Active layer used for ternary blending solar cell and application of active layer

Abstract

The invention belongs to the technical field of organic photovoltaic devices or organic semiconductor film solar cells, and particularly relates to an active layer used for a ternary blending solar cell and application of the active layer. In the active layer, high-crystallinity P3HT serves as a donor, micromolecular DPP4T-Cz serves as a second donor, and a fullerene derivate PC61BM serves as an acceptor. Under the condition that the active layer is relatively thick, a good carrier transport capacity of the cell is ensured, the carrier recombination efficiency is reduced, a good exciton dissociation efficiency is obtained, and the optical absorption range is enpanded.

Description

technical field [0001] The invention belongs to the technical field of organic photovoltaic devices or organic semiconductor thin-film solar cells, and specifically relates to an active layer for a ternary blend solar cell and an application thereof. Background technique [0002] Binary organic solar cells with bicontinuous interpenetrating network structures have attracted extensive attention due to their light weight, low fabrication cost, and facile large-scale fabrication. At present, the photoelectric conversion efficiency (PCE) of organic solar cells has been increased to more than 10%, but compared with commercial inorganic silicon solar cells, the photoelectric conversion efficiency is still low. At present, the photoelectric conversion efficiency of binary organic solar cells is low. The main reasons are: first, the optical absorption range of the active layer does not match the ground solar radiation spectrum; second, the contradiction between the charge transport ...

AI Technical Summary

Problems solved by technology

It’s just that the introduction of the second donor in the active layer is considered to increase the absorption range of sunlight wavelength; at the same time, the thickness of the active layer of the current ternary organic solar cells is mostly limited to about 100nm. This is because the third The introduction of components can easily lead to carrier recombination, and a thicker active layer thickness will further increase the length of carrier transport to the electrode after exciton dissociation, increasing the recombination probability of carriers, which in turn leads to a higher fill factor. The degradation of photovoltaic performance

In other words, despite the improved optical absorption range compared to binary organic solar cells, the optical absorption efficiency has not been sufficiently optimized

On the other hand, the insufficient thickness of the active layer is not conducive to large-scale production using roll-to-roll technology

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