Fullerenes are electron transporting organic semiconductors with a wide range of applications.In particular,methanofullerenes have been the preferred choice for solution-processed solar cells and photodiodes.The wide ...Fullerenes are electron transporting organic semiconductors with a wide range of applications.In particular,methanofullerenes have been the preferred choice for solution-processed solar cells and photodiodes.The wide applicability of fullerenes as both‘ntype’transport materials and electron acceptors is clear.However,what is still a matter of debate is whether the fullerenes can also support efficient transport of holes,particularly in diode geometries.In this letter,we utilize a number of recently developed experimental methods for selective electron and hole mobility measurements.We show for the two most widely used solution processable fullerenes,PC70-and-PC60BM,that whilst both exhibit electron mobilities as high as 10^(−3)cm^(2)/Vs,their hole mobilities are<10^(−9)cm^(2)/Vs.Thus charge transport in these fullerenes can be considered predominantly unipolar in diode configurations.展开更多
基金the Australian Government through the Australian Renewable Energy Agency(ARENA)Australian Centre for Advanced Photovoltaics(ACAP)the Australian Government.A.A.is now a Sêr Cymru Rising Star senior fellow.P.M.is currently a Sêr Cymru Research Chair.S.S.is now a Sofja Kovalevskaja awardee of Alexander von Humboldt Foundation.P.L.B.was a University of Queensland Vice Chancellor’s Research Focused Fellow and is currently an ARC Laureate Fellow(FL160100067).
文摘Fullerenes are electron transporting organic semiconductors with a wide range of applications.In particular,methanofullerenes have been the preferred choice for solution-processed solar cells and photodiodes.The wide applicability of fullerenes as both‘ntype’transport materials and electron acceptors is clear.However,what is still a matter of debate is whether the fullerenes can also support efficient transport of holes,particularly in diode geometries.In this letter,we utilize a number of recently developed experimental methods for selective electron and hole mobility measurements.We show for the two most widely used solution processable fullerenes,PC70-and-PC60BM,that whilst both exhibit electron mobilities as high as 10^(−3)cm^(2)/Vs,their hole mobilities are<10^(−9)cm^(2)/Vs.Thus charge transport in these fullerenes can be considered predominantly unipolar in diode configurations.
