Chinese Journal of Chemistry
Copyright © 2013 SIOC, CAS, Shanghai & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Cover Picture: Synthesis and Photovoltaic Properties of Polythiophene Incorporating with 3,4-Difluorothiophene Units (Chin. J. Chem. 11/2013)
The cover picture shows a new polythiophene derivative PHTDFT designed for polymer solar cells. The introduction of fluorine atoms to the polymer backbones simultaneously lowers the HOMO energy level and narrows the bandgap. Benefiting from the lower HOMO, PHTDFT:PC61BM (1:1) polymer solar cells obtain a power conversion efficiency of 1.11% and an impressed open-circuit voltage of 0.79 V under solar illumination AM1.5 (100 mW/cm2). More details are discussed in the article by Zhang et al. on page 1385–1390.