Details

Autor(en) / Beteiligte

• He, Chengliang
• Pan, Youwen
• Ouyang, Yanni
• Shen, Qing
• Gao, Yuan
• Yan, Kangrong
• Fang, Jin
• Chen, Yiyao
• Ma, Chang-Qi
• Min, Jie
• Zhang, Chunfeng
• Zuo, Lijian
• Chen, Hongzheng

Titel

Manipulating the D:A interfacial energetics and intermolecular packing for 19.2% efficiency organic photovoltaics

Ist Teil von

• Energy & environmental science, 2022-06, Vol.15 (6), p.2537-2544

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Manipulating the donor:acceptor (D:A) energetics, e.g. , the highest occupied molecular orbital (HOMO) offset, is the key to balancing the charge separation and charge recombination for high-performance organic solar cells (OSCs). Herein, we designed and synthesized a non-fullerene electron acceptor, i.e. , BTP-H2, which shows strong intermolecular interaction and near-zero HOMO offset when pairing with polymer donor PM6. Transient absorption spectroscopies unveil that BTP-H2 exhibits a long-lived intra-moiety charge-separation state, which contributes to efficient hole transfer or charge generation, irrespective of the small HOMO offset. In addition, the small energetic offset reduces the non-radiative loss for a high open-circuit voltage ( V oc ). As a result, we demonstrate high-performance OSCs with the best power conversion efficiency (PCE) of 18.5%, a high V oc of 0.932 V and a peak photon-to-electron response of ∼ 90%. Furthermore, ternary OSCs comprising PM6:BTP-H2:L8-BO exhibit a champion PCE of 19.2% (certified value of 18.8%) due to the improved balance between charge generation and charge recombination, and this represents the best among PCEs of single-junction OSCs. A novel electron acceptor, BTP-H2, demonstrates a high efficiency of 18.5% with a high V oc of 0.932 V. It also enables the ternary device to yield an efficiency of 19.2%, ranking the highest among single-junction organic photovoltaics.