Mechanical & Materials Engineering, Department of

 

Document Type

Article

Date of this Version

2016

Citation

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

DOI: 10.1039/c6cp00989a

Comments

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

Abstract

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.

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