17% Efficient Organic Solar Cells Based on Liquid Exfoliated WS2 as a Replacement for PEDOT:PSS
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- 30 September 2019
- journal article
- research article
- Published by Wiley in Advanced Materials
- Vol. 31 (46), e1902965
- https://doi.org/10.1002/adma.201902965
Abstract
The application of liquid‐exfoliated 2D transition metal disulfides (TMDs) as the hole transport layers (HTLs) in nonfullerene‐based organic solar cells is reported. It is shown that solution processing of few‐layer WS2 or MoS2 suspensions directly onto transparent indium tin oxide (ITO) electrodes changes their work function without the need for any further treatment. HTLs comprising WS2 are found to exhibit higher uniformity on ITO than those of MoS2 and consistently yield solar cells with superior power conversion efficiency (PCE), improved fill factor (FF), enhanced short‐circuit current (JSC), and lower series resistance than devices based on poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) and MoS2. Cells based on the ternary bulk‐heterojunction PBDB‐T‐2F:Y6:PC71BM with WS2 as the HTL exhibit the highest PCE of 17%, with an FF of 78%, open‐circuit voltage of 0.84 V, and a JSC of 26 mA cm−2. Analysis of the cells' optical and carrier recombination characteristics indicates that the enhanced performance is most likely attributed to a combination of favorable photonic structure and reduced bimolecular recombination losses in WS2‐based cells. The achieved PCE is the highest reported to date for organic solar cells comprised of 2D charge transport interlayers and highlights the potential of TMDs as inexpensive HTLs for high‐efficiency organic photovoltaics.Keywords
Funding Information
- King Abdullah University of Science and Technology
This publication has 51 references indexed in Scilit:
- Liquid Exfoliation of Layered MaterialsScience, 2013
- Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenidesScientific Reports, 2013
- Enhanced power-conversion efficiency in polymer solar cells using an inverted device structureNature Photonics, 2012
- A Mixed‐Solvent Strategy for Efficient Exfoliation of Inorganic Graphene AnaloguesAngewandte Chemie-International Edition, 2011
- Efficient, Air‐Stable Bulk Heterojunction Polymer Solar Cells Using MoOx as the Anode Interfacial LayerAdvanced Materials, 2011
- Accounting for Interference, Scattering, and Electrode Absorption to Make Accurate Internal Quantum Efficiency Measurements in Organic and Other Thin Solar CellsAdvanced Materials, 2010
- Hole mobility in optimized organic photovoltaic blend films obtained using extraction current transientsOrganic Electronics, 2009
- Stability of the interface between indium-tin-oxide and poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) in polymer light-emitting diodesApplied Physics Letters, 2000
- From ultrasoft pseudopotentials to the projector augmented-wave methodPhysical Review B, 1999
- Estimation of the surface free energy of polymersJournal of Applied Polymer Science, 1969