Abstract
Among the vast number of floras, Canna lily Red (CR) and Canna lily Yellow (CY) flower extracts were used as photosensitizers for natural dye-sensitized solar cells (NDSSC) with ZnO photoanode material. This study incorporates a blocking or compact layer (CL) below the nanoporous ZnO semiconducting metal oxide to reduce the device's recombination rate. A noticeable increment of J SC after adding a compact layer is observed for both the dyes; that is for CR dye from 0.43 to 0.47 mA/cm 2 , and for CY dye, 0.38 to 0.44 mA/cm 2 is obtained with a consistent high V OC of 0.54 to 0.60 V. Moreover, the device's charge collection efficiency has been enhanced from ∼ 93 to ∼ 97 % for CR dye and from ∼ 89 to ∼ 96 % for CY dye-loaded films after adding a compact layer. The enhancement in J SC , V OC , and fill factor ( FF ) is credited to increased electron lifetime, increased diffusion length, reduced series resistance ( Rs ), and exclusively enhanced recombination resistance among the FTO/electrolyte interface due to the compact layer. Despite visible defect states in the ZnO photoanode, a consistent photovoltage of 0.54 V to 0.6 V significantly manifests enhanced photovoltage production of Canna dyes in the device. The effect of compact layers on photovoltaic parameters is well established through the EIS study. • Canna dyes utilized as photosensitizers with ZnO photoanode in DSSC. • The rate of recombination and back transfer of charge carriers was reduced. • V OC and J SC are tunable with electrochemical impedance spectroscopy. • Photovoltage of 0.55V - 0.6V production is the iconic feature of these canna dyes.
Published Version
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