Two-step processed efficient perovskite solar cells via improving perovskite/PTAA interface using solvent engineering in PbI2 precursor

doi:10.1088/1674-1056/ab7744

Abstract The morphology and interface of perovskite film are very important for the performance of perovskite solar cells (PSCs). The quality of perovskite film, fabricated via two-step spin-coating process, is significantly influenced by the morphology and crystallinity of PbI₂ film. With the addition of additive dimethyl sulfoxide (DMSO) into the PbI₂ precursor, the roughness and trap-state density of perovskite film have been significantly reduced, leading to the excellent contact between perovskite layer and subsequent deposited carrier transport layer. Accordingly, the planar heterojunction PSCs with an architecture of ITO/SnO₂/perovskite/PTAA/Ag show an efficiency up to 19.02%. Furthermore, PSCs exhibit promising stability in air with a humidity of ～ 45%, and retain 80% of initial efficiency after being exposed to air for 400 h without any encapsulation.

Keywords: perovskite solar cells planar heterojunction interface PbI₂-DMSO complex

Received: 10 January 2020
Revised: 23 January 2020
Accepted manuscript online:

PACS:	88.40.H-	(Solar cells (photovoltaics))
	88.40.hj	(Efficiency and performance of solar cells)
	88.40.ff	(Performance testing)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51673214) and the National Key Research and Development Program of China (Grant No. 2017YFA0206600).

Corresponding Authors: Jun-Liang Yang
E-mail: junliang.yang@csu.edu.cn

Cite this article:

Cao-Yu Long(龙操玉), Ning Wang(王宁), Ke-Qing Huang(黄可卿), Heng-Yue Li(李恒月), Biao Liu(刘标), Jun-Liang Yang(阳军亮) Two-step processed efficient perovskite solar cells via improving perovskite/PTAA interface using solvent engineering in PbI₂ precursor 2020 Chin. Phys. B 29 048801

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Two-step processed efficient perovskite solar cells via improving perovskite/PTAA interface using solvent engineering in PbI2 precursor

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Two-step processed efficient perovskite solar cells via improving perovskite/PTAA interface using solvent engineering in PbI₂ precursor