Synthesis and Performance Research of D-A-D Type Transport Materials Applied in Perovskite Solar Cells

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Abstract The efficiency and stability of perovskite solar cells are huge challenges in the developing process. Therefore, it is an effective way to improve the efficiency and stability of perovskite solar cells by introducing additives, passivators, protective layers, etc. between the perovskite layer and the hole transport layer to improve the interface transport and suppress the combination of electrons and holes. In this study, a cis D-A-D type (Donor-Acceptor-Donor) triphenylamine azo compound (TPA)₂Ab with higher carrier mobility was reported, which is used as a transport layer between the perovskite layer and the Spiro-OMeTAD layer, labeled as charge separation layer (CSL). The introduction of the charge separation layer effectively increases the transport of holes, inhibits carrier recombination, and passivates the traps on the surface of the perovskite; hydrogen iodide was doped into (TPA)₂Ab to improve the perovskite layer surface topography and reduce transmission resistance. Compared with the reference cell without charge separation layer, it is found that the efficiency of the perovskite solar cell modified with the charge separation layer has an increase of nearly 14%, increased from 14.24% to 16.14%. At the same time, the charge separation layer can weaken the decomposition of the perovskite layer by water and oxygen, so the stability of the cell is also significantly improved, and the retention rate of the cell with the best efficiency reaches 85.69% after 10 days.

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	Articles by authors
	Geng Ruilin
	Feng Wenhui
	Thomas T. Testoff
	Liu Dongzhi
	Wang Tianyang
	Li Wei
	Wang Lichang
	Zhou Xueqin

Keywords： triphenylamine； Azo； synthesis； perovskite device； interface modification

Received 2020-07-29;

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Geng Ruilin, Feng Wenhui, Thomas T. Testoff, Liu Dongzhi, Wang Tianyang, Li Wei, Wang Lichang, Zhou Xueqin.Synthesis and Performance Research of D-A-D Type Transport Materials Applied in Perovskite Solar Cells[J] Chemcial Industry and Engineering, 2021,V38(4): 13-24

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