Argon Plasma Treatment to Tune Perovskite Surface Composition for High Efficiency Solar Cells and Fast Photodetectors

Xun Xiao; Chunxiong Bao; Yanjun Fang; Jun Dai; Benjamin R Ecker; Congcong Wang; Yuze Lin; Shi Tang; Ye Liu; Yehao Deng; Xiaopeng Zheng; Yongli Gao; Xiao Cheng Zeng; Jinsong Huang

doi:10.1002/adma.201705176

Argon Plasma Treatment to Tune Perovskite Surface Composition for High Efficiency Solar Cells and Fast Photodetectors

Adv Mater. 2018 Mar;30(9). doi: 10.1002/adma.201705176. Epub 2018 Jan 10.

Authors

Xun Xiao^{1

2}, Chunxiong Bao², Yanjun Fang², Jun Dai³, Benjamin R Ecker⁴, Congcong Wang⁴, Yuze Lin^{1

2}, Shi Tang², Ye Liu², Yehao Deng^{1

2}, Xiaopeng Zheng², Yongli Gao⁴, Xiao Cheng Zeng³, Jinsong Huang^{1

2}

Affiliations

¹ Department of Applied Physical Sciences, University of North Carolina, Chapel Hill, NC, 27599, USA.
² Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, NE, 68588, USA.
³ Department of Chemistry, University of Nebraska-Lincoln, NE, 68588, USA.
⁴ Department of Physics and Astronomy, University of Rochester, Rochester, NY, 14627, USA.

PMID: 29318712
DOI: 10.1002/adma.201705176

Abstract

The surface composition of perovskite films is very sensitive to film processing and can deviate from the optimal, which generates unfavorable defects and results in efficiency loss in solar cells and slow response speed in photodetectors. An argon plasma treatment is introduced to modify the surface composition by tuning the ratio of organic and inorganic components as well as defect type before deposition of the passivating layer. It can efficiently enhance the charge collection across the perovskite-electrode interface by suppressing charge recombination. Therefore, perovskite solar cells with argon plasma treatment yield enhanced efficiency to 20.4% and perovskite photodetectors can reach their fastest respond speed, which is solely limited by the carrier mobility.

Keywords: argon plasma; perovskites; photodetectors; solar cells.