Organic polymer solar cells

In organic / polymer materials with photon - electron interaction very strong, so kind of materials and inorganic materials, different photophysical principles, people do not understand everything.

One of the main difference is in the organic / polymer materials, the photon excitation is not a free carrier, but bound together the stimulated electron - hole pairs, exciton binding energy of about 0.4eV. Carrier transport in the free and to be collected before the electrode, exciton dissociation required for the electrons and holes. For example, in the single exciton dissociation interface rectifier device or in an electronic donor (D) and electron acceptor (A) semiconductor interface dissociation. Lenovo Ideapad Y650 battery The interface area of greater reach and exciton dissociation the more. In addition, compared with the thickness, the exciton diffusion distance is small (typically about 10nm), so the organic / polymer solar cells is to absorb most of the sun than 100nm and obtained satisfactory photoelectric conversion efficiency is difficult.