Abstract
Significant performance change has been observed for inverted polymer solar cells (PSCs) with the structure of ITO/ZnO/P3HT:PC61BM/MoO3/Ag when the photoactive layer was rinsed by spin-coating alcohol solvent before the deposition of MoO3 and Ag anode. As a result, isopropanol (IPA) treatment can dramatically enhance the device performance of inverted PSCs while methanol, ethanol, and 1-butanol treatment led to worse photovoltaic performance. The enhancing device performance should be attributed to the remove of PC61BM near the top of the P3HT:PC61BM active layer by spin-coating IPA due to better wetting with the photoactive layer, resulting in the power conversion efficiency (PCE) and short-circuit current (Jsc) increased from 3.96% and 8.97 mA/cm2 to 4.49% and 9.92 mA/cm2 for IPA treatment, respectively. This facile alcohol-treated route provides a promising method to enhance the device performance of inverted PSCs.
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