note: because the free electrons will be in the crystal grain boundary complex, back to the bound state, can no longer contribute to the current, so the smaller particles, the same volume corresponds to more particles, electronic recombination more frequent, so the battery efficiency is lower Single crystal battery.
N type: elements of the periodic table in the fourth group of silicon is mixed with the fifth group of phosphorus, more free to move the electron, was negative polarity.
P-type: elements of the periodic table in the fourth group of silicon is mixed with the third group of boron, less free to move the electron, was positive polarity.
(Note: The material properties determine that the free electrons are more likely to be compounded in the p-type material to the bound state, so the n-type material makes the battery efficient.)
Aluminum back: the back of the battery coated with aluminum, penetrate into the silicon material, the formation of local electric field, blocking the free electrons back to the surface compound.
The common characteristics of the three types of back passivation (PERC / PERL / PERT) structures are the addition of passivation layers on the basis of traditional aluminum backfields to better block electrons on the back surface. PERL and PERT are enhanced versions of PERC because of the heavy diffusion (partial or total) and the same polarity of the wafer after the passivation layer, forming another back electric field.
Heterosejunction: There are both crystalline and amorphous silicon in the cell; the appearance of amorphous silicon is better achieved with the passivation effect.
· Back electrode: the positive and negative electrodes are placed on the back of the battery, there is no front electrode part (silver) reflect a part of the incident light and the shadow loss.
Theoretically, the definitions of Table 1 and Table 2 are based on different standards, and various combinations can be used, but in the actual preparation process, some of the battery structure corresponding to the high cost of production, the need to use a better silicon to make more efficient Battery to support its economy.