O3 fast and simple treatment-enhanced p-doped in Spiro-MeOTAD for CH3NH3I vapor-assisted processed CH3NH3PbI3 perovskite solar cells

doi:10.1088/1674-1056/26/6/068803

Abstract We demonstrate a simple and fast post-deposition treatment with high process compatibility on the hole transport material (HTM) Spiro-MeOTAD in vapor-assisted solution processed methylammonium lead triiodide (CH₃NH₃PbI₃)-based solar cells. The prepared Co-doped p-type Spiro-MeOTAD films are treated by O₃ at room temperature for 5 min, 10 min, and 20 min, respectively, prior to the deposition of the metal electrodes. Compared with the traditional oxidation of Spiro-MeOTAD films overnight in dry air, our fast O₃ treatment of HTM at room temperature only needs just 10 min, and a relative 40.3% increment in the power conversion efficiency is observed with respect to the result of without-treated perovskite solar cells. This improvement of efficiency is mainly attributed to the obvious increase of the fill factor and short-circuit current density, despite a slight decrease in the open-circuit voltage. Ultraviolet photoelectron spectroscopy (UPS) and Hall effect measurement method are employed in our study to determine the changes of properties after O₃ treatment in HTM. It is found that after the HTM is exposed to O₃, its p-type doping level is enhanced. The enhancement of conductivity and Hall mobility of the film, resulting from the improvement in p-doping level of HTM, leads to better performances of perovskite solar cells. Best power conversion efficiencies (PCEs) of 13.05% and 16.39% are achieved with most properly optimized HTM via CH₃NH₃I vapor-assisted method and traditional single-step method respectively.

Keywords: perovskite solar cells Spiro-MeOTAD simple O₃ treatment

Received: 19 December 2016
Revised: 10 February 2017
Accepted manuscript online:

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

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51472016 and 51272015).

Corresponding Authors: Chun-Lan Zhou, Wei-Chang Hao
E-mail: chunlzhou@gmail.com;whao@buaa.edu.cn

Cite this article:

En-Dong Jia(贾恩东), Xi Lou(娄茜), Chun-Lan Zhou(周春兰), Wei-Chang Hao(郝维昌), Wen-Jing Wang(王文静) O₃ fast and simple treatment-enhanced p-doped in Spiro-MeOTAD for CH₃NH₃I vapor-assisted processed CH₃NH₃PbI₃ perovskite solar cells 2017 Chin. Phys. B 26 068803

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O3 fast and simple treatment-enhanced p-doped in Spiro-MeOTAD for CH3NH3I vapor-assisted processed CH3NH3PbI3 perovskite solar cells

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O₃ fast and simple treatment-enhanced p-doped in Spiro-MeOTAD for CH₃NH₃I vapor-assisted processed CH₃NH₃PbI₃ perovskite solar cells