摘要
Perylenebisimide（PBI）unithasbeenwidelyusedtodesignconjugatedmaterials,whichcanbeusedaselectronacceptorinorganicsolarcellsduetoitsstrongelectron-deficientability.Inthiswork,aconjugatedpolymerbasedonPBIdimerasmonomerwasdesigned,synthesized,andcomparedtotheconjugatedpolymercontainingsinglePBIasrepeatingunits.Thetwoconjugatedpolymerswerefoundtohavesimilarmolecularweight,absorptionspectraandenergylevels.DensityfunctionaltheorycalculationrevealedthatthePBIdimer-basedpolymerexhibitedhighlytwistedconjugatedbackboneduetothelargedihedralanglebetweenthetwoPBIunits.ThePBI-basedpolymersaselectronacceptorwereappliedintopolymer-polymersolarcells,inwhichPBIdimer-basedpolymersolarcellswerefoundtoshowahighshortcircuitcurrentdensity(Jsc=11.2mA·cm（-2）)andahighpowerconversionefficiency（PCE）of4.5%.Incomparison,thesolarcellsbasedonPBI-basedpolymeracceptoronlyprovidedaJscof7.2mA·cm-2andPCEof2.5%.ThesignificantlyenhancedPCEinPBIdimer-basedsolarcellswasattributedtothemixedphaseinblendedthinfilms,asrevealedbyatomforcemicroscopy.ThisstudydemonstratesthatPBIdimercanbeusedtodesignpolymeracceptorsforhighperformancepolymerpolymersolarcells.
出版日期
2017年02月12日（中国期刊网平台首次上网日期，不代表论文的发表时间）
