Highly efficient ternary solar cells with reduced non-radiative energy loss and enhanced stability via two compatible non-fullerene acceptors

Abstract

Ternary strategy by introducing a third component into the binary host system has been proven to be a simple and promising method to boost the power conversion efficiency (PCE) and...

Photostable organic solar cells based on non-fullerene acceptors with an aminated bathocuproine electron transport layer

“…Meanwhile, for the BHJ/BCP film, it is noticeable that the Y6 peak position (∼800 nm) is slightly blue-shifted with increasing photoirradiation time, while no change in the peak position is observed for the BHJ/BCPN film. Since the blue-shift in the absorption spectra implies a deaggregation of Y6, 58–60 we attribute this observation to the diffusion of BCP molecules into Y6 molecules. However, for the BHJ/BCPN film, the peaks observed at approximately 800 nm are similar, indicating that the diffusion of BCPN molecules into the BHJ film is prevented, which agrees well with the findings from the AFM images.…”

Recent Developments of Polymer Solar Cells with Photovoltaic Performance over 17%

“…[265] Apart from improving photon utilization, broadening spectrum, optimizing morphology, balancing excitons separation and charge transport, synergistically enhancing photovoltaic parameters and reducing energy loss are other ideal functions of the third component incorporating to the host system, and also are the focus in the field of organic photovoltaics. [209,[266][267][268] There are four mechanisms that can be used to describe the role of the third component in the host binary devices, as shown in Figure 17. 1) In the charge transfer mechanism also known as the energy cascade mechanism, the third component is equivalent to a relay located at the D/A interface of the host binary system, which is conducive to charge separation and transfer.…”

“…[ 265 ] Apart from improving photon utilization, broadening spectrum, optimizing morphology, balancing excitons separation and charge transport, synergistically enhancing photovoltaic parameters and reducing energy loss are other ideal functions of the third component incorporating to the host system, and also are the focus in the field of organic photovoltaics. [ 209,266–268 ]…”

Structural Fusion Yields Guest Acceptors that Enable Ternary Organic Solar Cells with 18.77 % Efficiency

“…Generally, an appropriate guest acceptor should possess: 1) complementary absorption with the host binary to ensure sufficient sunlight harvesting, 2) suitable energy levels to form an energy cascade alignment, and 3) good compatibility with the host acceptor to form a suitable bulk heterojunction (BHJ) microstructure [9] . Recently, several research groups proved that, as the guest acceptors, the addition of IDT‐ or IDTT‐derived A‐D‐A type FREAs featuring five‐membered carbon bridges such as MOIT‐M, [10] 4‐TIC, [11] and MeIC, [12] is capable of significantly improving the performance of the Y6‐derived OPVs. The overall J sc and V oc of ternary OSCs synergically were increased by their complementary absorption with a Y6‐based blend, upshifted LUMO energy level relative to Y6, and good miscibility with Y6 (Scheme 1).…”