Metal Phthalocyanine Derivatives as Dopant-Free Hole-Transporting Materials in Perovskite Solar Cells
Small molecule metallophthalocyanine compounds(MPc are a class of materials with good thermal and chemical stability and high hole mobility,and are considered to be promising candidates for hole-transporting materials(HTMs)in perovskite solar cell(PSCs).The α-tetra(4-tert-butylphe-noxy)-substituted CuPc and NiPc,termed CuPc-TB and NiPc-TB,have been synthesized and suc-cessfully applied as dopant-free HTMs in mesoscopic PSCs.The incorporation of Cu atom induced a stronger H-aggregation(face to face)molecular packing of MPc molecules in thin films,and thus en-hanced hole transport ability as compared with Ni atom.When employed as dopant-free HTMs by solu-tion-processing technique,the CuPc-TB based PSCs exhibited the highest PCE of 17.3％under one sun illumination,which was superior to that of the NiPc-TB based devices(16.5％).In addition,the PSC device based on CuPc-TB as dopant-free HTM displayed better stability than the doped Spiro-OMeTAD based one,when stored in the dark without encapsulation under ambient conditions.
perovskite solar cellhole-transporting materialpower conversion efficiencycop-per phthalocyaninenickel phthalocyanine
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