Mechanical & Materials Engineering, Department of


Date of this Version



Phys. Chem. Chem. Phys., 2016, 18, 11435-11442

DOI: 10.1039/c6cp00989a


Copyright © 2016 Royal Society of Chemistry. Used by permission.


Enhanced performance of polymer solar cells (PSCs) based on the blend of poly[N-9"-hepta-decanyl- 2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)] (PCDTBT):[6,6]-phenyl-C70-butyric acid methyl ester (PC71BM) is demonstrated by titanium dioxide (TiO2) interface modification via CuInS2/ZnS quantum dots (CZdots). Devices with a TiO2/CZdots composite buffer layer exhibit both a high shortcircuit current density (Jsc) and fill factor (FF), leading to a power conversion efficiency (PCE) up to 7.01%. The charge transport recombination mechanisms are investigated by an impedance behavior model, which indicates that TiO2 interfacial modification results in not only increasing the electron extraction but also reducing impedance. This study provides an important and beneficial approach to develop high efficiency PSCs.