Polymer photovoltaic (PV) device prepared with a vertical phase separation has intensified the research on the effectiveness of the concentration graded active layer. In this paper, a polymer PV device with a poly(3-hexylthiophene)/ [6,6]-phenyl C61 -butyric acidmethyl ester (P3HT/PCBM) bilayers active film with a concentration gradient has been fabricated via solution process. The concentration variation has been confirmed by the Auger spectroscopy. The devices showed an enhanced photocurrent density and power conversion efficiency compared to those of the bulk heterojunction PV prepared under the same fabrication condition.
Bibliographical noteFunding Information:
This work was partially supported by the grant from the ERC program of the Korea Science and Engineering Foundation (KOSEF) funded by the Korea Ministry of Education, Science and Technology (MEST) [Grant No. R11-2009-045-01002-0(2009)]. One of the authors of KIMM (D.G.C.) acknowledges the support from a grant (Grant No. M102KN010001-08K1401-00210) from CNMM. This work was also 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.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)