Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels

Abstract

Efficient organic solar cells (OSCs) are fabricated using polymer PM6 as donor, and IPTBO‐4Cl and MF1 as acceptors. The power conversion efficiency (PCE) of IPTBO‐4Cl based and MF1 based binary OSCs individually arrive to 14.94% and 12.07%, exhibiting markedly different short circuit current density (JSC) of 23.18 mA cm−2 versus 17.01 mA cm−2, fill factor (FF) of 72.17% versus 78.18% and similar open circuit voltage (VOC) of 0.893 V versus 0.908 V. The two acceptors, IPTBO‐4Cl and MF1, have similar lowest unoccupied molecular orbital levels, which is beneficial for efficient electron transport in the ternary active layer. The PCE of optimized ternary OSCs arrives to 15.74% by incorporating 30 wt% MF1 in acceptors, resulting from the simultaneously increased JSC of 23.20 mA cm−2, VOC of 0.897 V, and FF of 75.64% in comparison with IPTBO‐4Cl based binary OSCs. The gradually increased FFs of ternary OSCs indicate the well‐optimized phase separation and molecular arrangement with MF1 as morphology regulator. This work may provide a new viewpoint for selecting an appropriate third component to achieve efficient ternary OSCs from materials and photovoltaic parameters of two binary OSCs.

Benzoselenadiazole‐core asymmetric D‐A‐A small molecule for solution processed bulk heterojunction organic solar cells

“…The organic small molecule, 4-(3,5-bis (trifluoromethyl) phenyl)-7-(5 0 -hexyl-[2,2 0 -bithiophen]-5-yl)-benzo[c] [1,2,5] selenadiazole, (RT-BSe-F), was synthesized by a route of Suzuki cross-coupling reaction. The complete reactions are displayed by Scheme 1.…”

“…Bulk heterojunction (BHJ) based organic photovoltaics have solicited a considerable attention owing to their low production cost, easy synthesis, and potential applications for light weight and flexible devices 1‐6 . BHJ based organic solar cells (BHJ‐OSCs) are majorly consisted of rational designs of donor and acceptor organic molecules.…”

Rational Mutual Interactions in Ternary Systems Enable High‐Performance Organic Solar Cells

“…[4,5,25,26] In addition, the elaborately designed guest acceptors also promote PCEs above 15% in some Y6-absent TOSCs based on the underperforming host binary devices. [10,27,28] In spite of these exciting achievements, less deep understanding of the critical roles that guest components played in these complicated ternary systems still limit the further development of TOSCs.…”

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.…”

“…Therefore, it is imperative to discover compatible materials with decent photovoltaic performance in designing ternary BHJ‐OSCs. [ 17,20,26 ]…”