Enhanced electron extraction capability of polymer solar cells via modifying the cathode buffer layer with inorganic quantum dots. Issue 16 (8th April 2016)

• Record Type: Journal Article
• Authors: Li, Zhiqi; Li, Shujun; Zhang, Zhihui; Zhang, Xinyuan; Li, Jingfeng; Liu, Chunyu; Shen, Liang; Guo, Wenbin; Ruan, Shengping
• Is Part Of: Physical chemistry chemical physics. Volume 18:Issue 16(2016)
• Page Start: 11435
• Page End: 11442
• Publication Date: 2016-04-08
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c6cp00989a
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Inorganic quantum dots were employed to modify the electron transporting layer of PSCs, and a great enhancement of PCE was achieved. 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 (PC71 BM) 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.