Enhanced electron extraction capability of polymer solar cells via modifying the cathode buffer layer with inorganic quantum dots,10.1039/C6CP00989A

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Lactoyl-CoA 全氟丁基戊烷白叶藤碱全氟己基辛烷新白叶藤碱壳寡糖特色专题-生物多肽

Enhanced electron extraction capability of polymer solar cells via modifying the cathode buffer layer with inorganic quantum dots

Zhiqi Li,Shujun Li,Zhihui Zhang,Xinyuan Zhang,Jingfeng Li,Chunyu Liu,Wenbin Guo,Shengping Ruan

Physical Chemistry Chemical Physics Pub Date : 04/04/2016 00:00:00 , DOI:10.1039/C6CP00989A

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 short-circuit current density (J_sc) 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.