▎ 摘　　要

Adding 6 wt% of graphene oxide (GO) into iodide-triiodide (I-/I-3(-)) electrolyte improved dye sensitized solar cell (DSSC) performance by a factor of 100% (from 3.5% to 7.0%) by achieving effective hole transport. Performance of DSSCs was suppressed by a factor of 17% (from 3.5% to 2.9%) due to the GO more than 6 wt%. GO improved the hole transport for an optimum concentration in the I-/I-3(-) while impeded the same for higher concentration due to the reduction in diffusivity. The presented work established a simple and straight forward approach to improve the performance of DSSCs by improving hole transport. (c) 2020 Elsevier B.V. All rights reserved.