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Preparation of the Spiro-OMeTAD films and gold electrode
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The Spiro-OMeTAD solution was first prepared by dissolving 72.3 mg of Spiro-OMeTAD, 17.5 μL of a stock solution of 520 mg mL−1 LiTFSI/acetonitrile, and 28.8 μL of tBP in 1 mL of chlorobenzene. Then the Spiro-OMeTAD precursor was spin-coated at 3000 rpm for 30 s (accelerated speed 6000 rpm s–1) in an N2 glove box. Finally, 100 -nm-thick gold was thermally evaporated as a counterelectrode under a pressure of 1 × 10−4 Pa on top of the Spiro-OMeTAD films to form the back contact by using a shadow mask to pattern the electrode.
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