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PEDOT:PSS Monolayers to Enhance Hole Extraction and Stability of Perovskite Solar Cells

Abstract

Hole transport layer (HTL) plays a key role for efficient hole extraction and transfer in inverted planar perovskite solar cells. A 10-20 nm thick poly (3, 4-ethylenedioxythiphene):poly(styrenesulfonate) (PEDOT:PSS) layer is the most popular HTL in such a device structure. But is it essential to construct such a thick PEDOT:PSS layer? To address this question, herein self-assembled PEDOT:PSS monolayers are obtained on indium tin oxide (ITO) surface through a facile water rinsing process. Perovskite solar cells with water rinsed PEDOT:PSS as HTL yield improved power conversion efficiency (PCE) from 13.4% to 18.0%, compared with the control cells with as-cast PEDOT:PSS. The main contribution is from open-circuit voltage (Voc) and fill factor (FF). Characterizations indicate majority of PEDOT:PSS are washed away, but an ultra-thin layer of PEDOT:PSS can attach strongly on ITO via In-O-S chemical bonds between PSS chain and ITO. Subsequently, PEDOT and PSS form a bilayered structure due to coulomb interaction. Such an arrangement induces an oriented electric field from positively charged PEDOT to negatively charged PSS, which can accelerate the process of hole extraction. Moreover, the oriented arrangement of PEDOT:PSS monolayers endows higher work function and stronger hydrophobicity, leading to the enhancement in Voc and stability in ambient environment. This work suggests there is still room for the efficiency improvement of perovskite solar cells by optimizing the traditional functional layers.

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Publication details

The article was received on 03 Jun 2018, accepted on 27 Jul 2018 and first published on 27 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA05234D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    PEDOT:PSS Monolayers to Enhance Hole Extraction and Stability of Perovskite Solar Cells

    L. Hu, M. Li, K. Yang, Z. Xiong, B. Yang, M. Wang, X. Tang, Z. Zang, X. Liu, B. Li, Z. Xiao, S. Lu, H. Gong, J. Ouyang and K. Sun, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA05234D

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