Tetraaryldiamine-based electron-transporting interlayers for performance and stability enhancement of organic solar cells

다국어 초록 (Multilingual Abstract)

Three novel tetraaryldiamines are synthesized and applied as an interlayer between zinc oxide (ZnO) andphotoactive layers in PTB7-Th:PC71BM solar cells. The arylamines have an optical bandgap of 3.0–3.4 eVand do not interfere with the light-harvesting window of our polymer:fullerene combination. Theyenhance the power conversion efficiency from 7.48% in the control device to 8.95%, 8.18%, and 7.84%in PN-, PA-, and PAP-based devices, respectively. The dependence of photovoltaic parameters on thedeposition conditions of the interlayer reveals that the current density and fill factor are the main parametersthat increase when tetraaryldiamines are used as an interlayer. The external quantum efficiencyincreases from 73.1% in the bare ZnO device to 77.7–82.0% in the interlayer-incorporated devices. Thepower loss owing to the series and shunt resistances is reduced by a suitable alignment of the electronicenergy levels with the interlayer and enhanced charge transfer through the components. Interlayerincorporateddevices also show a superior environmental stability compared to devices using bareZnO. The results of this study should help advance the engineering strategies for organic solar cells withenhanced performances.

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