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Open AccessArticle

Acidity Suppression of Hole Transport Layer via Solution Reaction of Neutral PEDOT:PSS for Stable Perovskite Photovoltaics

1
School of Integrative Engineering, Chung-Ang University, Seoul 06974, Korea
2
School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon-si 16419, Korea
*
Authors to whom correspondence should be addressed.
Polymers 2020, 12(1), 129; https://doi.org/10.3390/polym12010129
Received: 27 November 2019 / Revised: 28 December 2019 / Accepted: 1 January 2020 / Published: 6 January 2020
(This article belongs to the Special Issue Polymer-Based Solar Cells)
Poly(3,4-ethylenedioxythiophene): poly(4-styrenesulfonate) (PEDOT:PSS) is typically used for hole transport layers (HTLs), as it exhibits attractive mechanical, electrical properties, and easy processability. However, the intrinsically acidic property can degrade the crystallinity of perovskites, limiting the stability and efficiency of perovskite solar cells (PSCs). In this study, inverted CH3NH3PbI3 photovoltaic cells were fabricated with acidity suppressed HTL. We adjusted PEDOT:PSS via a solution reaction of acidic and neutral PEDOT:PSS. And we compared the various pH-controlled HTLs for PSCs devices. The smoothness of the pH-controlled PEDOT:PSS layer was similar to that of acidic PEDOT:PSS-based devices. These layers induced favorable crystallinity of perovskite compared with acidic PEDOT:PSS layers. Furthermore, the enhanced stability of pH optimized PEDOT:PSS-based devices, including the prevention of degradation by a strong acid, allowed the device to retain its power conversion efficiency (PCE) value by maintaining 80% of PCE for approximately 150 h. As a result, the pH-controlled HTL layer fabricated through the solution reaction maintained the surface morphology of the perovskite layer and contributed to the stable operation of PSCs. View Full-Text
Keywords: conducting polymers; photovoltaic devices; controlled pH; charge transport; stability conducting polymers; photovoltaic devices; controlled pH; charge transport; stability
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MDPI and ACS Style

Kim, M.; Yi, M.; Jang, W.; Kim, J.K.; Wang, D.H. Acidity Suppression of Hole Transport Layer via Solution Reaction of Neutral PEDOT:PSS for Stable Perovskite Photovoltaics. Polymers 2020, 12, 129.

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