Effect of stabilizer on optical band gap of ZnO and their performance in dye-sensitized solar cells

Abstract

ABSTRACT. In dye-sensitized solar cells, transparent metal oxide working electrodes play a vital role in defining the power conversion efficiency. It was found that the size of nanoparticles influences the electrical, optical properties of these electrodes. Herein, we describe the synthesis of ZnO with zinc acetate dihydrate and different stabilizers (diethylamine and triethylamine) by using a modified solvothermal process. The obtained materials were characterized by XRD, SEM, EDX, TEM, HRTEM, UV-visible, FTIR, and Raman methods. The crystallite sizes for ZnO-1 and ZnO-2 samples were indexed as 39.0 and 40.5 nm for the highest peak intensity with diethylamine and triethylamine stabilizer, respectively. We examine the effect of stabilizers on the morphology, optical band gap, and photovoltaic performance of the prepared ZnO. We found that ZnO prepared using diethylamine stabilizer exhibiting significant efficiency of 1.45%, open-circuit voltage 0.454 V, short-circuit current density 2.128 mA/cm²_, and 0.66 fill factor were achieved under 44 mW/cm² illumination powers with dye-3.

KEY WORDS: Dye-sensitized solar cells, ZnO, Band gap, Photovoltaic performance

Bull. Chem. Soc. Ethiop. 2022, 36(1), 209-222.                                                       

DOI: https://dx.doi.org/10.4314/bcse.v36i1.17