Journal
MATERIALS & DESIGN
Volume 191, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2020.108587
Keywords
PEDOT:PSS; Graphene; Hole transport layer; Doping; Perovskite solar cell; Impedance spectroscopy
Categories
Funding
- Spanish Ministerio de Economia y Competitividad (MINECO) [RTI2018-096918-B-C41, MAT2015-65356C3-2-R, ENE2017-90565-REDT]
- Young Researchers R&D Project PAS2D - Community of Madrid [F660]
- Rey Juan Carlos University
- Community of Madrid [2017-T2/IND-5586]
- European Social Fund [PEJD-2018-PRE/IND-8839]
- MINECO [BES-2016-076440]
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Poly(3,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) plays a relevant role in the device performance as hole extraction layer (HTL) of inverted perovskite solar cells. Here, we show a simple low-temperature spin coating method for obtaining homogenous graphene-doped thin films of PEDOT:PSS with improved electrical conductivity without decreasing optical transmittance. Moreover, the crystallinity and stability in ambient conditions of the perovskite grown on it are enhanced. The hydrophobic character of graphene probably blocks undesirable reactions hampering degradation. By impedance spectroscopy it is demonstrated better charge extraction and reduction of recombination mechanisms at the doped-HTL/perovskite interface, resulting in improved photovoltaic parameters of the solar cell and greater stability at room operation conditions thus providing a simple and cost-effective method of preparing solar cells based on hybrid perovskites. (C) 2020 The Authors. Published by Elsevier Ltd.
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