Abstract
To improve the power conversion efficiency (PCE) of polymer solar devices, we introduced a highly crystalline nanocrystal titanium oxide layer (nc-TiO2 layer) that was formed by spin-coating a dispersed liquid of precrystallized titanium oxide nanoparticles. The nc-TiO2 layer can be formed more easily and with a higher reproducibility than the TiOx layer formed by a conventional low-temperature sol–gel method. By inserting the nc-TiO2 layer, the PCE was significantly improved from 2.70 to 3.91%. The nc-TiO2 layer enabled a larger decrease in internal resistance than the TiOx layer; thus, the nc-TiO2 layer acts as an effective hole-blocking layer and optical spacer.
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