TY - JOUR
T1 - Efficient inverted polymer solar cells incorporating doped organic electron transporting layer
AU - Xu, Zai-Quan
AU - Yang, Jin-Peng
AU - Sun, Fu-Zhou
AU - Lee, Shuit-Tong
AU - Li, Yan-Qing
AU - Tang, Jian-Xin
PY - 2012/4
Y1 - 2012/4
N2 - An efficient inverted polymer solar cell is enabled by incorporating an n-type doped wide-gap organic electron transporting layer (ETL) between the indium tin oxide cathode and the photoactive layer for electron extraction. The ETL is formed by a thermal-deposited cesium carbonate-doped 4,7-diphenyl-1,10- phenanthroline (Cs 2CO 3:BPhen) layer. The cell response parameters critically depended on the doping concentration and film thickness of the Cs 2CO 3:BPhen ETL. Inverted polymer solar cell with an optimized Cs 2CO 3:BPhen ETL exhibits a power conversion efficiency of 4.12% as compared to 1.34% for the device with a pristine BPhen ETL. The enhanced performance in the inverted device is associated with the favorable energy level alignment between Cs 2CO 3:BPhen and the electron-acceptor material, as well as increased conductivity in the doped organic ETL for electron extraction. The method reported here provides a facile approach to optimize the performance of inverted polymer solar cells in terms of easy control of film morphology, chemical composition, conductivity at low processing temperature, as well as compatibility with fabrication on flexible substrates. © 2012 Elsevier B.V. All rights reserved.
AB - An efficient inverted polymer solar cell is enabled by incorporating an n-type doped wide-gap organic electron transporting layer (ETL) between the indium tin oxide cathode and the photoactive layer for electron extraction. The ETL is formed by a thermal-deposited cesium carbonate-doped 4,7-diphenyl-1,10- phenanthroline (Cs 2CO 3:BPhen) layer. The cell response parameters critically depended on the doping concentration and film thickness of the Cs 2CO 3:BPhen ETL. Inverted polymer solar cell with an optimized Cs 2CO 3:BPhen ETL exhibits a power conversion efficiency of 4.12% as compared to 1.34% for the device with a pristine BPhen ETL. The enhanced performance in the inverted device is associated with the favorable energy level alignment between Cs 2CO 3:BPhen and the electron-acceptor material, as well as increased conductivity in the doped organic ETL for electron extraction. The method reported here provides a facile approach to optimize the performance of inverted polymer solar cells in terms of easy control of film morphology, chemical composition, conductivity at low processing temperature, as well as compatibility with fabrication on flexible substrates. © 2012 Elsevier B.V. All rights reserved.
KW - Inverted structure
KW - n-Type doping
KW - Organic electron transporting layer
KW - Polymer solar cell
UR - http://www.scopus.com/inward/record.url?scp=84862795160&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84862795160&origin=recordpage
U2 - 10.1016/j.orgel.2012.01.009
DO - 10.1016/j.orgel.2012.01.009
M3 - RGC 21 - Publication in refereed journal
SN - 1566-1199
VL - 13
SP - 697
EP - 704
JO - Organic Electronics: physics, materials, applications
JF - Organic Electronics: physics, materials, applications
IS - 4
ER -
