Stoichiometric dependence of TiOx as a cathode modifier on band alignment of polymer solar cells

Yun Chieh Yeh, Shao Sian Li, Chao Chuan Wu, Teng Wei Shao, Pai Chia Kuo, Chun Wei Chen

研究成果: 雜誌貢獻文章

10 引文 斯高帕斯(Scopus)


In this study, we systematically investigated the stoichiometric dependence of titanium oxide (TiOx, x=1.56-1.93) as a cathode modifier on the device performance of polymer solar cells. Electronic structures of the synthesized TiOx modifier layers were controlled by tuning the compositions of various O/Ti ratios. The effective cathode work-functions and the corresponding device performances of polymer solar cells are systematically changed as a result of inserting the TiOx modification layers. Interfacial modification of the Al cathode with a low O/Ti ratio of TiO x layer yields the best performing photovoltaic device as a result of a largest built-in potential. The correlation of power conversion efficiencies and carrier dynamics of these devices by inserting various TiOx modification layer is further examined by using the Mott-Schottky analysis and the impedance spectroscopy technique. The consistent result shows an enhanced carrier collection efficiency and a reduced charge recombination rate of the device via adequate band alignment between the photoactive layer and the cathode using the TiOx modification layer with an optimized O/Ti ratio.
頁(從 - 到)233-238
期刊Solar Energy Materials and Solar Cells
出版狀態已發佈 - 一月 1 2014


ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films