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. 2015 May 18;5:9863. doi: 10.1038/srep09863

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(a) UPS spectra of perovskite, n-type doped spiro-OMETAD (DMC vapor pressure ~10^–5 Torr), undoped intrinsic spiro-OMeTAD, and p-type doped spiro-OMeTAD (F4-TCNQ ~2 wt.%). (b) Energy level alignment diagram extracted from the UPS results.