High-Efficiency Ternary Polymer Solar Cells with a Gradient-Blended Structure Fabricated by Sequential Deposition

Abstract

Acquiring the ideal blend morphology of the active layer to optimize charge separation and collection is a constant goal of polymer solar cells (PSCs). In this paper, the ternary strategy and the sequential deposition process were combined to make sufficient use of the solar spectrum, optimize the energy-level structure, regulate the vertical phase separation morphology, and ultimately enhance the power conversion efficiency (PCE) and stability of the PSCs. Specifically, the donor and acceptor illustrated a gradient-blended distribution in the sequential deposition-processed films, thus resulting in facilitated carrier characteristics in the gradient-blended devices. Consequently, the PSCs based on D18-Cl/Y6:ZY-4Cl have achieved a device efficiency of over 18% with the synergetic improvement of open-circuit voltage (V OC), short-circuit current density (J SC), and fill factor (FF). Therefore, this work reveals a facile approach to fabricating PSCs with improved performance and stability.

Excellent Electroluminescent Property of Eu3+-Induced Polystyrene-co-poly(acrylic acid) Aggregates (EIPAs) in Polymeric Light-Emitting Diodes

“…The broad emission spectra of conjugated polymers and small organic molecules present a challenge in achieving efficient and pure red emissions from these materials. However, higher-quality light sources for special applications, such as temperature sensing with luminescent thermometers, require narrow emission spectra. − Eu 3+ complexes as electroluminescence centers are an excellent alternative candidate to provide high-quality sharp red emission. ,,− Around 615 nm, the Eu 3+ ions experience an electron transition from the 5 D 0 to the 7 F 2 state, leading to the emission of a sharp and bright red light. This light is characterized by a narrow full width at half-maximum (fwhm).…”

Cost-effective polymer donors with simple structure for organic solar cells

“…Thanks to the continuous optimization of non-fullerene acceptors (such as ITIC and Y6) and device processes, the PCEs of single-junction OSCs have increased to nearly 20%. 21–30 The development of polymer donors that can match well with these non-fullerene acceptors is essential for the commercialization and large-scale application of OSCs. The ideal polymer donors that match non-fullerene acceptors should have the following characteristics: 31 a relatively wide bandgap (>1.8 eV), adequate energy levels and suitable aggregation properties.…”