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Improved power conversion efficiency of perovskite solar cells using highly conductive WOx doped PEDOT:PSS

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Abstract

Poly(3,4-thylenedioxythiophene):poly(styrene sulfonate), PEDOT:PSS, is a popular and cost effective conducting polymer for electrodes that can also be used as a hole transport layer (HTL) in optoelectronics. In this article, we investigated the role of ethylene glycole (EG) in the conductivity enhancement of PEDOT:PSS and WOx doped PEDOT:PSS films. Multiple EG solvent treatments increase the conductivity up to 3000 S cm−1 (PEDOT:PSS) and 1980 S cm−1 (PEDOT:PSS:WOx). EG treated PEDOT:PSS:WOx thin films exhibited transmittance as high as 95% in the visible range and sheet resistance as low as 35 Ω sq−1. And, PEDOT:PSS films exhibited sheet resistance of 25 Ω sq−1 at 90% transmittance, which is the lowest value reported to date to the best of our knowledge. Additionally, thin films treated with EG multiple times exhibit improved thermal stability; thin films annealed at 250 °C have shown a remarkable stable conductivity. Furthermore, these layers are investigated as HTLs for high efficiency perovskite solar cells (PSCs). Neat PEDOT:PSS and PEDOT:PSS:WOx, and EG treated PEDOT:PSS and PEDOT:PSS:WOx integrated in PSCs demonstrated a power conversion efficiency (PCE) of 9.17%, 10.42%, 12.31% and 12.69%, respectively. The improved performance of cells with modified PEDOT:PSS HTLs results in improved current density and fill factor.

Graphical abstract: Improved power conversion efficiency of perovskite solar cells using highly conductive WOx doped PEDOT:PSS

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Publication details

The article was received on 14 Aug 2018, accepted on 30 Aug 2018 and first published on 30 Aug 2018


Article type: Paper
DOI: 10.1039/C8NJ04131H
Citation: New J. Chem., 2018, Advance Article
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    Improved power conversion efficiency of perovskite solar cells using highly conductive WOx doped PEDOT:PSS

    A. Kanwat, V. S. Rani and J. Jang, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ04131H

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