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The working principle of solar energy storage polymer lithium battery

Time:2021-01-11 Views:277

  The working principle of the solar energy storage polymer lithium battery, when photons with suitable energy are irradiated on the photosensitive active layer through ITO glass, the donor or acceptor material on the photosensitive active layer absorbs the photons to generate excitons, and then the excitons diffuse to The donor/acceptor interface and the charge separation occurs there, thereby generating holes on the donor and electrons on the acceptor, and then the holes are transferred along the donor to the anode and collected by the anode, and the electrons are transferred along the acceptor to the cathode It is collected by the cathode, and finally generates photocurrent and photovoltage.

The working principle of solar energy storage polymer lithium battery

  The light absorption properties of the donor and acceptor materials, the hole mobility of the donor, the electron mobility of the acceptor, and the position of its highest occupied orbital (HOMO) and lowest unoccupied orbital (LLUMO) energy levels on the performance of organic photovoltaic devices Has a very important impact. For electronic energy levels, the donor material should have relatively high LUMO and HOMO energy levels, while the acceptor material should have lower LUMO and HOMO energy levels, so as to ensure that the donor/acceptor interface, The electrons of excitons in the body at the LUMO energy level can be spontaneously transferred to the LUMO energy level of the acceptor, and the holes of the excitons in the acceptor at the HOMO energy level can be spontaneously transferred to the HOMo energy level of the donor. So as to realize the separation of charge.

  In short, the photoelectric conversion of polymer solar cells can be simplified into the following 4 processes:

  The working principle of solar energy storage polymer lithium battery

  Working mechanism diagram of solar polymer battery

  (1) The donor is excited by light to produce excitons,

  (2) Excitons diffuse to the D/A interface

  (3) The excitons separate at the D/A interface to form an electron-hole pair

  (4) Free carriers are transported and collected at the external electrode.

  The structure of the solar polymer battery

  The structure of the solar polymer battery

  As shown in Figure 1.2: The composition of the bulk heterojunction polymer solar cell device: the lower layer is ITO glass as the positive electrode, the upper layer is Ca/A1 and other metal electrodes as the negative electrode, and the middle is made of copolymer donor materials and fullerene The blend film of the derivative (PCBM) acceptor material serves as the photoactive layer. Among them, the structure of the conjugated polymer has a key influence on the efficiency of polymer solar cells.


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