New Architecture for High-Efficiency Polymer Photovoltaic Cells Using Solution-Based Titanium Oxide as an Optical Spacer


  • We thank Prof. Se Young Jeong for his help in preparing the titanium oxide material. The research at UCSB was supported by Konarka Technologies (Lowell, MA) and by the Air Force Office of Scientific Research, AFOSR, under FA9550-05-0139. The research at Pusan National University (Busan, Korea) was supported by the National Program for Nanoscience and Technology of the Ministry of Science and Technology of Korea (M1-0214-00-0077).


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Polymer photovoltaic cells with power conversion efficiencies approaching 5 % have been fabricated using titanium oxide (TiOx) as an optical spacer (see Figure). Solar cells with a TiOx layer (deposited via a sol–gel process) between the active layer and the electron-collecting aluminum electrode exhibit approximately a 50 % enhancement in short-circuit current compared to similar devices without the optical spacer, as a result of modification of the spatial distribution of the light intensity inside the device.