title: Enhanced Performance of Inverted Polymer Solar Cells by Combining ZnO Nanoparticles and Poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctyfluorene)] as Electron Transport Layer.
abstract: A highly efficient inverted polymer solar cell (PSC) has been successfully demonstrated by using a ZnO nanoparticle (NP) and poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctyfluorene)] (PFN) bilayer structure as an effective electron collecting layer. This ZnO/PFN bilayer structure is designed to combine the advantages of both ZnO and PFN, based on the performance comparison of ZnO-only, PFN-only, and ZnO/PFN bilayer devices in our work. ZnO NPs can serve as an efficient electron transport and buffer layer for reduced series resistance, while the PFN interlayer can improve the energy level alignment of devices through the formation of an interfacial dipole. With the enhanced electron extraction induced by the ZnO/PFN bilayer structure and PTB7:ICBA:PC71BM ternary system, the corresponding inverted PSC device shows a high PCE of 9.3%, which is more than a 15% improvement compared to the ZnO- or PFN-only devices.
authors.affiliation: Key Laboratory for Special Functional Materials of Ministry of Education, Henan University , Kaifeng, Henan 475004, P. R. China.
authors.forename: Changfeng
authors.initials: C
authors.lastname: Han
authors.affiliation: Key Laboratory for Special Functional Materials of Ministry of Education, Henan University , Kaifeng, Henan 475004, P. R. China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Cheng
authors.affiliation: Key Laboratory for Special Functional Materials of Ministry of Education, Henan University , Kaifeng, Henan 475004, P. R. China.
authors.forename: Ling
authors.initials: L
authors.lastname: Chen
authors.affiliation: Key Laboratory for Special Functional Materials of Ministry of Education, Henan University , Kaifeng, Henan 475004, P. R. China.
authors.forename: Lei
authors.initials: L
authors.lastname: Qian
authors.affiliation: School of Optoelectronics, Beijing Institute of Technology , Beijing 100081, P.R. China.
authors.forename: Ziyan
authors.initials: Z
authors.lastname: Yang
authors.affiliation: School of Optoelectronics, Beijing Institute of Technology , Beijing 100081, P.R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xue
authors.affiliation: School of Optoelectronics, Beijing Institute of Technology , Beijing 100081, P.R. China.
authors.forename: Ting
authors.initials: T
authors.lastname: Zhang
authors.affiliation: NanoPhotonica, Inc ., Gainesville, Florida 32601, United States.
authors.forename: Yixing
authors.initials: Y
authors.lastname: Yang
authors.affiliation: NanoPhotonica, Inc ., Gainesville, Florida 32601, United States.
authors.forename: Weiran
authors.initials: W
authors.lastname: Cao
keywords: PFN; ZnO nanoparticles; bilayer; electron transport layer; polymer solar cells; rapid thermal processing