420 nm thick CH3NH3PbI3-xBrx capping layers for efficient TiO2 nanorod array perovskite solar cells

doi:10.1088/1674-1056/27/1/018804

Abstract The rutile TiO₂ nanorod arrays with 240 nm in length, 30 nm in diameter, and 420 μm^-2 in areal density were prepared by the hydrothermal method to replace the typical 200-300 nm thick mesoporous TiO₂ thin films in perovskite solar cells. The CH₃NH₃PbI_3-xBr_x capping layers with different thicknesses were obtained on the TiO₂ nanorod arrays using different concentration PbI₂· DMSO complex precursor solutions in DMF and the photovoltaic performances of the corresponding solar cells were compared. The perovskite solar cells based on 240 nm long TiO₂ nanorod arrays and 420 nm thick CH₃NH₃PbI_3-xBr_x capping layers showed the best photoelectric conversion efficiency (PCE) of 15.56% and the average PCE of 14.93±0.63% at the relative humidity of 50%-54% under the illumination of simulated AM 1.5 sunlight (100 mW· cm^-2).

Keywords: rutile TiO₂ nanorod array CH₃NH₃PbI_3-xBr_x capping layer perovskite solar cell

Received: 23 September 2017
Revised: 16 November 2017
Accepted manuscript online:

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

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51472071 and 51272061) and Talent Project of Hefei University of Technology, China (Grant Nos. 75010-037004 and 75010-037003).

Corresponding Authors: Cheng-Wu Shi
E-mail: shicw506@foxmail.com,shicw506@hfut.edu.cn

Cite this article:

Long Li(李龙), Cheng-Wu Shi(史成武), Xin-Lian Deng(邓新莲), Yan-Qing Wang(王艳青), Guan-Nan Xiao(肖冠南), Ling-Ling Ni(倪玲玲) 420 nm thick CH₃NH₃PbI_3-xBr_x capping layers for efficient TiO₂ nanorod array perovskite solar cells 2018 Chin. Phys. B 27 018804

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420 nm thick CH3NH3PbI3-xBrx capping layers for efficient TiO2 nanorod array perovskite solar cells

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420 nm thick CH₃NH₃PbI_3-xBr_x capping layers for efficient TiO₂ nanorod array perovskite solar cells