| abstract |
The invention relates to the field of photovoltaics, and specifically discloses an electron transport material, which includes a compound of the following general formula: Wherein, the ring F represents a fullerene; R represents the following substituents: n1 is selected from 1 to 2; R2 represents the following substituents: ‑NH‑CH 2 ‑CH 2 ‑NR' 2 , ‑NH‑CH 2 ‑CH 2 ‑OR';R' represents H or C 1 ‑C 3 alkane groups ; n2 is selected from 1-4. The above-mentioned electron transport material not only has the function of electron transport, but also has the dual function of passivation of the perovskite layer. It can enhance the curing effect of halogen elements in the perovskite layer, which can not only reduce the defect state of the perovskite layer, but also improve the stability of the perovskite layer; at the same time, it can better block holes and prevent the photogenesis of the perovskite layer. The holes recombine with the electrons in the electron transport layer, which improves the contact with the perovskite layer, which is beneficial to the stability of the perovskite solar cell, and then also helps to improve the photoelectric conversion efficiency. The invention also provides a preparation method of the electron transport material and a perovskite solar cell. |