As a pump for extracting carriers from the absorber to the cathode, holetransporting materials(HTMs) play indispensable roles in promoting the power conversion efficiencies(PCE) of perovskite solar cells(PSCs). In th...
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As a pump for extracting carriers from the absorber to the cathode, hole transporting materials(HTMs) play indispensable roles in promoting the power conversion efficiencies(PCE) of perovskite solar cells(PSCs). In this context, we present two simple HTMs using 2,2’-(1,2-phenylene) bisthiophene or naphtho[1,2-b:4,3-b’]dithiophene as a π-bridge to link two electron-donor units(4’,4’’-dimethoxytriphenylamine): PBT and NDT. Their frontier molecular orbital energies match well with those of perovskites as is consistent with the DFT calculation *** PCE measured under mimetic solar illumination(AM 1.5, 100 mW/cm) increases from 13.6%(PBT) to 18.8%(NDT), which surpass that of the spiro-OMeT AD(18.1%)reference. The modified annulated core in NDT makes it perform better in photovoltaic conversion than PBT. The reason for this is discussed from aspects of hole mobility, charge collection probability(Pc) and recombination kinetics.
Porphyrins and their derivatives have been extensive studied as photosensitizers in DSSCs and donor materials in bulk heterojunction organic solar cells(BHJ OSC) because of their excellent thermal stability,efficient ...
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Porphyrins and their derivatives have been extensive studied as photosensitizers in DSSCs and donor materials in bulk heterojunction organic solar cells(BHJ OSC) because of their excellent thermal stability,efficient light-harvesting ability,and high susceptibility in electron-transfer ***,we first reported the use of acceptor-donor-acceptor(A-D-A) structural porphyrin small molecules as donor materials in organic solar cells that facilitates delocalized π-conjugation and π-stacking in the solid state,and the large planar π-conjugation macrocycles can ensures high carrier mobility and efficient intermolecular charge transfer in the π-stacking direction.[1,2] The structural engineering with either different peripheral substitutions or various aromatic linkers on porphyrin core,can simultaneously facilitate better solubility,stronger intermolecular π-π stacking and higher charge transfer mobility in film,leading to the highest PCE of 9.50% in the conventional ***,our recent work demonstrated that the symmetrical meso-aryl substituted porphyrins can applied as hole transport materials(HTMs) in organic-inorganic hybrid perovskites solar cells(PSCs).For their suitable energy level,efficient exciton dissociation and charge transfer in HTM/perovskite films,the best power conversion efficiency of 17.78%(JSC = 22.68 mA cm,VOC = 1.099 V,FF = 71.3%) has been achieved for the zinc(II) porphyrin *** represents the highest PCE among those ever reported for porphyrin-and phthalocyanine-based HTMs in PSCs.
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