Trace Solvent Additives Enhance Charge Generation in Layer-by-Layer Coated Organic Solar Cells
Scaccabarozzi, Alberto D.
Insan Nugraha, Mohamad
Anthopoulos, Thomas D.
KAUST DepartmentPhysical Science and Engineering (PSE) Division
KAUST Solar Center (KSC)
Physical Sciences and Engineering Division (PSE) Material Science and Engineering Program (MSE) King Abdullah University of Science and Technology (KAUST) KAUST Solar Center (KSC) Thuwal 23955-6900 Kingdom of Saudi Arabia
Material Science and Engineering Program
Embargo End Date2023-02-09
Permanent link to this recordhttp://hdl.handle.net/10754/675498
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AbstractIn bulk heterojunction (BHJ) organic solar cells (OSC), the photoactive layer morphology controls charge carrier generation, transport, and extraction. Obtaining the ‘optimum’ morphology is often achieved by empiric optimization of processing conditions and post-processing treatment. Better control over the morphology can be achieved by sequential photoactive layer-by-layer (LbL) deposition techniques, creating a pseudo-bilayer OSC. Solvent additives can be used to modify the vertical component distribution, thereby enhancing OSC efficiency. However, the impact of solvent additives on device photophysics is often unclear. Here, the photophysics of LbL-coated PM6/Y6 organic solar cells are reported. Enhanced PCEs are observed when using 1-chloronaphthalene (CN) as solvent additive. Transient absorption (TA) spectroscopy indicates that the addition of 0.5% CN facilitates both exciton dissociation and charge separation, while excessive (>1%) use of CN causes fast geminate and non-geminate charge recombination and consequently deteriorates device performance. The results outline routes to fine-tune the morphology of LbL-coated photoactive layers of OSCs and provide insight into the reasons for increased PCEs.
CitationKaruthedath, Firdaus, Y., Scaccabarozzi, A. D., Insan Nugraha, M., Alam, S., Anthopoulos, T. D., & Laquai, F. (2022). Trace Solvent Additives Enhance Charge Generation in Layer-by-Layer Coated Organic Solar Cells. Small Structures. Portico. https://doi.org/10.1002/sstr.202100199
SponsorsThis publication is based on work supported by the KAUST Office of Sponsored Research (OSR) under award numbers OSR-2019-CARF/CCF-3079and OSR-CRG2018-3746.GIWAXS experiments were performed at BL11 NCD-SWEET beamlineat ALBA Synchrotron (Spain) with the collaboration of ALBA staff.