INVESTIGATION OF POST-TREATMENT VIA TRI-IODINE IONS FOR PEROVSKITE SOLAR CELLS

Li Xingyu; Dong Haiyue; Xia Tian; Liu Weiting; Yao Disheng; Long Fei

doi:10.19912/j.0254-0096.tynxb.2021-1303

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (3) : 409-414. DOI: 10.19912/j.0254-0096.tynxb.2021-1303

INVESTIGATION OF POST-TREATMENT VIA TRI-IODINE IONS FOR PEROVSKITE SOLAR CELLS

Li Xingyu¹, Dong Haiyue¹, Xia Tian¹, Liu Weiting¹, Yao Disheng^1,2, Long Fei^1~3

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Abstract

Tri-iodine anion I₃^- is employed as a defect passivator for post-treatment to as-prepared perovskite films, which remarkably improves the interfacial contact between the light-absorbing and the hole transport layer. This strategy on defects is found to significantly enhance power conversion efficiency of planar heterojunction devices to 18.9% by a one-step film deposition method. Meanwhile, the operational stability of PSCs is effectively improved that an efficiency decline of only 5% is observed in the I₃^--treated device after aging for 600 hours. The film morphology, optoelectrical properties, and the effect and mechanism of I₃^- with different concentrations on the device performance are investigated by measurement of phase and optoelectronic. The results show that the defect passivation strategy with post-treatment of I₃^- can benefit preferential growth orientation of the perovskite crystals, reduce trap-state defects, and eliminate the potential energy barrier between the perovskite and the hole transport layer. Furthermore, I₃^- is helpful to form an in-situ protecting layer which prevents the perovskite material from moisture and oxygen attacks.

Key words

perovskite solar cells / defect passivation / anti-solvent / interface modification / tri-iodine ions / post-treatment / stability

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Li Xingyu, Dong Haiyue, Xia Tian, Liu Weiting, Yao Disheng, Long Fei. INVESTIGATION OF POST-TREATMENT VIA TRI-IODINE IONS FOR PEROVSKITE SOLAR CELLS[J]. Acta Energiae Solaris Sinica. 2023, 44(3): 409-414 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1303

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