Enhanced Device Efficiency of Bilayered Inverted Organic Solar Cells Based on Photocurable P3HTs with a Light‐Harvesting ZnO Nanorod Array

Periodically patterned zinc oxide nanorod (P-ZnO NR) layers are directly prepared from a pre-patterned ZnO seed layer using a polydimethylsiloxane (PDMS) elastomeric stamp and then applied in inverted organic photovoltaic devices (IOPVs). The IOPV is assembled with a hydrothermally grown zinc oxide nanorod patterns with a (100) preferential crystal orientation as an electron transport buffer layer (ETBL) and photoactive bilayer consisting of methacylate end-functionalized poly(3-hexylthiophene) (P3HT-MA), phenyl-C60-butyric acid methyl ester (PC60BM) and indene-C60 bis-adduct (IC60BA). In te IOPVs, the P-ZnO NR is found to induce efficient light harvesting and the photocrosslinkable P3HTs afford solution-processed bilayer architecture in IOPVs to show improved device stability and performance (PCEmax= 5.95%), as the bilayered structure allowed direct exciton splitting, thus reducing the charge recombination.

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