Abstract
As the most promising material for thin-film solar cells nowadays, perovskite shine for its unique optical and electronic properties. Perovskite-based solar cells have already been demonstrated with high efficiencies. However, it is still very challenging to optimize the morphology of perovskite film. In this paper we proposed a smooth and continuous perovskite active layer by treating the poly (3, 4-ethylenedioxythiophene): poly (styrenesulphonate) (PEDOT:PSS) with pre-perovskite deposition and dimethylsulfoxide (DMSO) rinse. The scanning electron microscope (SEM) and atomic force microscope (AFM) images confirmed a perovskite active layer consisting of large crystal grains with less grain boundary area and enhanced crystallinity. The perovskite devices fabricated by this method feature a high power conversion efficiency (PCE) of 11.36% and a short-circuit current (Jsc) of 21.9 mA·cm−2.
Highlights
Since 2012, methylammonium lead halide (MAPbX3, where MA is methylammonium CH3NH3 and X is a halogen) perovskite-based photovoltaic devices have been studied intensively [1,2,3,4,5,6,7,8,9,10,11]. These organic-inorganic hybrid compounds act as light absorbers because their small band gap and high extinction coefficients endow the solar cells strong light absorption in a broad region from visible to the near-infrared; on the other hand, the compounds perform as carrier transporters because their excellent crystallinity and long electron-hole diffusion length [12,13,14,15]. Such distinguished advantages have brought up the value of power conversion efficiency (PCE) of planar structure solar cells as high as 22.7% combined with the precise interface engineering and more importantly, optimizing the morphology of perovskite film [16]
The morphology of the perovskite layer is highly sensitive to the property of adjacent interface as exemplified by poly (3, 4-ethylenedioxythiophene): poly (PEDOT: PSS), which is extensive applied as a buffer layer in planar perovskite solar cells
A slightly increased PCE is observed for the devices with the PEDOT:PSS layer treated with drops of pure DMSO, which can be mainly attributed to the improvement of Jsc from 11.2 to 13.92 mA cm−2
Summary
Since 2012, methylammonium lead halide (MAPbX3, where MA is methylammonium CH3NH3 and X is a halogen) perovskite-based photovoltaic devices have been studied intensively [1,2,3,4,5,6,7,8,9,10,11] On one hand, these organic-inorganic hybrid compounds act as light absorbers because their small band gap and high extinction coefficients endow the solar cells strong light absorption in a broad region from visible to the near-infrared; on the other hand, the compounds perform as carrier transporters because their excellent crystallinity and long electron-hole diffusion length [12,13,14,15]. The impressive increase of short-circuit current (Jsc) from 11.2 to 21.9 mA·cm−2 greatly promotes the final PCE to be 11.36%
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