@article{b04d08d0cecf401f986ffa2599381e60,
title = "Tailored PEDOT:PSS hole transport layer for higher performance in perovskite solar cells: Enhancement of electrical and optical properties with improved morphology",
abstract = "Precise control over the charge carrier dynamics throughout the device can result in outstanding performance of perovskite solar cells (PSCs). Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is the most actively studied hole transport material in p-i-n structured PSCs. However, charge transport in the PEDOT:PSS is limited and inefficient because of its low conductivity with the presence of the weak ionic conductor PSS. In addition, morphology of the underlying PEDOT:PSS layer in PSCs plays a crucial role in determining the optoelectronic quality of the active perovskite absorber layer. This work is focused on realization of a non-wetting conductive surface of hole transport layer suitable for the growth of larger perovskite crystalline domains. This is accomplished by employing a facile solvent-engineered (ethylene glycol and methanol) approach resulting in removal of the predominant PSS in PEDOT:PSS. The consequence of acquiring larger perovskite crystalline domains was observed in the charge carrier dynamics studies, with the achievement of higher charge carrier lifetime, lower charge transport time and lower transfer impedance in the solvent-engineered PEDOT:PSS-based PSCs. Use of this solvent-engineered treatment for the fabrication of MAPbI3 PSCs greatly increased the device stability witnessing a power conversion efficiency of 18.18%, which corresponds to ∼37% improvement compared to the untreated PEDOT:PSS based devices.",
keywords = "Hole transport layer, Non-wetting, PEDOT:PSS surface, PEDOT:PSS treatment, Perovskite solar cells",
author = "Reza, {Khan Mamun} and Ashim Gurung and Behzad Bahrami and Sally Mabrouk and Hytham Elbohy and Rajesh Pathak and Ke Chen and Chowdhury, {Ashraful Haider} and Rahman, {Md Tawabur} and Steven Letourneau and Yang, {Hao Cheng} and Gopalan Saianand and Elam, {Jeffrey W.} and Darling, {Seth B.} and Qiquan Qiao",
note = "Funding Information: The improved quality of the crystalline perovskite thin films using the treated PEDOT:PSS is supported by Kelvin Probe Force Microscopy (KPFM) measurements. Surface potential distribution of perovskite films ( (a)) were acquired from KPFM images shown in Fig. S8(a) and (b). The average surface potential of perovskite films formed on EG and MeOH treated PEDOT:PSS increased as compared to that deposited on the pristine one. This is due to reduced surface defects of the perovskite films Fig. 6 [57 , 58] . This significantly contributes to the enhancement of J sc and FF [59,60] . Efficient charge collection due to enhanced conductivity of the treated PEDOT:PSS reduces the probability for charge recombination at the interface, which contributed to the improvement in V oc [61] . Funding Information: This work was supported by NSF MRI (1428992), NASA EPSCoR (NNX15AM83A), U.S. ? Egypt Science and Technology (S&T) Joint Fund, SDBoR R&D Program and EDA University Center Program (ED18DEN3030025). This work is derived from the Subject Data supported in whole or part by NAS and USAID, and any opinions, findings, conclusions, or recommendations expressed in the paper are those of the authors alone, and do not necessarily reflect the views of USAID or NAS. This work was also performed, in part, at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, and supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. Publisher Copyright: {\textcopyright} 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences",
year = "2020",
month = may,
doi = "10.1016/j.jechem.2019.09.014",
language = "English (US)",
volume = "44",
pages = "41--50",
journal = "Journal of Energy Chemistry",
issn = "2095-4956",
publisher = "Elsevier",
}