The transferred bilayer active layer (P3HT/PCBM) prepared from a stamping transfer technique can be expected to undergo a sharp increase in the concentration profile at the P3HT/PCBM interface. However, the PCBM top layer is unexpectedly well blended with the P3HT bottom layer during the solid film stamping process with the help of the residual solvent. Auger spectroscopy confirmed that the bilayer have almost same composition from the anode side to the cathode side as the bulk-hetero junction film. This unique discovery can be applied in preparing concentration-graded BHJ film from controlling solid-solid intermixing behavior.
Bibliographical noteFunding Information:
This work was partially supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea. This work was also supported by a grant from the ERC program of the National Research Foundation (NRF), which is funded by the Korean Ministry of Education, Science and Technology (MEST) [No.R11-2007-045-01002-0(2009)]. The authors Choi and Lee of the Korea Institute of Machinery and Materials acknowledge the support of a grant (M102KN010001-08K1401-00210) from the CNMM.
- Concentration gradient
- Photovoltaic devices
- Stamping transfer
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Materials Chemistry
- Electrical and Electronic Engineering