A three-dimensional thiophene-annulated perylene bisimide as a fullerene-free acceptor for a high performance polymer solar cell with the highest PCE of 8.28% and a V-OC over 1.0 V

作者：Luo, Zhenghui; Liu, Tao; Cheng, Wanli; Wu, Kailong; Xie, Dongjun; Huo, Lijun; Sun, Yanming^*; Yang, Chuluo^*

来源：Journal of Materials Chemistry C, 2018, 6(5): 1136-1142.

DOI：10.1039/c7tc05261h

• POWER CONVERSION EFFICIENCY
• ENERGY-LEVEL MODULATION
• ELECTRON-ACCEPTORS
• MOLECULAR ACCEPTOR
• DIIMIDE DIMERS
• RING-FUSION
• STRATEGY
• PDI

A new propeller-shaped small-molecule acceptor of BPT-S with S-annulated perylene bisimide (PBI) as peripheral groups was designed and synthesized. Compared to the unannulated counterpart (BPT), BPT-S exhibits a blue-shift absorption spectrum, stronger absorption in the region of 400-510 nm, higher LUMO energy level and twisted molecular geometry. The BPT-S-based device with PDBT-T1 as the donor achieved a power conversion efficiency (PCE) as high as 8.28% with an impressively high open-circuit voltage (V-OC) of 1.02 V, a near 16% enhancement in PCE with respect to the BPT-based control device (7.16%). The high photovoltaic performance for the BPT-S-based device can be attributed to its relatively high-lying LUMO level, complementary absorption spectra with the donor material, favorable morphology and balanced carrier transport. To the best of our knowledge, a PCE of 8.28% is the highest value for the device based on S-annulated PBIs as acceptors reported so far. This work indicates the great potential of the 3D S-annulated PBI-based acceptors for tandem (or multi-junction) organic solar cells due to the proper absorption spectra and high photovoltaic performance.

• 出版日期2018-2-7
• 单位武汉大学; 北京航空航天大学