Abstract
Charge extraction ability in inverted polymer solar cells (IPSCs) can be enhanced using thermally evaporated compact Ta2O5 as cathode buffer layer (CBL) deposited onto indium tin oxide (ITO) substrate by varying the substrate temperature from 200 °C to 250 °C. The deposited polycrystalline films exhibit granular morphology with high optical transmittance around 500 nm and significant variation in defects with respect to ITO substrate temperature. Current density–voltage measurements show improvement in power conversion efficiency from 2.8% to 3.1% with ratio/percentage enhancement of 10.7% when substrate temperature is increased from 200 °C to 250 °C.
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