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Advanced functional materials: a new perovskite solar cell electron transport layer material with more than 22% efficiency and long-term stability

wallpapers News 2020-08-02
At present most of the high efficiency perovskite solar cells of

adopt n-i-p CIS structure based on SnO2 electron transport layer. Compared with the traditional titanium dioxide (TiO2) electron transport layer SnO2 has many advantages such as higher electron mobility fewer defect states better photochemical stability of contact interface with perovskite. However n-i-p perovskite solar cells based on pure phase SnO2 electron transport layer still have some disadvantages such as hysteresis of J-V curve many defects in SnO2 / perovskite interface poor stability. In order to overcome these problems improve battery performance researchers usually adopt the strategy of interface treatment on SnO2 layer. Different from this Professor Chen Chong's research group has been looking for a new material which is more suitable than SnO2 as electron transport layer to further improve the performance stability of the battery.

to solve this problem a new type of electron transport material (CH3) 2Sn (COOH) 2 (CSCO) was synthesized to replace SnO2 which significantly improved the performance stability of perovskite solar cells.

study found that: on the one h compared with SnO2 film the newly synthesized CSCO film has higher conductivity which is mainly due to the hybridization of p orbitals of C atom O atom in CSCO which makes the π - π conjugated base of - o = c-o-group more delocalized which effectively promotes the electron transport in CSCO; on the other h the O atom in CSCO film occurs with Pb atom in perovskite material At the same time the SN atom energy in CSCO the halogen anion in perovskite have strong bond cooperation which can effectively reduce the defects caused by the lack of halogen anion. These two functions effectively passivate the perovskite trapped state promote the chemical stability of perovskite materials. Due to the above positive factors the photoelectric conversion efficiency of the cell based on CSCO electron transport layer is significantly improved compared with that of the cell based on SnO2 electron transport layer the efficiency is increased from 18.5% to more than 22% the device stability is also significantly improved. After 130 days in the atmosphere the photoelectric conversion efficiency of the battery remained at 83% of the initial efficiency. The research results provide new electron transport materials research ideas for the realization of high efficiency high stability of perovskite solar cells.

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