Exploiting Ternary Blends for Improved Photostability in High-Efficiency Organic Solar Cells

Abstract

Ternary organic solar cells based on polymer donor and nonfullerene acceptors (NFAs) are delivering high power conversion efficiencies (PCE). Now, further improvement needs to be directed to enhance the operational lifetime of organic photovoltaics. Here, we selected three NFAs with different electron affinities and structural properties and found that the most crystalline third component, O-IDTBR, is selectively miscible within the acceptor phase. This reduced trap-assisted recombination and delivered a PCE of 16.6% and a fill factor of 0.76, compared to PM6:Y6 binary devices (15.2% PCE). Charge transport and recombination analyses revealed that O-IDTBR acts as a charge relay for improved charge transfer of both donor and acceptor materials leading to a more ordered transport. We find that minimizing traps formation in ternary devices deactivates light-induced traps upon full sun illumination (AM1.5G). As a result, ternary devices do not show any PCE drop in 225h, in comparison to binary cells which lose more than 60% of their initial performances.

Single-Component Non-halogen Solvent-Processed High-Performance Organic Solar Cell Module with Efficiency over 14%

“…The light-soaking test was conducted under a white LED lamp with intensity collaborated to generate the same device photocurrent as that under the solar simulator. As shown in Figure S27, the module exhibited a typical burn-in loss as what is observed in small-area OSC devices, 32,46 and kept 70% of its initial efficiency even after experiencing 300 h continuous illumination. Notably, the stability of the module device should be further improved by using Article more rigorous encapsulation.…”

The Bulk Heterojunction in Organic Photovoltaic, Photodetector, and Photocatalytic Applications

“…Finally, the ternary blend showed enhanced photostability compared to PM6:Y6 binary due the deactivation of light-induced traps. [97] Enhancing the charge transport of PM6:Y6 has also been demonstrated by adding PC 71 BM. In this ternary blend, the electron mobility increased, which leads to a more balanced charge transport, resulting in a FF of 0.77 and PCE of 16.5%.…”

Chlorinated Carbon‐Bridged and Silicon‐Bridged Carbazole‐Based Nonfullerene Acceptors Manifest Synergistic Enhancement in Ternary Organic Solar Cell with Efficiency over 15%

“…[ 15 ] To further elevate the PCE of BHJ‐OSCs, integrating two binary OSCs into one ternary OSC has been deemed as one of the most effective approaches. [ 16–27 ] By tuning the content of the active layer, ternary BHJ‐OSCs, comprising either two donors or two acceptors, can produce a remarkable open‐circuit voltage ( V OC ), short‐circuit current density ( J SC ), and fill factor (FF). Moreover, the unique features observed in intrinsic binary OSCs are likely to be inherited in ternary OSCs.…”