title: High performance polymer solar cells with as-prepared zirconium acetylacetonate film as cathode buffer layer.
abstract: Low-work-function active metals are commonly used as cathode in polymer solar cells (PSCs), but sensitivity of the active metals towards moisture and oxygen results in poor stability of the devices. Therefore, solution-proceessable and stable cathode buffer layer is of great importance for the application of PSCs. Here we demonstrate high performance PSCs by employing as-prepared zirconium acetylacetonate (a-ZrAcac) film spin-cast from its ethanol solution as cathode buffer layer. The PSCs based on a low bandgap polymer PBDTBDD as donor and PC60BM as acceptor with a-ZrAcac/Al cathode demonstrated an average power conversion efficiency (PCE) of 8.75% which is significantly improved than that of the devices with traditional Ca/Al cathode. The improved photovoltaic performance is benefitted from the decreased series resistance and enhanced light harvest of the PSCs with the a-ZrAcac/Al cathode. The results indicate that a-ZrAcac is a promising high performance cathode buffer layer for fabricating large area flexible PSCs.
authors.affiliation: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of Energy Security and Clean Utilization, North China Electric Power University, Beijing 102206, China.
authors.forename: Zhan'ao
authors.initials: Z
authors.lastname: Tan
authors.affiliation: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of Energy Security and Clean Utilization, North China Electric Power University, Beijing 102206, China.
authors.forename: Shusheng
authors.initials: S
authors.lastname: Li
authors.affiliation: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of Energy Security and Clean Utilization, North China Electric Power University, Beijing 102206, China.
authors.forename: Fuzhi
authors.initials: F
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of Energy Security and Clean Utilization, North China Electric Power University, Beijing 102206, China.
authors.forename: Deping
authors.initials: D
authors.lastname: Qian
authors.affiliation: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of Energy Security and Clean Utilization, North China Electric Power University, Beijing 102206, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Lin
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Jianhui
authors.initials: J
authors.lastname: Hou
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Yongfang
authors.initials: Y
authors.lastname: Li
references.citation: Adv Mater. 2011 Oct 25;23(40):4636-43
references.pmid: 21905131
references.citation: Adv Mater. 2013 Dec 17;25(47):6889-94
references.pmid: 24123199
references.citation: Science. 1992 Nov 27;258(5087):1474-6
references.pmid: 17755110
references.citation: ACS Appl Mater Interfaces. 2011 Apr;3(4):1063-7
references.pmid: 21395281
references.citation: J Am Chem Soc. 2010 Feb 3;132(4):1377-82
references.pmid: 20055460
references.citation: Acc Chem Res. 2009 Nov 17;42(11):1709-18
references.pmid: 19572607
references.citation: Adv Mater. 2011 May 17;23(19):2226-30
references.pmid: 21469222
references.citation: Adv Mater. 2012 Mar 15;24(11):1476-81
references.pmid: 22407842
references.citation: J Am Chem Soc. 2006 Apr 12;128(14):4911-6
references.pmid: 16594728
references.citation: Chem Rev. 2007 Apr;107(4):1324-38
references.pmid: 17428026
references.citation: J Am Chem Soc. 2013 Jun 12;135(23):8464-7
references.pmid: 23705764
references.citation: J Nanosci Nanotechnol. 2011 Jul;11(7):5995-6000
references.pmid: 22121646
references.citation: J Phys Chem A. 2007 May 24;111(20):4117-21
references.pmid: 17474731
references.citation: Acc Chem Res. 2012 May 15;45(5):723-33
references.pmid: 22288572
references.citation: ACS Appl Mater Interfaces. 2009 Jan;1(1):102-12
references.pmid: 20355761