Cheng P1,2, Yan C3, Lau TK4, Mai J4, Lu X4, Zhan X3.
Adv Mater. 2016 Jul;28(28):5822-9. doi: 10.1002/adma.201600426. Epub 2016 May 9.4,4'-Biphenol (BPO), a common, cheap chemical, is employed as a "molecular lock" in blends of fluorine-containing polymer or small molecule donors and fullerene acceptors to lock donors via hydrogen bond formed between the donor and BPO. The molecular lock is a versatile key to enhance the efficiency and stability of organic solar cells simultaneously. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.