Analysis of performance parameters of solar polymer batteries

(1) Open circuit voltage (Voc): refers to the terminal voltage of the solar polymer battery when the current is zero in the case of an open circuit, and it is also the maximum voltage that the solar battery appears, usually in V. The open circuit voltage of the solar polymer battery is related to the light intensity, temperature and acceptor material, and it depends on the energy level difference between the HOMO energy of the donor and the LUMO energy of the acceptor: the energy between the HOMO energy and the LUMO energy of the acceptor Level difference formula Energy level difference between HOMO energy and acceptor LUMO energy (2) Short-circuit current (Jsc): Short-circuit current is the current that passes when the voltage and resistance are both zero, that is, the device does not have an external electric field bias Current is the maximum output current of the solar cell, in mA.cm. The important factors affecting the magnitude of the short-circuit current are: the absorption of sunlight by the active layer, the quantum efficiency of charge separation, the transport of carriers in the material, and the loss during the transport process. (3) Fill factor (FF): It means the ratio of the maximum power of the solar polymer battery to the product of the open circuit voltage and the short-circuit current. It illustrates the ability of the solar polymer battery to supply the maximum output power to the outside, and its meaning is : The ratio of the maximum power of the solar polymer battery to the product of the open circuit voltage and the short circuit current In the formula, Vmax refers to the maximum output voltage; Imax refers to the maximum output current; Pmax refers to the maximum output power. From the volt-ampere characteristic curve, we can see that FF is the ratio of the area of u200bu200bthe two rectangles in the figure, dimensionless, and the FF of an ideal solar cell is 1. The important factors affecting the size of the fill factor are: the contact resistance between the composite film and the electrode, the carrier mobility in the composite film, the thickness of the composite film, and the defects in the device! (4) Energy conversion efficiency (PCE): in solar energy In polymer batteries, the energy conversion efficiency (PCE) is one of its most important parameters. It means the ratio of the maximum output power to the incident light intensity Pin, that is: the ratio of the maximum output power to the incident light intensity Pin is from the above The formula shows that the energy conversion efficiency of solar polymer batteries is closely related to open circuit voltage, short circuit current, fill factor and light intensity. (5) External quantum efficiency (IPCE): External quantum efficiency is the ratio of the number of electrons appearing in the external circuit to the total number of incident photons. Its meaning is: external quantum efficiency is the ratio of the number of electrons appearing in the external circuit to the total number of incident photons. In the formula, Pin is the incident light power and input is the wavelength of incident monochromatic light. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the differences between 18650 batteries and soft-pack lithium batteries?