Importance of PbI2 morphology in two-step deposition of CH3NH3PbI3 for high-performance perovskite solar cells

doi:10.1088/1674-1056/26/12/128801

Abstract Controlling the morphology of the perovskite film is an effective way to improve the photoelectric conversion efficiency of solar cell devices. In this work, we study the influence of the crystallization condition on PbI₂ morphology and the performances of resulting perovskite solar cells. The PbI₂ morphologies and coverage rates under different formation conditions such as solvent effect, slow crystallization at room temperature and substrate-preheating, are found to be of crucial importance for preparing high-quality perovskite. The generation of loosely packed disk-like PbI₂ film with interpenetrating nanopores promotes the penetration of methyl ammonium iodide (MAI), leading to a better crystallinity of the perovskite film, and a best repeatable power conversion efficiency of 11.59% is achieved when methyl ammonium lead triiodide (CH₃NH₃PbI₃, MAPbI₃) is employed. In addition, an excellent device is also obtained with an efficiency of more than 93% to remain after working for 43 days.

Keywords: morphology PbI₂ solution perovskite solar cells crystallization

Received: 26 June 2017
Revised: 23 August 2017
Accepted manuscript online:

PACS:	88.40.hj	(Efficiency and performance of solar cells)
	84.60.Jt	(Photoelectric conversion)
	78.56.-a	(Photoconduction and photovoltaic effects)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61404007) and the Beijing Talents Fund, China (Grant No. 2015000021223ZK38).

Corresponding Authors: Yang Tang
E-mail: tangy118@hotmail.com

Cite this article:

Hui Wei(韦慧), Yang Tang(汤洋), Bo Feng(冯波), Hui You(尤晖) Importance of PbI₂ morphology in two-step deposition of CH₃NH₃PbI₃ for high-performance perovskite solar cells 2017 Chin. Phys. B 26 128801

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Importance of PbI2 morphology in two-step deposition of CH3NH3PbI3 for high-performance perovskite solar cells

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Importance of PbI₂ morphology in two-step deposition of CH₃NH₃PbI₃ for high-performance perovskite solar cells