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Currently, the p-doping process, achieved by the ingress and diffusion of oxygen into the hole transporting layer, is time intensive (several hours to a day), making commercial mass production of perovskite solar cells impractical. The Tandon team, led by André D. Taylor, a professor of chemical and biomolecular engineering at NYU Tandon, and Jaemin Kong, a post-doctoral associate, discovered a method of vastly increasing the speed of this key step through the use of carbon dioxide (CO2) instead of oxygen. The research, “CO2 doping of organic interlayers for perovskite solar cells,” appears in Background. In perovskite solar cells, doped organic semiconductors are normally required as charge-extraction interlayers situated between the photoactive perovskite layer and the electrodes. The conventional means of doping these interlayers involves the addition of lithium bis(trifluoromethane)sulfonimide (LiTFSI), a lithium salt, to spiro-OMeTAD, a π-conjugated organic semiconductor

South koreaKwangju gwangyoksiJaemin kongYale universityNanomaterials at brookhaven national laboratoryGwangju institute of scienceCity universityTandon school of engineeringNational research foundation of koreaWonkwang universityChina scholarship councilKorea research institute of chemical technologyUs department of energy centerUs national science foundationKorea research instituteChemical technology