title: Enhanced efficiency of inverted polymer solar cells by using solution-processed TiOx/CsOx cathode buffer layer.
abstract: In this work, a double-buffer film of TiOx coated with CsOx (TiOx/CsOx) was solution prepared to be applied in poly(3-hexylthiophene):indene-C60 bisadduct (P3HT:ICBA) and P3HT:[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) inverted polymer solar cells (PSCs). Compared with TiOx films and CsOx films, the TiOx/CsOx double-buffer film exhibited a favorable energy-level alignment among TiOx, CsOx, and the electron acceptor of PCBM or ICBA a better surface morphology; and an enhanced wetting and adhesion property with a contact angle of 21.0°, leading to a higher electron mobility of 5.52 × 10(-3) cm(2) V(-1)·s(-1). Moreover, the P3HT:ICBA and P3HT:PCBM photovoltaic devices with the double-buffer film showed the best power conversion efficiency up to 5.65% and 3.76%, respectively. Our results not only present that the double-buffer film is superior than the single film of TiOx and CsOx, but also imply that the solution-processed film has a potential to be generally used in roll-to-roll processed organic photovoltaic devices.
authors: School of Physics and Electromechnical Engineering, Zhoukou Normal University, Zhoukou, 466001 People's Republic of China.
authors: Xiaodong
authors: X
authors: Zhou
authors: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062 People's Republic of China.
authors: Xi
authors: X
authors: Fan
authors: School of Physics and Electromechnical Engineering, Zhoukou Normal University, Zhoukou, 466001 People's Republic of China.
authors: Xianke
authors: X
authors: Sun
authors: School of Physics and Electromechnical Engineering, Zhoukou Normal University, Zhoukou, 466001 People's Republic of China.
authors: Yunli
authors: Y
authors: Zhang
authors: School of Physics and Electromechnical Engineering, Zhoukou Normal University, Zhoukou, 466001 People's Republic of China.
authors: Ziqiang
authors: Z
authors: Zhu
keywords: Cathode buffer layer; Inverted polymer solar cell; Solution processed